Study on Drought Tolerance Indices in a Doubled Haploid Population of Bread Wheat (Triticum aestivum)

Plant tolerance to water stress is affected by environmental parameters, plant genotype and their interactions, hence yield under stress conditions may not be useful considence for screening of genotypes. To introduce efficient drought tolerant indices in bread wheat a double haploid population including 82 DH lines and their parents were studied in this research. A greanhouse experiment under two drought stress and optimum moisture conditions conducted using RCBD with three replications. Combined analyse of data showed variation among genotypes response to water stress and also there was no relationship between yield under stress and non stress conditions. HARM, STI, GMP and MP showed high and significant correlation with yield under both conditions and were efficient in screening of genotypes. Principal components analysis of the data revealed ability of this statistical procedure to reduce the size of large amount of data. The first and second component explained 96.2% of the total variation. Distribution of genotypes in biplot constructed by the first and the second principal components introduced Pavan, DH4, DH70, DH71, DH34 and DH30 as the tolerant genotypes with high grain yield under both conditions, also DH79, DH82, DH53, DH75 and DH26 as the susceptible genotypes to drought stress.