volume 40 issue 3 (september 2006) : 157 - 163
CORRELATION BETWEEN THE GENETIC DISTANCE AMONG GENOTYPES BASED ON MOLECULAR MARKER IN RICE HYBRIDS
1Tamil Nadu Agricultural University, Coimbatore, India
ABSTRACT
The level of genetic diversity between two parents based on RAPD analysis has also been
proposed as a possible prediction of F1 performance and heterosis in rice. The similarity index was
maximum (81.3 per cent) between IR62243R Vs IR53466R and minimum was observed between
IR65509R Vs IR58025A (60.6 per cent). The high similarity index between the genotypes IR53466R and IR62243R revealed that they are more closely related. Based on the cluster analysis the band sharing data grouped the 12 parents into three major groups. The genetic distances among the parents ranged from 0.187 (IR53466R Vs IR62243R) to 0.394 (IR58025A Vs IR65509R). The highest genetic distance between IR58025A and IR65509R revealed their distinctiveness. This may be due to their diverse ancestral origin. Simple correlation coefficients (r) ranged from 1 - 0.596 (days to 50 per cent flowering for heterobeltiosis) to 0.462 (spikelets per panicle for relative heterosis). Genetic distance showed a significant positive correlation with high relative heterosis for spikelets per panicle suggesting that the selection of parental genotypes
proposed as a possible prediction of F1 performance and heterosis in rice. The similarity index was
maximum (81.3 per cent) between IR62243R Vs IR53466R and minimum was observed between
IR65509R Vs IR58025A (60.6 per cent). The high similarity index between the genotypes IR53466R and IR62243R revealed that they are more closely related. Based on the cluster analysis the band sharing data grouped the 12 parents into three major groups. The genetic distances among the parents ranged from 0.187 (IR53466R Vs IR62243R) to 0.394 (IR58025A Vs IR65509R). The highest genetic distance between IR58025A and IR65509R revealed their distinctiveness. This may be due to their diverse ancestral origin. Simple correlation coefficients (r) ranged from 1 - 0.596 (days to 50 per cent flowering for heterobeltiosis) to 0.462 (spikelets per panicle for relative heterosis). Genetic distance showed a significant positive correlation with high relative heterosis for spikelets per panicle suggesting that the selection of parental genotypes
KEYWORDS
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Indian Journal of Agricultural Research
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