Genetic Analysis in F4 Generation of Three Crosses in Rice (Oryza sativa L.)

Author: Shaik Khaja Naimuddin and Govindarasu

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Abstract

In rice (Oryza sativa L.), a study was conducted at Pandit Jawaharlal Nehru College of Agriculture and Research Institute, Karaikal during rabi, 2017-18 to assess the genetic potentialities of F4 populations of three crosses viz., ADT 46 × IET 2226, CO 50 × AD 06207 and AD 07302 × AD 09399. Mean, variability, heritability, genetic advance, correlation, path analysis and parent-progeny regression analysis were studied for eight traits viz., days to flowering, plant height, panicles per plant, panicle length, panicle weight, grains per panicle, grain weight and grain yield. Among the three crosses, ADT 46 × IET 2226 and CO 50 × AD 06207 were found to be suitable crosses to provide good source populations for exercising an effective selection for progenies with high yielding ability, as these crosses registered high mean and greater genetic variability for grain yield and many of its component traits. Cross AD 07302 × AD 09399 was suitable for making selection of high yielding progenies combined with fine grain quality based on mean performance and variability. All the characters studied recorded high heritability in F4 populations of all the three crosses. However, combination of high heritability and high genetic advance was observed for grain yield, grains per panicle and grain weight, revealing the predominance of additive gene effects for these traits

Keywords

F4 population, Phenotypic variance, Genotypic variances, Heritability and Genetic advance

Conclusion

High magnitude of genetic variability was recorded in the F4 populations of crosses 1 and 2 and an exploitable amount of moderate genetic variability was found in cross 3 for grain yield. Moderate genetic variability was also available for panicle weight, grains per panicle and grain weight in all the three crosses, suggesting the higher efficiency of selection for improving these component traits as well as grain yield. Panicle length, days to flowering and plant height only in cross 1 and cross 3 expressed low variability in all the three crosses, inferring that selection may not be fruitful in improving these traits in the populations under study. High heritability combined with high genetic advances as per cent of mean was observed only for three traits viz., grain yield, grains per panicle and grain weight in all the three crosses, suggesting that these characters are predominantly controlled by additive gene action and improvement of these traits could be achieved through simple phenotypic selection in the F4 populations of all three crosses. Plant height and panicle length showed high heritability along with moderate to high only in cross 1 for plant height and genetic advance in F4 populations of the three crosses, while panicles per plant and panicle weight produced high heritability with high genetic advance in crosses 1 and 2, while in cross 3 these traits had high heritability with moderate genetic advance. These results suggest that selection for these traits would produce moderate to high genetic gain in the subsequent generation

References

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How to cite this article

Shaik Khaja Naimuddin and Govindarasu (2024). Genetic Analysis in F4 Generation of Three Crosses in Rice (Oryza sativa L.). Biological Forum – An International Journal, 16(10): 176-179