Les teneurs en acides gras, en eau et en acide abscissique des feuilles de vigne (Vitis vinifera L. var. Cabernet Sauvignon) infectées par Eutypa lata

Water, fatty acids and abscisic acid contents of grapevine leaves (Vitis vinifera, cv. Cabernet Sauvignon) infected by Eutypa lataEytypiose of grapevines led to a lowering of the water content and to an accumulation of abscisic acid (ABA) in the leaves of Cabernet Sauvignon known to be susceptible to Eutypiose. The accumulation of ABA in the leaves of infected plants possibly causes changes in the composition of fatty acids, in partiular by reducing their degree of insaturation and by elongating their aliphatic chains. These changes may lower the permeability of membranes and, as a consequence, exchanges with the environment, which possibly intensifies dehydration of infected leaves during their development.