Role of foliar biostimulants (of plant origin) on grapevine adaptation to climate change

Heat waves and drought stress are typical aspects of current climate change, significantly affecting the grapevine physiology in many world growing areas. Biostimulants can play an important role reducing negative effects change; that’s why this experiment was set up order to test two new foliar biostimulants (protein hydrolysates plant origin). The field carried out 2017 2018 Oltrepo pavese area (Lombardia region, northwest Italy, 270 m asl), on a six-year-old vineyard V. vinifera L. cv. Merlot clone 181 grafted Gravesac, Guyot trellis, 4,000 vines/ha not irrigated. Two protein origin were sprayed twice, just after fruit 15 days later, by using 2.5 L/ha. Leaf proteomics metabolomics studied 2017, while productive qualitative data recorded both years at harvest (September 1 st , August 28 th 2018). most significant findings were: (a) treatments slowed down grape ripening, stimulating vegetative activity sugar accumulation; (b) less heat symptoms observed canopies treated vines, as compared control ones.