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How large is a xylem vessel? Let’s hear it!
Non-invasive and early monitoring of drought-stress in crop plants is helpful not only for precise irrigation plans, but also it can provide a wealth of novel physiological insight into plant dynamics. Several plant physiologists have reported on broadband ultrasonic emission (UE) from drought-stres ...
Supervisor: Dr. Elias Kaiser (WUR): elias.kaiser@wur.nl, Dr. Satadal Dutta (TU Delft) : s.dutta-1@tudelft.nl, Dr. Gerard J. Verbiest (TU Delft): G.J.Verbiest@tudelft.nl
 
Photosynthesis, respiration and stomatal characteristics under low light conditions in green vegetables
In fresh cut lettuce and other green vegetables stored at low temperature and low light intensity, there is significant sugar accumulation, this greatly improves the shelf life. At low temperature, very low light levels can already lead to photosynthetic sugar production. Light may also stimulate st ...
Supervisor: Prof. Dr. Ernst Woltering (also FBR), Dr. Rob Schouten and Dr. Wim van Ieperen
 
BSc-thesis (literature study): Quality improvement of cut monocot flowers
Many monocot flowers (e.g. ginger, tulipa, iris) have a short vase life. The flower senescence in these flowers is not regulated by ethylene, so available solutions to block ethylene (STS, 1-MCP) generally have no impact in these flowers. In addition, in monocot flowers there is no problem with vas ...
Supervisor: Prof. dr. Ernst Woltering (FBR)
 
Improving homogeneity in cut chrysanthemum production
Chrysanthemum is one of the most important horticultural ornamental crops worldwide. Much research has been done on the response of chrysanthemum to environmental factors such as temperature, light, and their interaction. This research is being used to optimize chrysanthemum production. However, ...
Supervisor: Dr. Jochem Evers (CSA – Crop System Analysis) – Dr. Ep Heuvelink (HPP)
 
Effects of light quality on plant water relations, leaf development and stem elongation
Several topics can be studied within the framework of a PhD project on the effects of light quality on plant water relations, and 2 postdoc projects, one on the effect of light quality on leaf development, and one on the effect of light quality on stem elongation. These projects are of fundament s ...
Supervisor: Dr. Wim van Ieperen & PhD student or Postdoc
 
Impact of silicon on tomato and cucumber growth and defense
Tomato and cucumber are two major crops of horticultural systems in The Netherlands. These crops are typically grown on mineral wool in order to avoid soil-borne diseases as well as to enable efficient fertilizer management. However, also plants grown on mineral wool still need to defend the plant t ...
Supervisor: Dr Ep Heuvelink and Prof. dr ir. Gerlinde De Deyn
 
PlasmaPonics: the effects of plasmawater on plant cultivation
Plant nitrogen supply is an important cultivation factor. Suboptimal N fertilization in terms of dose, timing, and form can decrease crop commercial value, impact the environment and reduce crop health benefits for humans. The Haber-Bosch N fixation process of BASF is a landmark in industrial histor ...
Supervisor: Dr ir Sander van Delden (daily supervisor)
 
Long-term storage of roses: its effect on xylem hydraulic conductance
We recently found that following long-term cold storage the stomata are less functional. It means that the flowers rapidly develop a negative water balance when placed in the vase (transpiration exceeds the uptake). Later during the vase life, the stomata become functional again, probably due to the ...
Supervisor: prof Ernst Woltering, Dr Bastiaan Brouwer (FBR)
 
How is fruit set affected by different temperature integration regimes?
Fruit set is a temperature and light sensitive process that depends largely on the balance between source and sink strength. Previous research has shown that plants are flexible to day to day and long term fluctuations in temperature and light, however this research has been done mainly on vegetati ...
Supervisor: Cristina Zepeda (PhD Candidate), Dr. Ep Heuvelink
 
Using seedlings to predict photosynthetic induction in mature plants?
Plants in nature or greenhouses are often exposed to rapidly changing light intensities, which has major impacts on these plants’ photosynthesis rate. The rapidity with which a plant can respond to a change in light intensity is often measured using photosynthetic induction: a plant initially expose ...
Supervisor: Dr. Elias Kaiser
 
