سیEvaluation of adaptation and drought stress indices in advanced bread wheat genotypes

Subject Areas : Journal of Plant Ecophysiology

Habiballah  Soughi ¹ (Assistance of professor of Horticulture Crops Research Department, Golestan Agricultural and Natural Resources Research and Education Center)

Received: 2016-08-10 Accepted : 2017-09-19 Published : 2018-12-27

Keywords: Stability, Drought stress, Grain yield, Wheat, promised line,

Abstract :

Drought stress is one of the most important factor that reducing wheat (Triticum aestivum L.) yield production in arid and semi-arid regions.  In order to evaluate stability and  indicators of drought tolerance indices in wheat, twenty bread wheat genotypes were planted in randomized complete block design with three replications at Gorgan  Agricultural Research Station  in three years. Genotypes in two years (2012-13 & 2013-14 cropping season) were evaluated only in irrigated condition but in 2014-15 cropping season, both in irrigated and drought after flowering. Eight indices under normal and drought stress conditions including, stress sensitivity index (SSI), tolerance (TOL), geometric mean production (GMP), mean production (MP), stress tolerance index (STI), yield stability index (YSI), yield index (YI) and preference index (PI) on the grain yield, were evaluated.  Results of combined analysis of variance revealed that effects of year and  genotype were statistically significant in 1% level but year × genotype interactions. Drought stress caused reducing in grain yield that genotype number 6 with 70% had the highest decreasing. Genotypes number 8, 17, 4 and 14 had the highest grain yield in drought stress. In base of mean comparison of genotypes in combined analysis of variance and indicators of drought tolerance, genotype number 14 with grain yield mean 6773 kg/ha in irrigated conditions and genotypes number 8 and 17 in drought condition were selected.

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