Photosynthesis

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Measuring 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, ...


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Photosynthetic induction at high [CO2]: quantifying the “dip”

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 ...


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Desk study: Meta-analysis of photosynthesis dynamics – would you like to crunch data?

In nature, leaves are often exposed to fluctuations in light intensities, causing photosynthesis to respond at various time scales. While we are only starting to realize how ...


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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 ...


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Bag ‘Em: Cucumber fruit photosynthesis in interlight

As a driving factor for growth, photosynthesis research focusses mostly on the leaves of plants. However, assimilates can originate from foliar photosynthesis or from the fruit itself in proportion that varies between species (Cocaliadis et al., 2014; Simkin et al., 2020). For example, the surface area of a mature ...


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Monitoring leaf physiology in response to drought stress in intact plants

Physio-chemical processes in plants are very sensitive to water-status. Slight reductions 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 ...


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Various projects in the HPP - CSA photosynthesis lab

If you are interested in cutting-edge research on photosynthesis in plants (at leaf-plant scale) and related advanced measuring techniques for functional phenotyping on plants, and if you would like to work in an inspiring work environment where collaboration, ambition, scientific curiosity ...


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How does stomatal density affect stomatal opening and closure under dynamic light?

In nature, leaves are often exposed to fluctuations in light intensity. These fluctuations directly impact on photosynthesis rate and plant water use efficiency, as stomata and photosynthesis do not react instantaneously to changes in light. Also, stomatal conductance (the capacity for CO2 ...


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Effects of biochemical and stomatal acclimation on dynamic photosynthesis under high [CO2]

Greenhouse crops are frequently grown under high [CO2] due to the application of supplementary CO2. Net photosynthesis rate typically increases with an increase of [CO2]. However, plants that have developed ...


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Exploring the acclimation of leaf anatomical traits to high CO2 and their relevance to photosynthesis

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 ...


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Does position matter? Exploring photosynthetic characteristics of different leaflets in tomato

It is a mystery which leaflet to use when measuring photosynthesis on a compound leaf, such as in tomato. Are the photosynthetic characteristics of all leaflets representative of the complete leaf? The applied ...


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NIR sensing of leaf carbohydrate concentration

As a result of photosynthesis, leaves produce carbohydrates (sucrose and starch) throughout the day. While sucrose is translocated in the plant both during the day and night, starch builds up in the chloroplast during the day and is broken down to sucrose in the night, which is then ...


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Characterizing the diurnal decrease in photosystem II operating efficiency

Rapid increases in light intensity that exceed the capacity of photosynthesis can result in the inactivation of the reaction centres of the photosystems (PS) in leaves. Plants can acclimate to such changing light conditions, which is highlighted by the ...


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Measuring photosynthesis parameters in the field: how to create a fully working leaf dynamic photosynthesis model?

In this project you will do real field work, as you will derive these photosynthesis parameters by performing leaf gas exchange measurements on a field-grown summer wheat crop close to Wageningen campus. The gas exchange ...


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Measuring canopy architecture of field-grown crops through 3D imaging: how does the architecture influence in-canopy sunlight fluctuations?

Plants use sunlight for photosynthesis: the absorbed sunlight drives plant growth. When sunlight varies smoothly in time, the photosynthesis process is very well able to adjust ...


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Understanding the mechanisms of systemic signaling in dynamic photosynthesis

Plants grown in natural environment and greenhouses frequently experience changes in irradiance. When a shaded leaf is suddenly exposed to a high irradiance, leaf photosynthesis gradually increases rather than immediately ...


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Finding novel methods for high throughput phenotyping and monitoring of photosynthesis induction

After a rapid increase in light intensity, photosynthesis needs a few minutes to reach a new steady state. In most plants, the increase in photosynthesis can be limited by different processes ...


Questions or other ideas for thesis topics? Please contact the HPP student coordinator Katharina Hanika.