Statistical Modeling of the Effect of Physio-Biochemical Parameters on Water Use Efficiency of Grape Varieties, Rootstocks and Their Stionic Combinations under Moisture Stress Conditions

Authors : J. SATISHA, G.s. PRAKASH, R. VENUGOPALAN

Pages : 261-271

View : 10 | Download : 6

Publication Date : 2006-07-01

Article Type : Research Paper

Abstract :The effect of various physio-biochemical parameters on the water use efficiency insert ignore into journalissuearticles values(WUE); of grape varieties, rootstocks and budded vines was studied in 3 separate experiments at 3 levels of irrigation insert ignore into journalissuearticles values(100%, 50% and no irrigation); for 14 days of stress cycle. None of the varieties or rootstocks could survive beyond 4 days under the no irrigation treatment. Considerable genetic variability was observed for WUE with respect to photosynthetic rate, transpiration rate, stomatal conductance, root to shoot length ratio, abscisic acid, zeatin riboside, carbon isotope discrimination etc. among grape rootstocks, viz., Dogridge, 1613 C, Salt Creek, St. George and Vitis champinii insert ignore into journalissuearticles values(VC); clone, and varieties, viz., Flame Seedless, Thompson Seedless, Sharad Seedless and Tas-A-Ganesh under 50% moisture stress. Among the rootstocks Dogridge was the most efficient water user, followed by Salt Creek and VC clone, while among the varieties Flame Seedless was the most efficient water user, followed by Thompson Seedless and Sharad Seedless at 50% moisture stress. Sharad Seedless on its own root, which was the least efficient water user under 50% soil moisture stress, increased its WUE when budded on efficient water using rootstocks like Dogridge and Salt Creek. A strong positive correlation was observed between WUE and photosynthetic rate, stomatal conductance, root to shoot length ratio and abscisic acid, while a negative correlation was observed with cytokinin and transpiration rate. The regression model revealed photosynthetic rate and transpiration rate as the major contributing factors for variation in WUE of rootstocks, varieties and budded grape vines under moisture stress conditions.
Keywords : Grape, varieties, rootstocks, budded vines, water use efficiency, correlation, regression model, abscisic acid