Roles of strawberry fruit quality attributes in defending against Botrytis cinerea during postharvest
Strawberry is a popular fruit; the flavour and taste are highly appreciated by consumers. During fruit development, maturation, and shelf-life changes in size, shape, colour, shininess and firmness are most noticeable. Softening, an increase in soluble content, the biosynthesis of secondary metaboli ...
Supervisor: Hua Li (PhD candidate) and Dr. Rob Schouten, Prof.dr. Ernst Woltering, Prof.dr. Leo Marcelis
 
Exploring the interactive effects of temperature and CO2 on dynamic photosynthesis
Climate models predict future concurrent increases of temperature and CO2 concentration. Increased temperature and CO2 affect many plant physiological processes, including photosynthesis. Most T and FACE, increased temperature and free air CO2 enrichment, experiments focus on steady state photosynth ...
Supervisor: Dr. Ningyi Zhang, Dr. Elias Kaiser
 
New fertilization concepts for improved nitrogen use efficiency in horticultural systems
Nitrogen (N) is an essential element for crop growth, development and subsequently product quality. Roughly 1 to 5% of total plant dry matter consists of N, which is an integral constituent of proteins, (co-)enzymes, nucleic acids, chlorophyll, phytohormones and secondary metabolites. Therefore plan ...
Supervisor: Dr ir Sander van Delden (daily supervisor)
 
The use of short term LED lighting before harvest to improve quality of Lettuce
In recent years, vertical farming (plant factory) has been fast developed and the its concept has been spread worldwide. Lettuce, as one of the major crop grown in vertical farming has become a model plant in experimental research. Lettuce is a perishable leafy vegetable that generally has a short s ...
Supervisor: Qianxixi Min, Prof. Dr. Ernst Woltering
 
Is Far-Red driving the circadian clock for photoperiodic time keeping in Chrysanthemum flowering
In a recent study we observed that flowering in short-day plant (SDP) chrysanthemum can be induced during longday (15h) provided with 11hours of red-blue(RB) spectrum and extended with 4hours of blue (B) spectrum. However, RB spectrum added with far-red (FR) spectrum with extended 4hours of B spectr ...
Supervisor: Sharath Malleshaiah and Wim van Ieperen
 
New fertilization concepts for improved nitrogen use efficiency in horticultural systems
Nitrogen (N) is an essential element for crop growth, development and subsequently product quality. Roughly 1 to 5% of total plant dry matter consists of N, which is an integral constituent of proteins, (co-)enzymes, nucleic acids, chlorophyll, phytohormones and secondary metabolites. Therefore plan ...
Supervisor: Dr ir Sander van Delden (daily supervisor)
 
Water stress and light quality: Coordination of Leaf hydraulic conductance and stomatal conductance at different light qualities (i.e. under LEDs and Sun-light)
When leaves adapt to environmental conditions they apparently show coordinated responses with respect to photosynthesis and water relations. This requires some kind of internal organisation, which might possibly be under the control of an environmental factor. Recently we showed that the conductance ...
Supervisor: Dr. Wim van Ieperen
 
Role of photoreceptors (PhyA, PhyB and Cry1&2) in flowering of Chrysanthemum via PCR gene expression studies
We recently found out that flowering in the short-day (SD) plant Chrysanthemum can be induced during long-days when light quality is adjusted to pure blue light during the last hours of the (long) day-period. However, the success of this strategy also seems to depend on the spectral composition of t ...
Supervisor: Sharath Malleshaiah, Dr. Wim van Ieperen
 
Analysis of realistic ‘genotype by environment’ interactions simulated using a crop growth model with a large number of physiological parameters
A different response of genotypes across environments is frequent in multi-location trials and is known as genotype by environment interaction (GxE). The study and understanding of these interactions is a major challenge for breeders and agronomic researchers. To better understand the GxE a simulat ...
Supervisor: Dr. Ep Heuvelink and Prof.Dr. Fred van Eeuwijk (WUR Biometris)
 
Monitoring leaf physiology in response to drought-stress
Physio-chemical processes in plants are very sensitive to water-status. Slight reduction in leaf water content, for instance, can inhibit CO2 uptake and growth. Farmers lack easy-to-use and reliable sensors for plant water-status. It is known that the reflectance of light at specific wavelengths can ...
Supervisor: Dr. Elias Kaiser (WUR): elias.kaiser@wur.nl, Dr. Satadal Dutta (TU Delft) : s.dutta-1@tudelft.nl, Dr. Gerard J. Verbiest (TU Delft): G.J.Verbiest@tudelft.nl
 
