Effect of intermating on genetic variability and character association in aromatic Rice (Oryza sativa L.)
Keywords: Aromatic rice (O. sativa L.)., Genetic variability, heritability, genetic advance, biparental mating, correlation co-efficient
AbstractBiparental mating (BIP) attempted in the F2 of a cross of P-1460 × P-1121 revealed that, the biparental progenies had better mean
performance as compared to F3 progenies for all the characters studied. In general, the lower limits of the range decreased for all the
characters in the biparental progenies widening the variability. The variation created on account of biparental mating was found to be
heritable as seen from increase in heritability estimates and genetic advance as per cent of mean. Highest value of genetic and
phenotypic coefficient of variation were recorded for yield / plant (34.00 and 35.21) followed by No. of spikelet’s / panicle (22.05
and 23.26). Test weight (g) and panicles / m2 exhibited high heritability and genetic advance (% as mean). The correlation coefficient
in biparental progenies are generally of higher magnitude than in F3 populations. Traits like, panicles/m2
, Spikelet’s/ panicle,
panicle length, test weight (g) and days to maturity showed significant correlation with yield / plant in biparental progenies. It was
also observed that, the non-significant negative association between panicles/m2 with yield / plant (g) in F3 changed to positive and
significant in BIP population. Similarly, non-significant positive association between days to 50% flowering, spikelet’s / panicle,
panicle length (g) and test weight with yield / plant in F3 got changed to positive and significant in BIP populations. These results
indicated that intermating in F2 was quite effective to break undesirable linkage.
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