Research Seminar: Professor Tracy Lawson - University of Essex
Professor Tracy Lawson hosted by Dr Heather Whitney
Life Sciences Seminar Room G13/G14
Effects of fluctuating light on photosynthesis and stomatal behaviour: impacts on carbon gain and water use efficiency
In a naturally fluctuating environment, stomata and photosynthesis are continually experiencing and adjusting to a variable light intensity. However, these responses are not always synchronized, as stomatal movements can be an order of magnitude slower than the more rapid photosynthetic response. Therefore over the diel period, short term fluctuations in light (sun/shade flecks) drive temporal and spatial dynamics of carbon gain and water loss, meaning that under natural fluctuating environmental conditions water use efficiency is far from optimal. However, in the laboratory we generally grow plants under square wave lighting regimes that do not mimic the natural environment. Little is known about the effect of a fluctuating growth light environment on plant photosynthesis or stomatal behaviour; for example, do stomata respond faster and/or photosynthetic capacity differ when compared to conventionally grown square wave plants?
Tracy Lawson, Jack Matthews & Silvere Vialet-Chabrand
School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ
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