Understanding and predicting the Phenotype of Phalaenopsis Orchids in different environments
Phalaenopsis is one of the most economically important ornamental crops. Selection of new varieties is often done by manual assessment of colour, shape and number of flowers. Important cultivation characteristics, such as growth duration and responses to the greenhouse climate are not taken into acc ...
Supervisor: Evelien van Tongerlo (PhD-student), Dr. Wim van Ieperen
 
Avoiding the development of bitter taste in papaya
As part of a running project on papaya quality, we are interested in measuring the bitter flavour in papaya fruit flesh, what causes it and how it spreads through the papaya. Ways of assessing the bitter flavour range from lab work to the use of highly specialized equipment. The ultimate goal of ...
Supervisor: Prof. Dr. E. J. Woltering (FBR/HPP) and Dr. Ir. Bastiaan Brouwer (Agrotechnology & Food Sciences Group)
 
Thermal imaging for high throughput stomata phenotyping in tomato
The capability to non-destructively capture plant traits is a key advance in high-throughput phenotyping. Stomatal regulation is an important indicator of plant photosynthesis and water relations. Stomatal responses to light is of critical importance and rapidly captured responses will provide insig ...
Supervisor: Prof. Dr. Leo Marcelis
 
Vase life of cut flowers
• Investigate the influence of preharvest conditions on postharvest quality, vase life. RH during preharvest has effect on quality (vase life). Stomata malfunction is caused by high humidity during preharvest, and is possibly genotype dependent. Bouvardia, Chrysanthemum, topics available. • Transpo ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
Chilling injury in Tomato
Tomato, as a (sub-) tropical fruit suffers from chilling injury (CI). CI occurs before or after harvest, in the field, during transport, storage and marketing. Symptoms are numerous, and include tissue browning, pitting and discoloration of the skin, uneven ripening, and increased disease susceptibi ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
Tomato Lycopene Bioavailability
A very red tomato contains more lycopene than a light red tomato. However, the bioavailability (how much gets absorbed in your body) of lycopene, an important health-promoting compound, might be the same. Manipulation of tomatoes by postharvest cold and light treatments. We hypothesize that if we c ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
[Project together with Dr. Edoardo Capuano - FQD (Food Quality and Design)]
 
LEDs grow Quality: Light conditions and the effect on quality related compounds
• Investigate the regulation and biosynthesis of specific classes of agronomically important secondary metabolites in species that are valued for their production of such compounds. We will grow plants under different light conditions to modulate these specific chemical pathways. • Glucosinolates ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
Quality of processed lettuce, cucumber and tomato: what is translucency?
Translucency (glassiness) is a serious problem in processed products, but up till now we don’t understand the mechanism that leads to glassiness. We have found a number of clues, though. We can for instance transfer the glassiness that often happens in cut tomato to cut cucumber (that never shows th ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
CRISPR-Cas9 projects
• We have projects to design and test CRISPR-Cas9 approaches for the species below. It is the goal to test the constructs in transient expression systems like Nicotiana benthamiana, Tobacco or Petunia. • The target gene will also be tested, for example during ripening, or growth conditions, using  ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
Strawberry pre- and post-harvest projects
• We have projects to study the effect of preharvest conditions on postharvest quality, shelf life and flavour life. • We have projects to study the link between strawberry colour, proanthocyanidin content and Botrytis incidence. • We would like to identify genes and gene products that are involve ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
Petunia scent and colour: Manipulate scent and/or colour in Petunia
• Investigate the biosynthetic pathway and regulatory elements of scent and colour production. Manipulate gene expression through overexpression, silencing or CRISPR-cas9 • Change the smell of petunia flowers. Introduce genes that produce volatiles that are not present in the headspace of wild type ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
Marigold regulation of Carotenoid biosynthesis
• Manipulate biosynthesis pathway in Marigold to change composition of carotenoids. Change colour or health benefits (Vitamin A). • Golden Marigold. Introduce the golden rice construct to see the effects on marigold flowers. • Study regulatory network of carotenoid biosynthesis. Investigate trans ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
Tomato carotenoid manipulation
• Tomato has a huge pool of lycopene; can this be used to produce lycopene breakdown products like lutein and or Astaxanthin? These compounds are highly valuable pigments and strong antioxidants. • Manipulate biosynthesis pathway in tomato to change composition of carotenoids. Change colour or heal ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
Tomato Stay Green projects
• During tomato ripening, chlorophyll breakdown and lycopene biosynthesis coincide and are regulated by a Stay Green Protein (SGP). But not only colour, also firmness is regulated by this amazing protein family! This means that SGP are vital to tomato quality attributes such as colour and firmness b ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
Mango projects
• Mangoes hardly ripens on tree, but quickly ripens after harvest. We want to identify the 'tree factor' compound in e.g. the milky white sap from the harvest wound. Also, we want to investigate the effect of e.g. removing leaves from mango branches in a Spanish orchard. • Study the production of m ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
Interactions of Fe concentrations, root development, growing medium and irrigation strategy
This experiment is part of a project which aims to develop a prototype of a dynamic model for monitoring and surveillance of nutrient concentrations in substrate systems. This model will be based on relevant parameters related to crop and cropping system, and dynamic changes during cultivation. Expe ...
Supervisor: Wim Voogt (WUR Plant Sciences, Bleiswijk), Ep Heuvelink
 
