Effect of intermating on genetic variability and character association in aromatic Rice (Oryza sativa L.)

• Main Author: N.R. Koli and S.S. Punia
• Format: Article
• Language: English
• Published: Indian Society of Plant Breeders 2012-06-01
• Series: Electronic Journal of Plant Breeding
• Subjects: Aromatic rice (O. sativa L.).; Genetic variability; heritability; genetic advance; biparental mating; correlation co-efficient
• Online Access: https://sites.google.com/site/ejpb2011/vol-3-2/Vol-3-2-830-834.pdf?attredirects=0

Biparental 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 / m2exhibited 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.