Study of Advance Generation Lines in Mutant × Basmati Crosses of Rice

摘要

Twelve cross-combinations of aromatic rice involving four induced mutants 88-8-3, 33-9-15,rn124-17-4 and 21-6-1 of local aromatic tall indica cultivars Tulaipanja and Gobindabhog and threernbasmati varieties were made to develop high yielding varieties with basmati type grain qualityrnsuitable for cultivation in eastern India. Four selected lines advanced to F6 generation werernevaluated for mean performance, variability, heritability and genetic advance. The differencernbetween the values phenotypic coefficient of variation (PCV) and genotypic coefficient of variationrn(GCV) was low in all the eight quantitative characters studied indicating influence of genetical factorrnin controlling these traits. High heritability indicating less environmental influence along withrnmoderate genetic advance, PCV and GCV were observed for all the traits viz., plant height, paniclernnumber per plant, panicle length, filled grains per panicle, grain length, grain length/breadth ratio,rntest weight and grain yield per plant. The results indicate high genetic infirmity in these four selectedrnlines of F6. All the four lines have basmati type grain dimension associated with characteristic aromarnof basmati varieties and have considerable higher yield than their respective parents. Development ofrnsuch lines will create genetic diversity with respect to the gene sd1 and reduce genetic underbility.rnThis will help in sustaining high yield of the selected lines and crop production.