Investigations on the photosynthetic productivity of some newly selected grapevine varieties
AbstractInvestigations were carried out on the photosynthetic productivity of 5 wine varieties which had been selected at the Institute of Viticulture and Enology: Storgoziya, Nikopolski mavrud, Pomoriiski biser, Dunavska gamza and Dunavski lazur. The first of them was grafted on Chasselas x Berlandieri 41 B rootstock, each of the others was on three rootstocks: Chasselas x Berlandieri 41 B, Berlandieri x Riparia SO 4, and. (Berlandieri x Riparia Kober 5 BB) x (Rupestris Martin) III-102 D.
For all varieties, the leaf dry matter per unit leaf area was greatest when they were grafted on 111-102 rootstock. During the vegetation period, the specific leaf weight increased, but the rate of dry matter accumulation in leaves was not constant and gradually decreased with time.
The content of pigments and the leaf area per vine were greatest on SO 4 rootstock On this rootstock, the highest yield was obtained for all cultivars mainly at the expense of the grape cluster weight. The thickness of the trunk under the graft-union, though, was smallest and an irregular increase of the diameters of the two components, rootstock and scion, occurred.
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