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

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-PDoddridgeSalt Creek1613-C1616-CLocal.