visits viniferal تاثير دانه هاي گرده سترون حلقه برداري و جيبر ليك اسيد روي ميوه بندي رشد و كيفيت ميوه در سه رقم انگور ماده

EFFECETS OF STERILE POLLEN GRAINS, GIRDLING AND GIBBERELLIC ACID ON FRUIT SET, GROWTH AND QUALITY OF FRUITS IN THREE FEMALE VINE CULTIVARS (Vitis vinifera L.)

An experiment with four replications was carried out in growth season of 2000 at Viticulture Part of Khalat-Poshan Research Station. Faculty of Agriculture. Tabriz University, to investigate the function of sterile pollen grains, girdling and gibberellic acid on fruit set and growth in three female vine cultivars (ʹAlhaghiʹ ,ʹKhalili-e-Siahʹ and Zohreh Bisti). Results indicated that the pollen grains of these cultivars were sterile and acolporate (without three typical grooves in normal Vitis pollen grains). These pollen grains could not germinated even in culture medium. In all the cvs, all the emasculated flower ovaries which were protected from any external pollen grains. were abscised. The inflorescence rachis was also dried up. Thus. in these cvs, sterile pollen grains can stimulate the production of parthenocarpic fruits. Girdling, I to 2 d before an thesis and 150 mg 1-1GA3, when 50 to 70% of flowers were opened, increased the fruit set, significantly (at 1% level) in self-pollinated flowers. In addition to increase fruit set percentage, the. juice pH and length) to diameter ratio of berries were also increased by gibberellic acid treatment but soluble solids were decreased. Girdling also increased the fruit set and soluble solids.