Parent progeny regression analysis in segregating generations of drought QTLs pyramided rice lines (Oryza sativa L.)
Abstract
The present study was undertaken to estimate the effectiveness of selection for the yield and yield contributing traits in the BC2F3 and BC2F4 generations of drought QTL introgressed progenies of Improved White Ponni (IWP) x Apo. A positively skewed and negatively skewed platykurtic curve was observed in many of the traits in both generations indicating the influence of a large number of genes. Significant and positive intergenerational correlation and regression coefficient values were obtained for all the yield contributing characters indicating that selection can be done in these generations for isolating superior genotypes. Narrow sense heritability estimates obtained high values for the traits days to 50 per cent flowering, the number of productive tillers, filled grains per panicle and single plant yield indicating that selection will be effective for these traits in these early generations.
Key words: Drought, parent progeny, regression, skewness, kurtosis, intergenerational correlation, heritability
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