Photosynthetic induction at high CO2 quantifying the dipping effect
Irradiance frequently fluctuates under natural conditions and in greenhouses. When light intensity suddenly increases, leaf photosynthesis progressively increases rather than instantaneously increasing to the steady state level, a process termed photosynthetic induction. The main limiting processes  ...
Supervisor: Dr. Ningyi Zhang, Dr. Elias Kaiser
 
Anthocyanin Discolouration in Purple Pepper Fruits
Anthocyanins, plant secondary metabolism, are suggested to have health-promoting effects for human. They also facilitate plant reproduction and protect plants from various biotic and abiotic stresses. In pepper (Capsicum. Spp.), there are many purple-fruited genotypes, whose purple colour is imparte ...
Supervisor: Ying Liu (PhD candidate) and Dr. Rob Schouten, Prof.dr. Leo Marcelis (HPP) and Dr. Arnaud Bovy (Plant Breeding)
 
How high temperature delays photoperiodic floral induction in Chrysanthemum
Chrysanthemums are one of the most valuable ornamental commodity of floriculture sector to use as cut flowers and potted plants owing to their colourful ‘capitulum’. Production of this ornamental beauties is quite challenging due to their largely depend on day length (photoperiod) and temperature.  ...
Supervisor: Sharath Malleshaiah and Ep Heuvelink
 
Sucrose as a Florigen for floral induction in Chrysanthemum
Sugars are involved in diverse physiological functions and their roles in signal transduction in plants have become apparent, disaccharides like sucrose molecules mediate plant responses to stresses, growth and development. Sugar signalling in plants is crucial to distribute available energy and re ...
Supervisor: Sharath Malleshaiah and Dr. Wim van Ieperen
 
Nutrient solutions for the cultivation of Arabidopsis
In WUR we grow huge numbers of arabidopsis plants for research purposes. For this we use a standard recipe of a hydroponic nutrient solution often with rockwool as a substrate. It is not at all certain, however, that this standard recipe and method is optimal, and some evidence points to it being, i ...
Supervisor: Dr Sander van Delden
 
Medical cannabis
The global market for medical cannabis is rapidly growing and some countries have now also legalised the recreational use of cannabis. Multiple medical benefits for cannabis have been described (Hill et al. 2015; Whiting et al 2015). The major compounds of medical interest are cannaboids. The plant  ...
Supervisor: Prof. dr. Leo Marcelis
 
Dancing without a beat the diurnal rhythms of photosynthesis
Like most organisms, plants have an internal clock that regulates processes on a 24 hour schedule. This includes processes connected to photosynthesis, such as diurnal CO2 uptake, stomatal conductance, chlorophyll fluorescence, protein turnover, and many more. When a plant that has been growing unde ...
Supervisor: Dr. Elias Kaiser
 
