Stomatal regulation prevents plants from critical water potentials during drought: Result of a model linking soil–plant hydraulics to abscisic acid dynamics

Wankmüller, Fabian; Carminati, Andrea

doi:10.1002/eco.2386

Cited by 27 publications

(41 citation statements)

References 85 publications

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Section: Root Hydraulic Conductancementioning

confidence: 67%

“…A similar concept was proposed by Sperry and Love ( 2015 ) and Sperry et al ( 2016 ). A mechanism that allows stomata to accomplish this function has been recently proposed by Wankmüller and Carminati ( 2021 ). The idea is that stomatal conductance is regulated by the abscisic acid (ABA) level, which depends on the dynamic equilibrium between ABA production (assumed to increase with decreasing leaf water potential) and catabolism (assumed to increase with assimilation).…”

Section: Discussionmentioning

confidence: 99%

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Root hydraulic phenotypes impacting water uptake in drying soils

Cai

Ahmed

Abdalla

et al. 2022

Plant Cell & Environment

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Soil drying is a limiting factor for crop production worldwide. Yet, it is not clear how soil drying impacts water uptake across different soils, species, and root phenotypes.Here we ask (1) what root phenotypes improve the water use from drying soils? and(2) what root hydraulic properties impact water flow across the soil-plant continuum? The main objective is to propose a hydraulic framework to investigate the interplay between soil and root hydraulic properties on water uptake. We collected highly resolved data on transpiration, leaf and soil water potential across 11 crops and 10 contrasting soil textures. In drying soils, the drop in water potential at the soil-root interface resulted in a rapid decrease in soil hydraulic conductance, especially at higher transpiration rates. The analysis reveals that water uptake was limited by soil within a wide range of soil water potential (−6 to −1000 kPa), depending on both soil textures and root hydraulic phenotypes. We propose that a root phenotype with low root hydraulic conductance, long roots and/or long and dense root hairs postpones soil limitation in drying soils. The consequence of these root phenotypes on crop water use is discussed.

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Section: Root Hydraulic Conductancementioning

confidence: 67%

Section: Discussionmentioning

confidence: 99%

Root hydraulic phenotypes impacting water uptake in drying soils

Cai

Ahmed

Abdalla

et al. 2022

Plant Cell & Environment

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“…Therefore, including a stomatal model into the soil plant hydraulic model might improve the predictions of the E -Ψ leaf relationship (e.g. Wankmüller and Carminati 2022).…”

Section: Suitability Of Using Pre-dawn Leaf Water Potential As a Pred...mentioning

confidence: 99%

Going underground: soil hydraulic properties impacting maize responsiveness to water deficit

et al. 2022

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Purpose Although the coordination between stomatal closure and aboveground hydraulics has extensively been studied, our understanding of the impact of belowground hydraulics on stomatal regulation remains incomplete. Here, we investigated whether and how the water use of maize (Zea mays L.) varied under hydraulically contrasting soil textures. Our hypothesis is that a textural-specific drop in the hydraulic conductivity is associated with a distinct decrease in transpiration during soil drying. Methods Maize plants were grown in contrasting soil textures (sand, sandy loam, loam) and exposed to soil drying. We measured the relationships between transpiration rate, soil water content as well as soil and leaf water potential. We used a soil-plant hydraulic model to reproduce the experimental observations and infer the hydraulic conductance of the soil-plant system during soil drying. Results We observed the impact of soil texture on plant response to soil drying in various relationships. The soil water potentials at which transpiration decreased were more than one order of magnitude more negative in loam than in sand. The soil-plant conductance decreased not only abruptly but also at less negative soil water potentials in sand than in sandy loam or loam. Stomata closed at less negative leaf water potentials in sand than in loam. The model predictions matched well the experimental observations. Conclusion The results elucidated that the critical soil water content and potential at which plants close stomata depends on the soil texture. These findings support our plea to include soil properties for understanding and predicting stomatal regulation during soil drying.

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“…Their proposed model of stomatal regulation is based on the level abscisic acid levels without invoking an optimality principle between carbon gain and water loss. The model of Wankmüller and Carminati (2022) predicted that stomatal closure is controlled by the relationship between photosynthesis and stomatal conductance with low VPD and no water limitation and that stomatal closure is induced by a sharp decline of leaf water potential from transpiration at high VPDs or limited water supply.…”

Section: Reflection On Themes and Current Progressmentioning

confidence: 99%

“…Model results showed none of the peatland sites ever reached 100 cm, a known ecohydrological threshold for moss, in single year simulations but longer term models did demonstrate days at the threshold for some key sites, which could negatively affect moss recolonization potential. Wankmüller and Carminati (2022) provided a new modelling approach that offers and explanation on how plants can avoid critical water potentials during drought. Their proposed model of stomatal regulation is based on the level abscisic acid levels without invoking an optimality principle between carbon gain and water loss.…”

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confidence: 99%