Combining ability of rice genotypes under coastal saline sitution

Abstract

Six lines and five testers were crossed in line x tester fashion and F1 's were evaluated under coastal situation. The ratio between the estimates of additive and dominance variance indicated preponderance of non-additive gene action for all characters studied namely plant height, productive tillers, boot left length, panicle length, grain weight/panicle and grain yield/ plant. Among the parents, ADT 45 recorded significantly superior grain yield/plant and panicle length. This was followed by Swarna and Paiyur I for grain yield /plant. Line parent TKM 11 recorded superior mean for boot leaf length, panicle length and grain weight/panicle. Among the line parents ADT 45 and TKM 11 showed good combining ability for grain yield/plant, panicle length and grain weight/ panicle. It indicates the existence of relationship between per se and gca of parents to certain extend. Among the hybrids, ADT 45 X Vandana, ADT 45 X Nootripathu, ADT 45 X Norungan, ADT 45 X PMK 2, TKM 11 X Vandana, TKM 11 X Nootripathu, TKM 11 X Norugan. TKM 11 X MDU 5, TKM 11 X PMK 2 and Paiyur 1 X PMK 2 recoded significantly superior grain yield/ plant and grain weight/ panicle. With regard to specific combining ability effect, all the superior hybrids recorded additive gene action except ADT 45 X Nootripathu for which additive type epistasis observed. Hence these crosses could be subjected to pedigree breeding to evolve high yielding genotypes for coastal saline situations

DOI

https://doi.org/10.29321/MAJ.10.100746

Pages

169 - 175

Creative Commons

Copyright

© The Author(s), 2025. Published by Madras Agricultural Students' Union in Madras Agricultural Journal (MAJ). This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the original work is properly cited by the user.

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