Exploring the gap in mineral balances of greenhouse crops, with special focus on Na
This experiment is part of a project framework dealing with salinity, in particular Na accumulation, in soilless grown greenhouse crops. In a series of trials in the last five years, where we focussed on the effects of Na accumulation on growth, development, yield and quality of greenhouse crops. F ...
Supervisor: Wim Voogt (WUR Plant Sciences, Bleiswijk), Ep Heuvelink (HPP WUR)
 
Predicting plant N demand
Plant nitrogen supply is an important cultivation factor. Suboptimal N fertilization in terms of dose, timing, and form can decrease crop commercial value, impact the environment and reduce crop health benefits for humans. Therefore optimal N fertilization in horticultural systems by continuously mo ...
Supervisor: Dr ir Sander van Delden (daily supervisor)
 
Lettuce growth model 2.0 – Investigating the limits of crop productivity
The expansion of the urban population has resulted in an ever increasing interest in urban food production. Urban farming is considered a promising development in the light of societal challenges regarding food security and urbanization, and sustainable crop production (FAO 2011, Colding & Barthe 20 ...
Supervisor: Dr. ir. Ep Heuvelink (HPP-Plant Sciences), Dr. Cecilia Stanghellini and Ilias Tsafaras (Greenhouse Horticulture)
 
Photosynthetic induction at low temperature – what’s up with the hiccups?
In nature, leaves are often exposed to fluctuations in light intensities. These fluctuations have a negative effect on leaf photosynthetic rates, partly due to the low speed at which photosynthesis responds to changes in light. The slow increase in photosynthesis after a stepwise increase in light i ...
Supervisor: Dr. Elias Kaiser
 
Exploring stomatal limitations under fluctuating light, using epf mutants
In nature, leaves are often exposed to fluctuations in light intensity. These fluctuations directly impact on photosynthesis rates, as they cannot react instantaneously. One of the major limitations of photosynthesis in fluctuating light intensities is stomatal conductance, i.e. the capacity for CO2 ...
Supervisor: Dr. Elias Kaiser
 
Viability of broad-spectrum LED lighting in greenhouse tomato
Vine crops, specifically tomatoes, represent one of the largest segments for electric lighting in horticultural applications. Furthermore, cultivators are constrained by inadequate lighting conditions during winter months and high operating costs for traditional lighting systems. LED lighting sy ...
Supervisor: Dr. Ep Heuvelink
 
Long-term storage of roses: physiological/biochemical basis of leaf quality problems
Following long term storage, many rose cultivars (but not all) show leaf quality problems during the vase life. Leaves rapidly develop black lesions that later turn brown and may lead to complete leaf dehydration and abscission. The cause of this phenomenon is not known. It is vastly unpredictable a ...
Supervisor: Prof. Dr. E. J. Woltering (also FBR) and Dr. Ir. Bastiaan Brouwer (FBR - Fresh Food & Chains )
 
MSc-thesis or Internship: Controlling flowering and morphology of Lily cut flowers with light
Plant Lighting B.V. (Bunnik, the Netherlands) is looking for a student to participate in a research project starting in October 2019. Both MSc-thesis or internship is possible. The project is about controlling flowering and morphology (length, leaf orientation) of cut Lily flowers. Being a quant ...
Supervisor: Supervisor HPP: Wim van Ieperen
External supervisor: Sander Hogewoning (info@plantlighting.nl)
 
Does photosynthetic induction acclimate to high CO2?
It is well known that steady-state photosynthetic rate increases with an increase of CO2 partial pressure. Interestingly, elevated CO2 increases photosynthesis even more strongly under fluctuating light. Under greenhouse conditions, supplementary CO2 is frequently applied, which increases the CO2 co ...
Supervisor: Dr. Ningyi Zhang, Dr. Elias Kaiser
 
Exploring the acclimation of leaf anatomical traits to high CO2 and their relevance to photosynthetic induction under fluctuating light
Greenhouse crops are frequently grown under high CO2 concentrations due to the application of supplementary CO2. Leaves developed under high CO2 could differ in their anatomical traits compared with leaves developed under normal CO2 concentrations. For example, leaves developed at high CO2 often sho ...
Supervisor: Dr. Ningyi Zhang, Dr. Elias Kaiser
 
