Abstract
Climate change scenarios and the need of sustainable tools to reduce global warming impact on agriculture have led to the
formulation of a large number of natural products or biostimulants that should increase plant resilience to abiotic stress.
Ascophyllum nodosum (AN) extract is one of the most studied biostimulants to increase tolerance to drought stress, but the
physiological mechanism underlying its action is still poorly understood. The aim of the present work was to determine AN
extract impact on grapevine gas exchange under well-watered and water stress conditions and to examine its mode of action
under stress (light and temperature). AN caused a slight increase in stomatal conductance that resulted in an increase of water
plant conductivity to atmosphere. Increased transpiration induced by AN improved leaf thermoregulation, facilitating vine
recovery after a stress period. AN increased transpiration through a reduction of stomatal sensitivity to VPD. AN action on
stomata regulation indicated that this biostimulant could be a new potential tool to limit leaf damage during events of extreme
temperature, even when they are not combined with water stress conditions.
Lingua originale | English |
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pagine (da-a) | 1293-1304 |
Numero di pagine | 12 |
Rivista | Journal of Applied Phycology |
Volume | 33 |
DOI | |
Stato di pubblicazione | Pubblicato - 2020 |
Keywords
- biostimulant
- grapevine
- light stress
- stomata regulation