CORSO, Déborah; DELZON, Sylvain; LAMARQUE, Laurent J; COCHARD, Hervé; TORRES-RUIZ, José M; KING, Andrew; BRODRIBB, Timothy

doi:10.1111/pce.13722

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CORSO, Déborah

DELZON, Sylvain

Biodiversité, Gènes & Communautés [BioGeCo]

LAMARQUE, Laurent J
Biodiversité, Gènes & Communautés [BioGeCo]
Ecophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]

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Plant, Cell and Environment. 2020-01-01, vol. 43, n° 4, p. 854-865

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Identifying the drivers of stomatal closure and leaf damage during stress in grasses is a critical prerequisite for understanding crop resilience. Here, we investigated whether changes in stomatal conductance (g ) during dehydration were associated with changes in leaf hydraulic conductance (K ), xylem cavitation, xylem collapse, and leaf cell turgor in wheat (Triticum aestivum). During soil dehydration, the decline of g was concomitant with declining K under mild water stress. This early decline of leaf hydraulic conductance was not driven by cavitation, as the first cavitation events in leaf and stem were detected well after K had declined. Xylem vessel deformation could only account for <5% of the observed decline in leaf hydraulic conductance during dehydration. Thus, we concluded that changes in the hydraulic conductance of tissues outside the xylem were responsible for the majority of K decline during leaf dehydration in wheat. However, the contribution of leaf resistance to whole plant resistance was less than other tissues (<35% of whole plant resistance), and this proportion remained constant as plants dehydrated, indicating that K decline during water stress was not a major driver of stomatal closure.< Réduire

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crops

drought stress

hydraulic conductance

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Neither xylem collapse, cavitation, or changing leaf conductance drive stomatal closure in wheat.

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