Does light spectrum influence fruit set in sweet pepper?
Fruit set indicates the initiation of fruit growth derived from flowers, and the cessation of this process is termed as abortion. Fruit set or abortion is a crucial development process in the plant life cycle, and it is also a main determinant of crop yield. In sweet pepper, up to 80% of all flowers ...
Supervisor: Sijia Chen (PhD candidate) and Dr. Ep Heuvelink
 
Predicting plant N demand
Plant nitrogen supply is an important cultivation factor. Suboptimal N fertilization in terms of dose, timing, and form can decrease crop commercial value, impact the environment and reduce crop health benefits for humans. Therefore optimal N fertilization in horticultural systems by continuously mo ...
Supervisor: Dr ir Sander van Delden (daily supervisor)
 
Analysis of germination curves: evaluation of best practices
The germination of seeds is a topic that has received much attention in Plant Sciences. New insights in the way to analyse germination data, led to different statistical analysis methods, based on survival analysis and right- and interval-censored data. This new approach might have profound practica ...
Supervisor: Dr ir Gerrit Gort (MAT) and Dr ir Sander van Delden (HPP)
 
Temperature and light integration on young tomato plants
Precise control of indoor climate in greenhouses ensures steady crop production and allows higher yield largely independent of outside temperatures. This rigid climate set points require high energy inputs. There is an increasing interest in reducing CO2 emissions. We can achieve this through flexib ...
Supervisor: Cristina Zepeda (PhD Candidate), Dr. Ep Heuvelink
 
Floral induction in ornamental short-day plants under long-day photoperiod with LEDs
At higher latitudes, in winter short day lengths combined with low light intensities result in low daily light integral that limits the greenhouse production of ornamentals (cut flowers and potted plants). Therefore, supplemental light is needed to produce better quality and higher yield (more stems ...
Supervisor: Sharath Malleshaiah and Ep Heuvelink
 
Impact of Coronavirus (COVID-19) Pandemic on the Ornamental Horticulture Industry
The impact of the coronavirus crisis is being felt across all sectors of society. Also the ornamental sector has been significantly affected and we are yet to see what the full impact will be. Although still early into the crisis for many countries the timing is critical. Starting from February t ...
Supervisor: Sharath Malleshaiah, dr. Ep Heuvelink and dr. Jaap Sok (Business Economics)
 
Vegetative growth and climate fluctuations: the role of a dynamic assimilate pool
Precise control of indoor climate in greenhouses ensures steady crop production and allows higher yield largely independent of outside temperatures. This rigid climate set points require high energy inputs. There is an increasing interest in reducing CO2 emissions. We can achieve this through flexib ...
Supervisor: Cristina Zepeda (PhD Candidate), Dr. Ep Heuvelink
 
How large is a xylem vessel Let s hear it
Non invasive and early monitoring of drought stress in crop plants is helpful not only for precise irrigation plans, but also it can provide a wealth of novel physiological insight into plant dynamics. Several plant physiologists have reported on broadband ultrasonic emission (UE) from drought stres ...
Supervisor: Dr. Elias Kaiser, Dr. Satadal Dutta, Dr. Gerard J. Verbiest
 
Source sink ratio and negative feedback of low sink strength on crop photosynthesis
Light is the most important growth factor determining crop yield in greenhouses. In northern regions including The Netherlands, low light levels limit photosynthesis and consequently growth during a large part of the year. On the other hand in summer time there are periods with too high intensities, ...
Supervisor: Dr. Ep Heuvelink and Prof. Dr. Leo Marcelis
 
Unraveling Environmental Effects on Excess Light Energy Dissipation in CAM Photosynthesis of Orchids
Phalaenopsis is an economically important ornamental crop in the Netherlands, which employs Crassulacean Acid Metabolism (CAM) photosynthesis as a basic source for CO2 assimilation and growth. Phalaenopsis is an epiphyte which a natural habitat in trees and relies on water taken up by aerial roots.  ...
Supervisor: Wim van Ieperen, Maarten Wassenaar
 
The light response of photosynthetic induction
Plants in nature or greenhouses are often exposed to rapidly changing light intensities, which has major impacts on these plants photosynthesis rate. The rapidity with which a plant can respond to a change in light intensity is often measured using photosynthetic induction, a plant initially exposed ...
Supervisor: Dr. Ningyi Zhang and Dr. Elias Kaiser
 
