Influence of Plant Growth Regulators to Improve the Colour and Sugar Content of Grapes (Vitis vinifera L.). cv. Red Globe

Abstract

Studies on Effect of plant growth regulators to improve the colour and sugar content of Grapes” (Vitis vinifera L.).cv. Red Globe was conducted in the field of a progressive grape grower at Kaalampalyam (10 O 58’49.17” N and 76 O 55’ 15. 81”E and elevation of 1352 ft from MSL) near Perur area of Coimbatore district in Tamil Nadu. The experiment was laid out in a randomized Block design with 7 treatments and each treatment was replicated four times. The data recorded on various parameters viz., vegetative growth, flowering, fruit yield, Quality etc., were statistically analysed. Significant differences were observed among the growth regulators on various vegetative growth parameters in Grapes (Vitis vinifera L.). cv. Red Globe. Among all the treatments, number of bunches per vine was significantly higher when sprayed with ethephon 200ppm (T4) compared to other treatments. (6.53 cm), the berry size and berry weight of the grapes were found to be maximum in the bunches treated with CCC 500ppm (T2) (6.57 g), There was no impact on the number of seeds by the treatments. The ethephon 200ppm (T4) treatment exhibited superior quality in terms of juice content, total sugars and colour value.

Effect of Foliar Application of Gibberellic acid, Salicylic acid and Ammonium nitrate on Berry Quality of Ruby Seedless Grape Cultivar

“…Reducing sugars was not significantly affected in 1 st year and increased in the following year. The positive effects of SA application on reducing sugars have been noticed by Ahmed et al, 2018;Nanthakumar et al, 2021. The application of NH4NO3 led to a significant increase in reducing sugars. Our results also came on line with that reported by, Solhjooa et at., 2017 andBeerappa et al, 2019. On the other hand, (Pathania et al, 2018) found that NH4NO3 decreased reducing sugars.…”

“…Under the conditions of the current study, it could be found that SA alone significantly increased the anthocyanins in grape skin in the 1 st season, while in 2 nd led to slight increase compared with the control. The positive effects of SA application on grape quality have been noticed by Mahmoud, 2019 andNanthakumar et al, 2021. Probably due to the effect of SA on the expression and activity of PAL and other enzymes attached to the biosynthesis of these metabolites. After veraison, phenylalanine ammonia-lyase activity mostly focuses on the production of anthocyanin specifically in red cultivars than other phenolics.…”