Effects of drought stress at flowering stage on seed yield and its components in local lentil accessions

In order to evaluate drought tolerance of lentil landraces at flowering stage, one split plot experiment in randomized complete block design with four replicates was conducted in agricultural faculty of Islamic Azad University of Tabriz in 2012-2013. Combined variance analysis showed genotype × drought stress interaction was significant in all investigated traits except to greening date, flowering date and plant height, which indicatesdifferent response of genotypes to drought stress for the studied traits. Three way interaction (year×genotype×drought stress) was not significant in all investigated traits, which indicates that drought stress for studied traits was similar in two years. Comparison of yield mean for genotype × drought interaction showed that all genotypes under drought stress had significant yield reduction in comparison with non-stress conditions, however, Shavi Varzeghan genotype in stress and non-stress conditions, showed better response than other genotypes. The drought tolerance indices(MP, GMP, HARM and STI) hadpositive and significant correlation with grain yield in stress and non-stress conditionsin both two years. Based on these indices, Kalaybar, Garadagh, Horand Danehriz, Dagh Qāyeh Gishlagy, Shavi Varzighan was identified tolerant genotypes to drought stress.