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Short-term water stress impacts on stomatal, mesophyll and biochemical limitations to photosynthesis differ consistently among tree species from contrasting climates
Title: | Short-term water stress impacts on stomatal, mesophyll and biochemical limitations to photosynthesis differ consistently among tree species from contrasting climates |
Authors: | Zhou, S Medlyn, B Sabate, S Sperlich, D Prentice, IC |
Item Type: | Journal Article |
Abstract: | Predicting the large-scale consequences of drought in contrasting environments requires that we understand how drought effects differ among species originating from those environments. A previous meta-analysis of published experiments suggested that the effects of drought on both stomatal and non-stomatal limitations to photosynthesis may vary consistently among species from different hydroclimates. Here, we explicitly tested this hypothesis with two short-term water stress experiments on congeneric mesic and xeric species. One experiment was run in Australia using Eucalyptus species and the second was run in Spain using Quercus species as well as two more mesic species. In each experiment, plants were grown under moist conditions in a glasshouse, then deprived of water, and gas exchange was monitored. The stomatal response was analysed with a recently developed stomatal model, whose single parameter g1 represents the slope of the relationship between stomatal conductance and photosynthesis. The non-stomatal response was partitioned into effects on mesophyll conductance (gm), the maximum Rubisco activity (Vcmax) and the maximum electron transport rate (Jmax). We found consistency among the drought responses of g1, gm, Vcmax and Jmax, suggesting that drought imposes limitations on Rubisco activity and RuBP regeneration capacity concurrently with declines in stomatal and mesophyll conductance. Within each experiment, the more xeric species showed relatively high g1 under moist conditions, low drought sensitivity of g1, gm, Vcmax and Jmax, and more negative values of the critical pre-dawn water potential at which Vcmax declines most steeply, compared with the more mesic species. These results indicate adaptive interspecific differences in drought responses that allow xeric tree species to continue transpiration and photosynthesis for longer during periods without rain. |
Issue Date: | 1-Oct-2014 |
Date of Acceptance: | 28-Jul-2014 |
URI: | http://hdl.handle.net/10044/1/70451 |
DOI: | https://doi.org/10.1093/treephys/tpu072 |
ISSN: | 1758-4469 |
Publisher: | Oxford University Press (OUP) |
Start Page: | 1035 |
End Page: | 1046 |
Journal / Book Title: | Tree Physiology |
Volume: | 34 |
Issue: | 10 |
Copyright Statement: | © 2014 Oxford University Press. This is a pre-copy-editing, author-produced version of an article accepted for publication in Tree Physiology following peer review. The definitive publisher-authenticated version [Shuangxi Zhou, Belinda Medlyn, Santiago Sabaté, Dominik Sperlich, I. Colin Prentice, David Whitehead, Short-term water stress impacts on stomatal, mesophyll and biochemical limitations to photosynthesis differ consistently among tree species from contrasting climates, Tree Physiology, Volume 34, Issue 10, October 2014, Pages 1035–1046, https://doi.org/10.1093/treephys/tpu072] is available online at: https://doi.org/10.1093/treephys/tpu072. |
Keywords: | Science & Technology Life Sciences & Biomedicine Forestry drought sensitivity gas exchange hydroclimate J(max) mesophyll conductance model stomatal conductance V-cmax DECREASED RUBISCO ACTIVITY GAS-EXCHANGE NONSTOMATAL LIMITATIONS DIFFUSION CONDUCTANCE SPECIFICITY FACTOR CO2 CONCENTRATION DROUGHT MODEL LEAVES RESPONSES Jmax Vcmax. drought sensitivity gas exchange hydroclimate mesophyll conductance model stomatal conductance Alnus Climate Dehydration Eucalyptus Fraxinus Mesophyll Cells Photosynthesis Plant Leaves Plant Stomata Plant Transpiration Quercus Trees Alnus Quercus Eucalyptus Fraxinus Plant Leaves Trees Dehydration Climate Photosynthesis Plant Transpiration Plant Stomata Mesophyll Cells Science & Technology Life Sciences & Biomedicine Forestry drought sensitivity gas exchange hydroclimate J(max) mesophyll conductance model stomatal conductance V-cmax DECREASED RUBISCO ACTIVITY GAS-EXCHANGE NONSTOMATAL LIMITATIONS DIFFUSION CONDUCTANCE SPECIFICITY FACTOR CO2 CONCENTRATION DROUGHT MODEL LEAVES RESPONSES 0705 Forestry Sciences 0607 Plant Biology 0602 Ecology Plant Biology & Botany |
Publication Status: | Published |
Online Publication Date: | 2014-09-04 |
Appears in Collections: | Department of Life Sciences Grantham Institute for Climate Change |