GENETIC ANALYSIS TO ASSESS THE PARENTAL LINES FOR BIOMETRICAL TRAITS IN RICE (Oryza sativa L.)

D.R. GANGAPUR¹*, S. MAGADUM², K. SALINI³, K. THIYAGARAJAN^4
1Centre for Plant Breeding and Genetics, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
²Moriculture Section, Regional Sericultural Research Station, Central Silk Board (CSB), Miran Sahib, Jammu, 181101, Jammu & Kashmir, India
³Division of Crop Sciences, ICAR-Central Research Institute for Dryland Agriculture (CRIDA), Santoshnagar, Hyderabad, 500059, Telangana, India
⁴Centre for Plant Breeding and Genetics, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
* Corresponding Author : db4334@gmail.com

Received : 03-12-2019     Accepted : 27-12-2019     Published : 30-12-2019
Volume : 11     Issue : 24       Pages : 9313 - 9319
Int J Agr Sci 11.24 (2019):9313-9319

Keywords : Rice hybrids, Parental lines, Per se performance, Combining ability, Yield traits
Academic Editor : Dr PK Mishra, Dr Namburi Hari Satyanarayana
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are thankful to Centre for Plant Breeding and Genetics, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
Author Contribution : All authors equally contributed

The study was conducted to estimate mean performance and general combining ability effects of parents with an objective to develop highly heterotic heat tolerant rice hybrids. The investigation was carried out by using four diverse CGMS lines and 50 tester parents in the hybridization process and 200 hybrids were developed by following line x tester mating design. Analysis of variance for combining ability revealed significant differences among lines and testers. Among the CGMS lines, TNAU CMS 2A showed significant desirable gca effects for earliness, plant height, number of productive tillers per plant, panicle length, spikelet fertility and 100 grain weight and another CGMS line IR 68897A revealed significant desirable gca effects for earliness, number of spikelets per panicle, number of filled grains per panicle and gain yield per plant. Eight testers viz., CB00-13-84, CB00-13-55, CB00-13-39, CB00-13-171, CB00-14-65, CB00-13-106, CB00-14-81 and CB00-13-133 were good general combiners for earliness. The genotypes COMS 23A, TNAU CMS 2A, IR 8, CB00-13-113, IR 36, HTL 31, HTL 25, HTL 32 and BALILLA were good general combiners for plant height indicating the presence of favourable alleles for desirable plant height. The CGMS line COMS 24A was found to be a good general combiner for number of productive tillers per plant, number of spikelets per panicle, number of filled grains per panicle, 100 grain weight, grain yield per plant. The tester CB00-14-56 was a good general combiner for number of spikelets per panicle, number of filled grains per panicle, spikelet fertility. The other testers CB00-14-82 and CB00-13-97 were good general combiners for panicle length, spikelet fertility, 100 grain weight. The genotypes COMS 24A, CB00-13-55 and CB00-13-126 were found to be the good general combiners for grain yield. The lines and testers showing significant and desirable combining ability effects were associated with better per se performance for the respective traits.

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