Comparision of Lentil Landrace Genotypes for Grain Yield and its Component under Drought Stress and The Effects of Drought and Salinity stresses on Genotypes at their Vegetative Stages

Salinity and drought are known as the most important abiotic stresses to reduce the growth and development of crops. To evaluate drought tolerance of lentil landrace genotypes at flowering stage, a split plot experiment based on randomized complete block design with four replications was conducted at the Agricultural Faculty of Islamic Azad University, Tabriz branch, during 2012-2013. Combined variance analysis of data showed that genotype × drought stress interaction was significant for all traits under study. This indicates different response of, genotypes to drought stress for these traits. Mean comparison of yield for genotype × drought interaction showed significant yield reduction for all genotypes under drought stress as compared to non-stress conditions. However, Shavi Varzeghan genotype under both stress and non-stress conditions, showed better response than other genotypes. To evaluate tolerance of of lentil landrace genotypes to salinity and drought stresses, a factorial experiments based on completely randomized design with three replications was conducted in 2013 at the greenhouse of Tabriz Azad University. Factors in this experiment were: drought stress at two level (control and irrigation for 50% of field capacity); two salinity levels (control and 4 ds/m salinity) and 7 lentil landrace genotypes. Analysis of variance showed that three way interactions of genotype ×drought × salinity was significant only for root length which indicates different response of genotypes for this trait for salinity and drought stresses. The effect of salinity and drought stress levels on all traits was significant which indicates reduction in traits value under salinity and drought stresses.Estimation of simple correlation among traits showed that, shoot length and number of shoot correlated pasitively with shoot dry weight and root dry weight with root length and number of lateral roots. Cluster analysis divided genotypes into two clusters. The second cluster consisted to Kaleybar, Horand and ShaviVarzeghan genotypes. These genotypes were tolerant as compared to the other genotypes during vegetative growth stage.The regression and path analysis for shoot dry weight showed number of lateral roots had the highest direct and indirect effect on shoot dry weight under drought and salinity stress. Cluster analysis of traits, divided genotypes into two clusters. The second cluster were Kaleybar, Horand and Shavi Varzeghan genotypes. These genotypes had higher mean values for the traits under study and could be tolerant genotypes for drought and salinity stresses at vegetative growth stage.