Effect of bio-regulators on grape var. Flame Seedless

Grape (Vitis vinifera L.) belong to family vitaceae which is divided into two sub-genera Euvitis Planch (2n=38) and Muscadinia Planch (2n=40). Most commercial grapes belong to genus Vitis which contain about 60 species found mainly in the temperate zones of the Northern Hemisphere and distributed almost equally between America and Asia. It is an important commercial fruit crop and one of the most widely cultivated in Temperate Sub- tropical and Tropical regions of the world. The present investigation indicated that the bio-regulator ABA was found suitable for to develop uniform colour in Flame Seedless grape i.e. Treatment T6 ABA @ 400 ppm at before veraison stage. As refers to yield attributes the treatment T4 i.e. 6-BA @ 300 ppm at before veraison stage showed significantly increased in yield while in respect of quality attributes the bunches dipped in ABA @ 300 ppm i.e. Treatment T5 ABA @ 400 ppm i.e. Treatment T6 before veraison stage and ABA @ 300 ppm i.e. Treatment T11 ABA @ 400 ppm i.e. Treatment T12 after veraison stage showed improvement in quality.