How the interactions between atmospheric and soil drought affect the functionality of plant hydraulics

Cai, Gaochao; Wankmüller, Fabian; Ahmed, Mutez Ali; Carminati, Andrea

doi:10.1111/pce.14538

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Under the assumption that stomatal closure at night prohibits transpiration and that there was ample time for hydraulic equilibrium to be established, predawn leaf water potential (Ψ pd ) has been proposed as a proxy for Ψ soil [5]. Many studies and models exploring plant water relations are based on Ψ pd being a proxy for Ψ soil without explicitly testing the underlying assumptions [6][7][8][9][10]; "Ψ pd = Ψ soil " has become a 'rule of thumb'. and Ψ pd before comparing different genotypes, both between and within species, for their water stress response.…”

Section: Introductionmentioning

confidence: 99%

Predawn leaf water potential of grapevines is not necessarily a good proxy for soil moisture

Groenveld

Obiero

et al. 2023

Preprint

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Background In plant water relations research, predawn leaf water potential (Ψpd) is often used as a proxy for soil water potential (Ψsoil), without testing the underlying assumptions that nighttime transpiration is negligible and that enough time has passed for a hydrostatic equilibrium to be established. The goal of this research was to test the assumption that Ψpd = Ψsoil for field-grown grapevines.Results A field trial was conducted with 30 different varieties of wine grapes grown in a single vineyard in arid southeastern Washington, USA, for two years. The Ψpd and the volumetric soil water content (θv) under each sampled plant were measured multiple times during several dry-down cycles. The results show that in wet soil (θv > 0.146 m3 m− 3), Ψpd was significantly lower than Ψsoil for all 30 varieties. Under drought conditions (θv < 0.105 m3 m− 3) Ψpd lined up better with Ψsoil. There were differences between varieties, but these were not consistent over the years.Conclusion These results suggest that for wet soils Ψpd of grapevines cannot be used as a proxy for Ψsoil, while the Ψpd = Ψsoil assumption holds for dry soils.

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Section: Introductionmentioning

confidence: 99%

Predawn leaf water potential of grapevines is not necessarily a good proxy for soil moisture

Groenveld

Obiero

et al. 2023

Preprint

View full text Add to dashboard Cite

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The multidimensionality of plant drought stress: The relative importance of edaphic and atmospheric drought

Berauer,

Steppuhn,

Schweiger

2024

Plant Cell & Environment

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Drought threatens plant growth and related ecosystem services. The emergence of plant drought stress under edaphic drought is well studied, whilst the importance of atmospheric drought only recently gained momentum. Yet, little is known about the interaction and relative contribution of edaphic and atmospheric drought on the emergence of plant drought stress. We conducted a gradient experiment, fully crossing gravimetric water content (GWC: maximum water holding capacity—permanent wilting point) and vapour pressure deficit (VPD: 1−2.25 kPa) using five wheat varieties from three species (Triticum monococcum, T. durum & T. aestivum). We quantified the occurrence of plant drought stress on molecular (abscisic acid), cellular (stomatal conductance), organ (leaf water potential) and stand level (evapotranspiration). Plant drought stress increased with decreasing GWC across all organizational levels. This effect was magnified nonlinearly by VPD after passing a critical threshold of soil water availability. At around 20%GWC (soil matric potential 0.012 MPa), plants lost their ability to regulate leaf water potential via stomata regulation, followed by the emergence of hydraulic dysfunction. The emergence of plant drought stress is characterized by changing relative contributions of soil versus atmosphere and their non‐linear interaction. This highly non‐linear response is likely to abruptly alter plant‐related ecosystem services in a drying world.

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Predawn leaf water potential of grapevines is not necessarily a good proxy for soil moisture

Groenveld,

Obiero,

et al. 2023

BMC Plant Biol

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Background In plant water relations research, predawn leaf water potential (Ψpd) is often used as a proxy for soil water potential (Ψsoil), without testing the underlying assumptions that nighttime transpiration is negligible and that enough time has passed for a hydrostatic equilibrium to be established. The goal of this research was to test the assumption Ψpd = Ψsoil for field-grown grapevines. Results A field trial was conducted with 30 different cultivars of wine grapes grown in a single vineyard in arid southeastern Washington, USA, for two years. The Ψpd and the volumetric soil water content (θv) under each sampled plant were measured multiple times during several dry-down cycles. The results show that in wet soil (Ψsoil > − 0.14 MPa or relative extractable water content, θe > 0.36), Ψpd was significantly lower than Ψsoil for all 30 cultivars. Under dry soil conditions (Ψsoil < − 0.14 MPa or θe < 0.36) Ψpd lined up better with Ψsoil. There were differences between cultivars, but these were not consistent over the years. Conclusion These results suggest that for wet soils Ψpd of grapevines cannot be used as a proxy for Ψsoil, while the Ψpd = Ψsoil assumption may hold for dry soils.

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How the interactions between atmospheric and soil drought affect the functionality of plant hydraulics

Cited by 3 publications

References 9 publications

Predawn leaf water potential of grapevines is not necessarily a good proxy for soil moisture

Predawn leaf water potential of grapevines is not necessarily a good proxy for soil moisture

The multidimensionality of plant drought stress: The relative importance of edaphic and atmospheric drought

Predawn leaf water potential of grapevines is not necessarily a good proxy for soil moisture

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