Canopy treatments impact of Ascophyllum nodosum on Sangiovese vines subjected to progressive water stress on gas-exchanges parameters

[Autom. eng. transl.] Ascophyllum nodosum is a brown alga whose extract is proposed as a biostimulant capable of promoting growth and productivity of different cultivated species subjected to biotic and abiotic stress (Khan et al. 2009). On Citrus sinensis and Agrostis stolonifera plants commercial preparations based on A.nodosum have resulted in better physiological and vegetative performance under conditions of water and thermal stress, thanks to the role played by osmotically active molecules, such as zeatin riboside and betaine. The present study aims to evaluate the efficacy of an extract of A. nodosum in the physiological response of vines subjected to progressive water stress and in functional recovery following the return of full water volumes.