Desk study, How strongly is the light response of photosynthesis affected by a plant’s growing environment
It is often stated in published literature that a leaf s net photosynthesis rate saturates at a light intensity of 500 umol m 2 s 1, which is ca. 0.25 of full sunlight. However, this conclusion may be based on measurements using plants that had been grown in climate chambers, i.e. at far lower and s ...
Supervisor: Dr. Elias Kaiser
 
High light memory effects on stomatal conductance
On days with changing weather, light intensities change rapidly between periods with cloud cover and full sun. These periods could last from seconds to hours, depending on the weather. Previous research suggests that the xanthophyll cycle, a photoprotection mechanism, functions as a high light memor ...
Supervisor: Dr. Elias Kaiserm, Tom van den Berg
 
How LEDs affect strawberry plant growth, nutritional quality and postharvest shelf life?
Strawberry is a popular fruit; the flavour and taste are highly appreciated by consumers. During fruit development, maturation, and shelf life changes in size, shape, colour, shininess and firmness are most noticeable. Softening, an increase in soluble content, the biosynthesis of secondary metaboli ...
Supervisor: Hua Li (PhD candidate) and Dr. Rob Schouten, Prof.dr. Ernst Woltering, Prof.dr. Leo Marcelis
 
Internship: Experiment with LED lighting at a tomato company in Italy
HPP has a cooperation with a large innovative tomato grower in Italy. They want to install LEDs in a large new greenhouse. Before they start with the large scale lighting, they want to do experiments with LEDs this fall. There will be four different LED lighting treatments. They are looking for  ...
Supervisor: External supervisor: Matthias Scheuber
 
Introduction of research on bean sprouts physiology for Internship at Evers Specials
Evers Specials is the biggest mung bean sprouts producer in Europe. We specialize in growing mung bean sprouts and our market is mainly in Europe. Therefore, as main product, bean sprouts quality is utmost important for us. However, bean sprouts are relatively “small” vegetable from an economical po ...
Supervisor: External supervisors: Ruxin Hé (Evers Specials)
Contact HPP: Leo Marcelis
 
Internship: Post-harvest quality assessment of vegetables grown in a plant factory under different light conditions - Vertical farming traineeship proposal - Signify Research (Philips Lighting)
General information: Plant grown under fully control environment with LED lighting as sole source of light are subject to research focused on yield and post-harvest quality. It is demonstrated that production and quality of fruits and vegetables could be significantly enhanced. At Philips Lighting  ...
Supervisor: External supervisor: Dr. C.C.S. Nicole (Signify) - Contact HPP: Leo Marcelis
 
Internships at Ter Laak Orchids (location Wateringen)
Ter Laak Orchids is one of the leading nurseries of Phaleanopsis potplant in Europe. We are located in Wateringen, in the west of Holland in the Westland area. With our 140 employees, we grow yearly more than 6 million Phalaenopsis plants. We have 125,000 m2 production area spread over two modern, s ...
Supervisor: External supervisor: Ewald de Koning (Ter Laak Orchids) Contact HPP: Ep Heuvelink
 
Internship Crop Data Science
At this moment, Delphy has different simple grow and plan models available for cultivation, which support during the cultivation of crops. The current models are 'lacking' due to the fact that they are mainly based on light availability for a crop. The goal is to develop plant/growth models with  ...
Supervisor: External: Aad van den Berg (primary contact), Klaas van Egmond
HPP contact: Leo Marcelis
 
Internship: Maximize tomato production in high tech greenhouse in Querétaro, Mexico
In Querétaro an Agropark is located with 112 Ha of greenhouses. In total there are 12 companies in the Agropark. Finka is one of the companies present and it offers students to do their internship or thesis within the company. Finka has high technology greenhouses where tomato and cucumbers are prod ...
Supervisor: External supervisors: Marieke Vanthoor (United Farms Mexico)
Contact HPP: Ep Heuvelink
 
Internship: Interactions of Fe concentrations, root development, growing medium and irrigation strategy
This experiment is part of a project which aims to develop a prototype of a dynamic model for monitoring and surveillance of nutrient concentrations in substrate systems. This model will be based on relevant parameters related to crop and cropping system, and dynamic changes during cultivation. Expe ...
Supervisor: Wim Voogt (WUR Plant Sciences, Bleiswijk), Ep Heuvelink
 
