2017
DOI: 10.1093/jxb/erx052
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Increase in leaf temperature opens stomata and decouples net photosynthesis from stomatal conductance in Pinus taeda and Populus deltoides x nigra

Abstract: HighlightStomatal conductance of two species (a broadleaf and a conifer) increased with increasing temperature. This response was independent of carbon metabolism, plant water status, or vapour pressure difference.

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Cited by 350 publications
(291 citation statements)
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“…OnGuard2 faithfully reproduced the experimentally determined kinetics and dependence of stomatal aperture and g s on VPD and water availability, notably a weak dependence on VPD unless water delivery to the leaf was limited; it replicated the curvilinear effects of leaf temperature on aperture and g s (Supplemental Figure 1) previously reported across a range of species in the literature (Wilson, 1948;Stalfelt, 1962;Farquhar and Sharkey, 1982;Spence et al, 1984;Urban et al, 2017); it showed the opposing changes in guard cell osmolarity and turgor (Figure 2) expected of a unified framework equating VPD to extracellular osmotic potential; and it recapitulated previously published data of enhanced Mal synthesis and accumulation with osmotic stress (Asai et al, 1999(Asai et al, , 2000. Noteworthy to these predictions, within OnGuard2 it is the change in water potential of the apoplast around the guard cell with a VPD step that drives water flux across the guard cell plasma membrane, thereby affecting guard cell volume, the free concentration of solute within the guard cell, and engaging changes in ion transport and metabolism (Figure 8).…”
Section: Discussionsupporting
confidence: 78%
See 1 more Smart Citation
“…OnGuard2 faithfully reproduced the experimentally determined kinetics and dependence of stomatal aperture and g s on VPD and water availability, notably a weak dependence on VPD unless water delivery to the leaf was limited; it replicated the curvilinear effects of leaf temperature on aperture and g s (Supplemental Figure 1) previously reported across a range of species in the literature (Wilson, 1948;Stalfelt, 1962;Farquhar and Sharkey, 1982;Spence et al, 1984;Urban et al, 2017); it showed the opposing changes in guard cell osmolarity and turgor (Figure 2) expected of a unified framework equating VPD to extracellular osmotic potential; and it recapitulated previously published data of enhanced Mal synthesis and accumulation with osmotic stress (Asai et al, 1999(Asai et al, , 2000. Noteworthy to these predictions, within OnGuard2 it is the change in water potential of the apoplast around the guard cell with a VPD step that drives water flux across the guard cell plasma membrane, thereby affecting guard cell volume, the free concentration of solute within the guard cell, and engaging changes in ion transport and metabolism (Figure 8).…”
Section: Discussionsupporting
confidence: 78%
“…The model also demonstrated a dependence on temperature (Supplemental Figure 1) that is broadly consistent with the curvilinear relationships previously reported for stomatal aperture across a number of species (Wilson, 1948;Stalfelt, 1962;Spence et al, 1984;Willmer and Fricker, 1996;Urban et al, 2017).…”
Section: Onguard2 Predicts a Steep Dependence Of G S At Limiting Hydrsupporting
confidence: 84%
“…Therefore, we have conducted a controlled experiment in the growth chambers on two tree species with contrasting anatomy and physiology: a broad leaved species, poplar (Populus deltoides x nigra) and coniferous species, loblolly pine (Pinus taeda). 22 We manipulated air temperature and VPD across large range (20 -49 °C and 0 -10 kPa, respectively) and we repeated the measurements under well-watered and droughted conditions and under ambient and elevated CO 2 concentration ([CO 2 ], 400 and 800 ”mol mol 1 ).…”
Section: Textmentioning
confidence: 99%
“…Systemic change in leaf temperature can significantly affect the C assimilation and transpiration (Amissah et al, 2015;Martins et al, 2014;Quero et al, 2006). Rising temperature leads to increases in stomatal conductance and transpiration, which in turn may result in reduction of leaf temperature (Urban et al, 2017a(Urban et al, , 2017b. Rising temperature leads to increases in stomatal conductance and transpiration, which in turn may result in reduction of leaf temperature (Urban et al, 2017a(Urban et al, , 2017b.…”
Section: Introductionmentioning
confidence: 99%