Evaluation the genetic diversity of advanced lentil genoty pesunder the drought stress and non-stress conditions

To evaluate genetic diversity of advanced lentil lines, screening quantitative indices of drought resistance, and identifying drought resistant lines, 11 varieties, one advanced lentil line and one selected genotype from Ardabil local mass in a randomized complete block design (RCBD) with 3 replications under both stress (rain-fed) and non-stress (irrigated) conditions in the Station of Agricultural and Natural Research of Ardabil. Based on yields obtained under irrigation (YP) and rain-fed (YS) conditions, several quantitative drought tolerance indices, like mean productivity (MP), tolerance index (TOL), geometric mean productivity (GMP), harmonic mean (HARM), stress susceptibility index (SSI) and stress tolerance index (STI) were used to evaluate the drought responses of these genotypes. Evaluation of quantitative indices of drought resistance and considering the means quantities and correlation coefficients between such indices, based on grain yield and under both rain-fed and irrigated conditions indicated that indices (MP), (HARM), (GMP) and (STI) are considered as the best indices of Lentil genotypes response with stress intensity of (SI = 0.29) under drought stress. In 3-D graph, it has been showed that with considering these indices and grain yield and under rain-fed and irrigated conditions, genotypes ILL 6031, ILL 9893 and ILL 8095 will be as the produced highest seed yields and drought resistant lines in group A. Multivariate Biplot graph indicated that genotypes ILL 6031, ILL 9893 and ILL 8095 were located next to the vectors of drought resistance indices, as: MP, HARM, GMP and STI. Distribution of the genotypes in the Biplot space indicated the presence of genetic diversity among the lines for drought stress. Diagrams obtained from cluster analysis based on above indices showed that the farthest genetic distance in related to drought resistant lines with highest seed yields (ILL 6031, ILL 9893 and ILL 8095) and drought susceptible lines and lowest seed yields (ILL 8173, ILL 9832, ILL 1878 and ILL 8146)

Study on relations between relative water content, cell membrane stability and duration of growth period with grain yield of lentil genotypesunder drought stress and non-stress conditions

Drought is one of the most important abiotic stresses that limits crop production in arid and semi-arid regions of the world. Lentil (Lens culinaris L.), a valuable legume crop, is produced mainly rain-fed in Iran. An experiment was conducted to study the relationships between relative water content (RWC), cell membrane stability (CMS) and duration of growth period with grain yield of 11 advanced genotypes, varieties and a local genotype in the Ardabil Agriculture and Natural Resources research Station. Experimental design was a randomized complete block design (RCBD) with three replication under both rain-fed and irrigated conditions. Combined ANOVA showed significant differences among all the evaluated traits. Significant differences between characters reveals that there are high variation between the traits studied. Means for characters under study showed that grain yield, RWC, CMS and duration of growth period decreased in rain-fed condition but cell membrane leakage (electric conductivity) increased. Correlation coefficients showed strongly positive relation between grain yield with RWC (r0.98**), strongly negative and non significant CMS (r-0.32ns) and strongly negative relation between grain yield and the days to maturity (r-0.78**). The results of the experiment also revealed that there weren’t a strong relation between yield and calculated attributes for drought tolerance except RWC. Therefore, this character could be effective in evaluation of drought tolerance and identification of high yielding genotypes (ILL 6031, ILL 9893 and ILL 8095)