Internship topics Post-harvest quality of fruits, flowers and vegetables: examples potted plants (other topics possible)
Potted plants (internships) • Transport conditions reduce quality. Possible topics to study is the effect of darkness, ethylene, cold and mechanic damage. Effect of growing conditions (preharvest) on quality. Petunia, Chrysanthemum topics available. In collaboration with Syngenta, Dümen Orange, et ...
Supervisor: Dr Rob Schouten, Dr Julian Verdonk
 
Internship Molecular Strawberry Breeding - Fresh Forward
Who we are Fresh Forward is a strawberry Breeding company Located in Eck en Wiel, Betuwe, The Netherlands. Our breeding program started in 1943 at one of the institutes of Wageningen University. Famous varieties derived from this program include Gorella, Korona, Elsanta, Sonata and Rumba. We curren ...
Supervisor: Dr. Thijs van Dijk (thijs.vandijk@fresh-forward.nl).
 
Greenhouse Horticulture Research Intern @ Microsoft Research (Redmond - USA)
Microsoft Research (MSR) provides a dynamic environment for research careers with a network of world-class research labs led by globally-recognized scientists and engineers. Our researchers and engineers pursue innovation in a range of scientific and technical disciplines, to help solve complex chal ...
Supervisor: Prof. Dr. Leo Marcelis
 
Internships ViVi - a fully controlled growing system for young plants and finished products
ViVi is a fully controlled growing system for young plants and finished product. ViVi is a patented system which produces 100% clean, 100% safe and 100% secure plants and produce. The ViCabin is a turnkey system in which everything the plant needs is controlled, both in the cabin and in the tray.  ...
Supervisor: External supervisor(s): Su Zhang (s.zhang@viscon.eu) ; Damian Lopez (d.lopezsalazar@viscon.eu)
 
Internship: Improving taste and smell of horticultural crops (herbs as mint, basil) - Vertical farming traineeship proposal - Signify Research (Philips Lighting)
General information: Plant grown under fully control environment with LED lighting as sole source of light are subject to research focused on yield and post-harvest quality. It is demonstrated that production and quality of fruits and vegetables could be significantly enhanced. At Philips Lighting  ...
Supervisor: External supervisor: Dr. C.C.S. Nicole (Signify) - Contact HPP: Leo Marcelis
 
Internships: Increasing yield of arugula grown in vertical farming using dynamic lighting - Vertical farming traineeship proposal - Signify Research (Philips Lighting)
General information: Plant grown under fully control environment with LED lighting as sole source of light are subject to research focused on yield and post-harvest quality. It is demonstrated that production and quality of fruits and vegetables could be significantly enhanced. At Philips Lighting  ...
Supervisor: Dr. C.C.S. Nicole (Signify) - Contact HPP: Leo Marcelis
 
Internship: research on crop production (including fruit bearing crops) in growth chambers at Certhon Innovation Centre (CIC)
Certhon is a family business that is building turnkey projects for the international horticulture business. We build advanced custom made greenhouses and indoor farms. All disciplines concerning the design and construction are in house. Among which greenhouse construction, cooling and heating, elect ...
Supervisor: External supervisor: Jeroen van Lent (www.certhon.com)
Contact HPP: Leo Marcelis
 
Internship or MSc-thesis: Controlling flowering and morphology of Lily cut flowers with light
Plant Lighting B.V. (Bunnik, the Netherlands) is looking for a student to participate in a research project starting in October 2019. Both MSc-thesis or internship is possible. The project is about controlling flowering and morphology (length, leaf orientation) of cut Lily flowers. Being a quant ...
Supervisor: External supervisor: Sander Hogewoning (info@plantlighting.nl)
Supervisor HPP: Wim van Ieperen
 
Internship in vertical farming, at INFARM (Berlin - Germany)
Possible topics: 1. How low can we go? Understanding light harvesting abilities of herbs and leafy greens. In order to optimize light use for photosynthesis in vertical farming we would like to explore the maximum light use of various herb and lettuce cultivars. Our objective is to determine the l ...
Supervisor: External supervisor(s) INFARM: Dr. Viviana Correa-Galvis, Pavlos Kalaitzoglou
Supervisor HPP: Dr. Elias Kaiser (1st contact for students)