Evaluation of Wheat Recombinant Inbred Lines for heat tolerance and variability
Twenty two heat tolerant recombinant inbred lines (RILs) of wheat derived from crosses viz: AAI12 x K9162 and AAI12 x K8962 were developed through disruptive seasonal selection. These heat tolerant lines along with two check varieties (NW 1017 and HD 2733) were raised during Rabi-2013-14 in RBD design. The data obtained in the present investigation were analysed to compute the coefficient of variation, heritability, genetic advance, correlation between grain yield and sixteen component traits and physiological traits of wheat. Analysis of variance revealed significant difference among genotypes. On the basis of per se performance for grain yield per plant, genotypes RLW 3, 7, 13, 5 and 15 were found promising. High estimates of genotypic coefficients of variation (GCV) and phenotypic coefficients of variation (PCV) were obtained for canopy temperature depression, chlorophyll content and membrane stability. High estimates of heritability were recorded for all characters studied. High heritability along with moderate genetic advance was registered for plant height, grain filling period, grains per spike and test weight. Suggesting sufficient variability and thus scope for genetic improvement through selection for these traits. Estimates of correlation co-efficient exhibited highly significant positive correlation with number of grains per spike, spike weight, spike length, canopy temperature depression, tillers per plant, grain filling period and chlorophyll content. Therefore this character may be used as an index for selection to higher yield in wheat genotype. However it was found to be negatively significant correlation of yield with plant height was observed.
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