GRAPE VINE MORPHOLOGICAL AND PHYSIOLOGICAL INDICES - COMPARATIVE ANALYSIS IN 'FETEASCA NEAGRA' AND 'CABERNET SAUVIGNON'

Abstract

The study analyzed the variation of some morphological parameters and physiological indices in the annual vine shoots, the 'Cabernet Sauvignon' and 'Feteasca Neagra' grape cultivars, as well as the functionality of the leaf area in relation to grapes and sugars production. In the BBCH 71-73 stage,  were determined the length of the internodes (Int L, cm), the length of the leaf petiole (Pet L, cm), the length of the leaf (LL, cm), the width of the leaf (Lw, cm), leaf area (LA, cm²), chlorophyll content (Chl, SPAD), and carotenoid content (Car). The leaf area was calculated in relation to the unitary production of grapes (LA/ 1 kg berry - LA_Gup) and the leaf surface to the unitary production of sugars (LA/ 1 kg sugar - LA_Sup). The comparative analysis between the mean values of the parameters in the two cultivars highlighted differences in statistical safety conditions for Car (p<0.05), for Lw and LA_Sug (p<0.01) and for IL, LL, LA, and LA_Gup (p<0.01). The LA functionality for grape unitary production (Gup) and sugar unitary production (Sup) was described by mathematical and graphical models under statistical safety conditions (p<0.001).