Abstract:
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).
