Stability of quality parameters of bread wheat (Triticum aestivum L.) genotypes under drought stress condition.

Change in amount and dis tribution of precipitation during grain filling period is one of the major limiting s tress factors of wheat quality and yield in Trakya region.Identification of the genetic s tability and development of good quality cultivars are very important issues for wheat production in the region.In the present research, it was inves tigated that the effects of various levels of drought s tress condition at different plant growth phase in quality parameters of bread wheat genotypes.This research was conducted in 2008-09 and 2009-2010 growing seasons.The experiment was es tablished with 15 genotypes in randomised complete block design with 3 replications.Drought treatments were on the main parcel and genotypes on the sup-plots.In the research; grain yield, 1000-kernel weight, tes t weight, protein content, hardness, wet gluten, gluten index and sedimentation value and also correlation among these characters with s tability parameters were inves tigated in wheat genotypes.According to results of the research; protein content, wet gluten content, hardness and sedimentation were negatively affected under irrigation condition during grain filling phase.Drought s tress condition at GS51-94 had a positive effect on protein content, wet gluten and hardness.The highes t tes t weight and 1000-kernel weight was determined under irrigation conditions.Non-treatment condition had a significant effect on sedimentation value.Based on s tability parameters genotypes Pehlivan, Aldane and BBVD7 well adapted to overall environmental conditions for 1000-kernel weight.For tes t weight cultivars Gelibolu, Kate A-1, and Pehlivan were well adaptable to overall environmental conditions.Aldane had higher sedimentation under fertile environmental condition.Evaluation of quality parameters and drought application Aldane was the bes t performing cultivar and limitation of irrigation during grain filling period had a positive effect on quality parameters except 1000-kernel weight and tes t weight.