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Effects of kinetics of light-induced stomatal responses on photosynthesis and water-use efficiency

McAusland, Lorna and Vialet-Chabrand, Silvère and Davey, Philip and Baker, Neil R and Brendel, Oliver and Lawson, Tracy (2016) 'Effects of kinetics of light-induced stomatal responses on photosynthesis and water-use efficiency.' New Phytologist, 211 (4). pp. 1209-1220. ISSN 0028-646X

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Both photosynthesis (A) and stomatal conductance (g s ) respond to changing irradiance, yet stomatal responses are an order of magnitude slower than photosynthesis, resulting in noncoordination between A and g s in dynamic light environments. Infrared gas exchange analysis was used to examine the temporal responses and coordination of A and g s to a step increase and decrease in light in a range of different species, and the impact on intrinsic water use efficiency was evaluated. The temporal responses revealed a large range of strategies to save water or maximize photosynthesis in the different species used in this study but also displayed an uncoupling of A and g s in most of the species. The shape of the guard cells influenced the rapidity of response and the overall g s values achieved, with different impacts on A and W i . The rapidity of g s in dumbbell-shaped guard cells could be attributed to size, whilst in elliptical-shaped guard cells features other than anatomy were more important for kinetics. Our findings suggest significant variation in the rapidity of stomatal responses amongst species, providing a novel target for improving photosynthesis and water use.

Item Type: Article
Uncontrolled Keywords: guard cells, intrinsic water use efficiency, kinetics of stomatal responses, photosynthesis, stomatal conductance
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health
Faculty of Science and Health > Life Sciences, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 23 May 2016 20:25
Last Modified: 18 Aug 2022 11:10

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