Ascophyllum nodosum extract improves leaf thermoregulation by reducing stomatal sensitivity to VPD in Vitis vinifera L

Sergio Tombesi, Tommaso Frioni, Stefano Poni, Paolo Sabbatini, Alberto Palliotti

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

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 originaleEnglish
pagine (da-a)1293-1304
Numero di pagine12
RivistaJournal of Applied Phycology
Volume33
DOI
Stato di pubblicazionePubblicato - 2020

Keywords

  • biostimulant
  • grapevine
  • light stress
  • stomata regulation

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