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SUMMARY:Effects of fluctuating light on photosynthesis and stomatal behavi
 our: impacts on carbon gain and water use efficiency - Tracy Lawson\, Dire
 ctor of Plant Phenomics\, University of Essex
DTSTART:20160303T130000Z
DTEND:20160303T140000Z
UID:TALK63121@talks.cam.ac.uk
CONTACT:38889
DESCRIPTION:Photosynthetic carbon gain and stomatal behaviour is dependent
  upon light intensity. In the field plants experience a range of light int
 ensities and over the long term modify their growth through changes in lea
 f anatomy and morphology (e.g. sun and shade leaves).  In a naturally fluc
 tuating environment\, stomata and photosynthesis are continually experienc
 ing and adjusting to a variable light intensity. However\, these responses
  are not always synchronized\, as stomatal movements can be an order of ma
 gnitude slower than the more rapid photosynthetic response. Therefore over
  the diel period\, short term fluctuations in light (sun/shade flecks) dri
 ve temporal and spatial dynamics of carbon gain and water loss\, meaning t
 hat under natural fluctuating environmental conditions water use efficienc
 y is far from optimal. A consequence of CO2 diffusion limitation is a decr
 ease in photochemical sink capacity for excitation energy that can lead to
  photoinhibition under high light. Non-photochemical quenching processes a
 re vital for dissipating excess excitation pressure\, particularly in a dy
 namic light environment.  However\, in the laboratory we generally grow pl
 ants under square wave lighting regimes that do not mimic the natural envi
 ronment. Little is known about the effect of a fluctuating growth light en
 vironment on plant photosynthesis or stomatal behaviour\; for example\, do
  stomata respond faster and/or photosynthetic capacity differ when compare
 d to conventionally grown square wave plants? Photosynthetic and stomatal 
 response data from plants that have been grown under LEDs in a fluctuating
  or ‘constant’ square wave lighting regimes of identical photoperiods 
 and total daily light intensity. 
LOCATION:Department of Plant Sciences\, Large Lecture Theatre
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