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Optimising photosynthetic performance, marketable yields and berry quality using blue light

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  • Full or part time
    Prof T Lawson
    Dr A Simkin
    Dr M Else
  • Application Deadline
    No more applications being accepted
  • Funded PhD Project (European/UK Students Only)
    Funded PhD Project (European/UK Students Only)

About This PhD Project

Project Description

Supervisors: Prof Tracy Lawson (University of Essex), Dr Andrew Simkin (NIAB EMR), Dr Mark Else (NIAB EMR)

This student will be registered with the University of Essex. Beginning in October 2020, the successful candidate should have (or expect to have) an Honours Degree (or equivalent) at 2.1 or above in Plant Biology, Plant Physiology or Molecular Biology.


Globally, water usage has increased 6-fold in the past 100 years, twice as fast as the human population, and is forecast to double again before 2030, driven mainly by irrigation and agriculture. In the UK alone, the volume of irrigation water has risen 10-fold in the past 30 years and this trend is set to continue. Additionally, global temperature is predicted to rise by an average 2.7oC by the end of the 21st century, resulting in increased leaf/canopy temperature and a greater need for evaporative cooling. Stomatal transpiration is central to the expected crisis in water availability and crop production.

Since stomatal behaviour influences photosynthesis, water use and leaf temperature, guard cells are an unexploited but important target for study to (i) improve plant water use under conditions of water shortage or (ii) adjust evaporative cooling to optimise leaf temperatures under heat stress where water availability is not limited. Stomata open in response to increasing photosynthetically active radiation (PAR). However, guard cells also exhibit a specific “blue” light response that increases stomatal conductance (gs) at intensities of blue light too low (15 μmol m-2 s-1) to drive net photosynthesis. Preliminary data obtained as part of a Berry Gardens funded pump-priming project in 2018 suggested that blue light pre-treatment during the establishment phase could result in increased rates of photosynthesis later in the season.

Objectives and approaches

This project aims to test the potential of using a higher proportion of blue light during the plant establishment phase to increase photosynthetic performance per unit leaf area and to investigate the effects of blue light treatment on stomatal conductance, water use efficiency, leaf chlorophyll content, chlorophyll a/b ratio, and stomatal density. These data will allow us to determine whether the blue light treatment leads to higher marketable yields and improved fruit quality.

This project will lead to a better understanding of the genetic basis of optimal stomatal dynamics and to facilitate molecular breeding approaches. This will allow smart design of new crop varieties with improved stomatal conductance, canopy temperature, photosynthesis, water use, and ultimately, yield and quality.


The studentship will provide advanced training in crop physiology, photosynthetic adaptation, assessments of fruit quality, growth analysis and use of IRGAs and chlorophyll fluorescence as well as experimental design and statistical analysis. You will work in a supportive group composed of molecular biologists, biochemists and plant physiologists.


Anyone interested should contact [Email Address Removed] for the application form and return the form to [Email Address Removed] citing the reference before the deadline of 28th February 2020. For this specific studentship, we may consider other students not eligible for Research Council funding; however, the candidate must be able to pay additional tuition fees charged by the University of Essex.

Contact Dr Mark Else ([Email Address Removed]) for an informal discussion.

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