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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

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Tree Physiol Zhou et al marked-up revised copy.docAccepted version381 kBMicrosoft WordView/Open
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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