اثر تنش خشكي بر عملكرد دانه ، برخي از اجزاي عملكرد و شاخص هاي مقاومت در ژنوتيپ هاي جو لخت

Effect of drought stress on yield, yield components and resistance indices of Hull-less Barley genotypes

In order to study the effect of drought stress on yield, components of yield and resistance indices of five hull-less barley genotypes (Hordeum vulgare L.), a field experiment was carried out with a silty clay loam texured soil at the Chamkhani Agricultural Experimental Station, situated at 15 km of western south of Yasudge, Iran in 2000-2001. The experimental design was split plot with three replications. Four irrigation levels were allocated to main plots, and five hulls-less barley genotypes (FICC0963, FICC 1570, FICC1571, FICC 1725, and FICC2712) to sub-plots. The irrigation levels consist of: adequate irrigation untill tillering (23 of the Zadoks code) (II), stem elongation (33 of the Zadoks code) (12), anthesis (65 of the Zadoks code) (I3), and physiological maturity (I4) of hull-less barley genotypes. The total dry matter, yield and yield components were affected by irrigation levels. Impose of drought stress at anthesis stage did not decrease grain yield significantly. The amount of grain yield for I1 and I2 were 224 and 312 g m-2, respectively. Based on the stress tolerance index, the EICC2712 genotype was identified as the most stable in grain yield.