Study of Yield and Effective Traits in Bread Wheat Recombinant Inbred Lines (Triticum aestivum L.) under Water Deficit Condition

The effects some traits on seed yield of recombinant inbred lines of wheat under water deficit stress was studied. This research was done at the Agricultural Research Stations, Islamic Azad University, Tabriz Branch in 2010- 2011. 28 recombinant inbred lines of wheat bread with two parents (Norstar and Zagros) in split plot experiment based on a randomized complete block design with three replications at two irrigation levels (70 and 140 mm evaporation from pan class A) were studied. Analysis of variance indicated a significant genetic differences in all traits under study among the lines. Lines No. 32, 163 and 182 produced highest yield under both irrigation levels. Number of spikes, grains per spike and harvest index had the highest positive correlation with grain yield. Path analysis based on stepwise regression showed that under the normal irrigation conditions, number spike (0.556), number of grains per spike (0.278), weight of 1000 grain (0.259) and the drought stress number spike (0.430), straw yield (0.276) and peduncle length (0.323) had the most direct and positive effect on yield respectively.