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Not AvailableFour grape rootstocks belonging to different Vitis species were planted in September. Rooting behaviour, polyphenol oxidase (PPO; EC 1.14. 18.1) activity and biochemical parameters were studied at different growth stages after planting the cuttings in polythene bags. Significant differences were recorded for rooting success among the different rootstocks, with the maximum sprouting percentage determined in the Freedom rootstock. The highest variation in PPO activity was also recorded in Freedom. High PPO activity was recorded in rootstock 140 Ru, while the highest root length was recorded in Dog Ridge. In the rootstock 110 R, the PPO activity was the lowest during the initial stage, though it increased up to 60 days after planting (DAP) and was then reduced up to 90 DAP. Increases in the number of rooting primordials were recorded in all the different rootstocks at different stages of growth. A higher number of rooting primordials was recorded in Freedom, and it was followed by 110 R. The present study suggests the differences in the rooting behaviour of the different rootstocks are based on PPO activity at regular time intervals up to 90 DAP.Not Availabl

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Not AvailableYield, raisin recovery and biochemical status of fresh grapes (Vitis vinifera L.) and raisins obtained from eight years old Thompson Seedless vines grafted on different rootstocks were studied. Higher yield (16.35 kg/vine) and raisin recovery (29.90%) was recorded in 110R rootstock and lowest in 1613-C rootstock (6.35 kg/vine). A higher total soluble solid of 21.530Brix was recorded in 1613-C rootstock grafted vines. The fresh grapes of own rooted vines had higher protein (7.84 mg/g), total phenols (0.88 mg/g) and reducing sugars (2.26 mg/g) whereas higher amount of carbohydrate (82.25 mg/g) was recorded in 110-R and starch (3.44 mg/g) in 99-R rootstock grafted vines. The raisins of 99-R rootstock grafted vines had higher starch (15.30 mg/g) and reducing sugar (6.80 mg/g), whereas higher protein in raisin was recorded in SO4 (28.50 mg/g), total phenols in 1613-C (3.18 mg/g) and carbohydrate in 110-R grafted vines (285.36 mg/g). The rootstocks, 1103P was also equally good in raisin recovery (29.36 %), yield (13.17 kg/vine) and carbohydrate accumulation (291.14 mg/g). Biochemical analysis of fresh grapes and dried grapes showed that the major biochemical constituent, viz. carbohydrate, reducing sugar, protein and phenolics concentrated in the raisin making process.Not Availabl

Kinetics of base catalysed <i>O</i>-acylation of hydroxamic acids

1983-1989The kinetics of O-acylation of hydroxamic acids using acetic anhydride as an acylating agent in non-aqueous medium, acetonitrile/dioxane has been investigated. The kinetic measurements have been carried out using spectrophotometric technique. The effect of tertiary amines, pyridine/triethyl amine on the rate of acylation has been reported. The O-acylation is found to be first order with respect to hydroxamic acids and first order with respect to acetic anhydride. Hence overall order of reaction is found to be two, which is in good agreement with the rate law. The effect of substituents on the rate of acylation, Hammett linear free energy relationship and the thermodynamic parameters are evaluated. The reaction products have been isolated and characterized. The probable mechanism of the acylation is proposed and rate expression is derived

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Not AvailableThe variations in growth, powdery mildew and anthracnose incidence and biochemical changes in Thompson Seedless grapevines grafted onto Dogridge and 110-R rootstocks in comparision to own rooted grape vines was investigated.Not Availabl