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Please use this identifier to cite or link to this item: http://www.erepo.iihr.ernet.in/handle/123456789/309

Title: Studies on genetic variability in water use efficiency of grape varieties, rootstocks and their stionic combinations
Authors: J, Satisha
Guide/Chairperson: G S, Prakash
Keywords: genetic
variability
rootstocks
stionic combinations
Issue Date: 2005
Year of Submission: 2005
Abstract: Four grape varieties namely Flame Seedless, Thompson Seedless, Sharad Seedless and Tas-a-Ganesh of six month old plants were subjected to three levels of moisture stress viz., control, 50% stress and 100% stress for 14 days. There was marginal reduction in photosynthesis and greater reduction in transpiration with increased water use efficiency (WUE) in all the varieties from control to 50% stress. None of the varieties could survive beyond 3-4 days at 100% stress. Among the varieties Flame Seedless had highest WUE followed by Thompson Seedless at 50% stress. A nine fold increase in abscises acid content was observed in Flame Seedless at 50% stress than at control while it was about 1-3 fold in other varieties. Reduction in cytokinin content was observed with increased moisture stress. Root to shoot length ratio (RSLR) and root to shoot dry matter ratio (RSDWR) was maximum in Flame Seedless and was least in Tas-a-ganesh at 50% moisture stress. Under similar set of experiments with five grape rootstocks namely Dogridge, 1613 C, Salt Creek, St. George and VC clone, Dogridge and salt Creek maintained higher water potential and osmotic potential (less negative values) under increased moisture stress indicating their better osmotic adjustment to maintain higher heater content. Higher WUE was observed in Dogridge and Salt Creek at 50% moisture stress as a result of marginal reduction in photosynthesis and greater reduction in transpiration rate. Higher ABA content accumulated in Dogridge with increased moisture stress resulted in reduced stomatal conductance thus minimizing transpiration rate. A three fold increase in RSLR was observed in Dogridge from non-stress to stress conditions while there was no much increases in other rootstocks. Reduced shoot length in Dogridge was attributed to less cytokinin content under soil moisture stress. Dogridge rootstock influenced the photosynthesis behaviour of Flame seedless and Sharad Seedless when they were budded on it. Sharad Seedless recorded maximum WUE when budded on Dogridge followed by Flame Seedless on Dogridge at 50% moisture stress. Flame seedless and Sharad Seedless budded on Dogridge recorded highest ABA accumulation at 50% moisture stress than when they are budded on Salt Creek and VC clone. Rootstocks strongly influenced the carbon isotope discrimination of scion varieties budded on them.
URI: http://www.erepo.iihr.ernet.in/handle/123456789/309
University in which they received their degree: University of Agricultural Sciences, Bangalore
Degree Level: Ph.D
Appears in Collections:DIVISION OF FRUIT CROPS

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