CREEK, Danielle; LAMARQUE, Laurent; TORRES RUIZ, Jose Manuel; PARISE, Camille; BURLETT, Régis; TISSUE, David T.; DELZON, Sylvain

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CREEK, Danielle
Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]

LAMARQUE, Laurent
Biodiversité, Gènes & Communautés [BioGeCo]

TORRES RUIZ, Jose Manuel
Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]

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Communication dans un congrès avec actes

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4th Xylem International Meeting, 2019-09-25, Padoue. 2019p. 84

Univ. Degli Studi Di Padova

Résumé en anglais

Drought represents a major abiotic constraint to plant growth and survival. On one hand, plants keep stomata open for efficient carbon assimilation, while on the other hand, they close them to prevent permanent hydraulic impairment from xylem embolism. The order of occurrence of these two processes (stomatal closure and the onset of leaf embolism) throughout plant dehydration has remained controversial, largely due to methodological limitations. However, the newly developed Optical Visualisation (OV) method now allows simultaneous monitoring of stomatal behaviour and leaf embolism formation in intact plants. We used this new approach directly by dehydrating intact saplings of three contrasting tree species and indirectly by conducting a literature survey across a greater range of plant taxa. Our results indicate that increasing water stress generates the onset of leaf embolism consistently after stomatal closure, and that the lag time between these processes (i.e. the safety margin) increases with increasing embolism resistance. This suggests that during water stress, embolism-mediated declines in leaf hydraulic conductivity are unlikely to act as a signal for stomatal down-regulation. Instead, plants converge towards a strategy of closing stomata early to prevent water loss and delay catastrophic xylem dysfunction.< Réduire

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stress hydrique

sécheresse

Mots clés en anglais

water stress

sécheresse

drought

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Xylem embolism in leaves does not occur with open stomata: evidence from direct observations using the optical visualisation technique

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