Irrigation Regimes Effecting Drought Tolerance Of Grape Rootstocks Under Cold Arid Conditions

摘要

Abstract: The drought tolerance is a very important property of grapevine rootstocks. For that reason the breeding and selection of new rootstock varieties is focused on the evaluation of their drought tolerance. In this experiment, 5 rootstocks of grape were compared and evaluated with local rootstock. The maximum height of shoot was observed at scheduling of irrigation at 0.3 bar (66.80cm) in Doddridge while as maximum average height of shoot (61.96cm) was recorded for 1103-P and minimum average height of shoot (41.89cm) for Local rootstock with different scheduling of irrigations. Maximum diameter of shoot (4.35cm) was observed by 1613-C with scheduling of irrigation at 0.3 bar, where as Doddridge attained the highest average diameter of shoot (3.50cm) with different scheduling of irrigations. The maximum number of shoots per vine (19.42) was observed in 1613-C at 0.3 bar where as Local rootstock showed the minimum average number of shoots per vine (8.96) while as maximum average number of shoots per vine was observed for 1103-P (14.80) .Regarding the length of internode, 1103-P recorded the maximum length (7.41cm) at 0.3 bar and maximum average length of internode (7.01cm). The maximum relative leaf water content at scheduling of irrigation at 0.3 bar (84.6%), at 0.5 bar (79.3%) and at 0.7 bar (75.6%) was observed in 1103-P followed by Doddridge and Salt Creek. Based on the effect of different irrigation regimes on grape rootstocks, the drought tolerance of grape rootstocks can be ranked as 1103-P>Doddridge>Salt Creek>1613-C>1616-C>Local.