Speedy stomata, photosynthesis and plant water use efficiency

Lawson, Tracy; Vialet-Chabrand, Silvère

doi:10.1111/nph.15330

Cited by 309 publications

(264 citation statements)

References 45 publications

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“…In addition to increased gas exchange capacity, several studies have reported that dumbbell-shaped stomata display rapid stomatal movements, in which the rate of stomatal opening is at least an order of magnitude faster than in kidney-shaped stomata (Franks and Farquhar, 2007;Drake et al, 2013;McAusland et al, 2016;Chen et al, 2017;Raissig et al, 2017). These so-called 'speedy' stomata are believed to enable greater optimisation of gas exchange under fluctuating environmental conditions (McAusland et al, 2016;Lawson and Vialet-Chabrand, 2019). For example, plants with highly responsive stomata may be better able to utilise transient periods of high light (e.g.…”

Section: Stomatal Shapementioning

confidence: 99%

The influence of stomatal morphology and distribution on photosynthetic gas exchange

et al. 2019

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Summary The intricate and interconnecting reactions of C3 photosynthesis are often limited by one of two fundamental processes: the conversion of solar energy into chemical energy, or the diffusion of CO2 from the atmosphere through the stomata, and ultimately into the chloroplast. In this review, we explore how the contributions of stomatal morphology and distribution can affect photosynthesis, through changes in gaseous exchange. The factors driving this relationship are considered, and recent results from studies investigating the effects of stomatal shape, size, density and patterning on photosynthesis are discussed. We suggest that the interplay between stomatal gaseous exchange and photosynthesis is complex, and that a disconnect often exists between the rates of CO2 diffusion and photosynthetic carbon fixation. The mechanisms that allow for substantial reductions in maximum stomatal conductance without affecting photosynthesis are highly dependent on environmental factors, such as light intensity, and could be exploited to improve crop performance.

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Section: Stomatal Shapementioning

confidence: 99%

The influence of stomatal morphology and distribution on photosynthetic gas exchange

et al. 2019

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“…Stomata regulate the exchange of carbon and water between plants and the atmosphere (Cowan & Farquhar, 1977;Lawson & Vialet-Chabrand, 2018;Sperry et al, 2017). At large scales, control of stomatal aperture regulates regional and global biogeochemical cycles of carbon, water and energy, and influences the climate through vegetation-mediated climate feedbacks (Bonan, 2008;Pielke et al, 1998;Zeng et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

The response of stomatal conductance to seasonal drought in tropical forests

Serbin

Ely

et al. 2019

Global Change Biology

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Stomata regulate CO2 uptake for photosynthesis and water loss through transpiration. The approaches used to represent stomatal conductance (gs) in models vary. In particular, current understanding of drivers of the variation in a key parameter in those models, the slope parameter (i.e. a measure of intrinsic plant water‐use‐efficiency), is still limited, particularly in the tropics. Here we collected diurnal measurements of leaf gas exchange and leaf water potential (Ψleaf), and a suite of plant traits from the upper canopy of 15 tropical trees in two contrasting Panamanian forests throughout the dry season of the 2016 El Niño. The plant traits included wood density, leaf‐mass‐per‐area (LMA), leaf carboxylation capacity (Vc,max), leaf water content, the degree of isohydry, and predawn Ψleaf. We first investigated how the choice of four commonly used leaf‐level gs models with and without the inclusion of Ψleaf as an additional predictor variable influence the ability to predict gs, and then explored the abiotic (i.e. month, site‐month interaction) and biotic (i.e. tree‐species‐specific characteristics) drivers of slope parameter variation. Our results show that the inclusion of Ψleaf did not improve model performance and that the models that represent the response of gs to vapor pressure deficit performed better than corresponding models that respond to relative humidity. Within each gs model, we found large variation in the slope parameter, and this variation was attributable to the biotic driver, rather than abiotic drivers. We further investigated potential relationships between the slope parameter and the six available plant traits mentioned above, and found that only one trait, LMA, had a significant correlation with the slope parameter (R2 = 0.66, n = 15), highlighting a potential path towards improved model parameterization. This study advances understanding of gs dynamics over seasonal drought, and identifies a practical, trait‐based approach to improve modeling of carbon and water exchange in tropical forests.

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confidence: 99%

“…Stomata play a pivotal role in protecting plants from immediate or long‐term damage associated with changes in environmental conditions or pathogen attack (Melotto et al ., ; Cutler et al ., ; Vahisalu et al ., ; Woolfenden et al ., ; Lawson & Vialet‐Chabrand, ). They can respond rapidly, by closing or opening their aperture within minutes, or more slowly over hours (Melotto et al ., ; Cutler et al ., ; Vahisalu et al ., ; Raven, ; Guzel Deger et al ., ; Chen et al ., ; Woolfenden et al ., ; Zhang et al ., ; Lawson & Vialet‐Chabrand, ). Rapid changes in stomatal aperture were reported to occur in treated leaves of plants in response to changes in air humidity, CO 2 concentration, light stress, or pathogen attack (Melotto et al ., ; Vahisalu et al ., ; Raven, ; Guzel Deger et al ., ; Chen et al ., ; Devireddy et al ., ; Zhang et al ., ).…”

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confidence: 99%