GENE ACTION AND GENERATION MEAN ANALYSIS FOR YIELD AND ITS COMPONENT TRAITS IN INDICA RICE (Oryza sativa L.)

R.K. SINGH¹, R.P. SINGH², P. SINGH³*, R.L. VERMA⁴, O.N. SINGH^5
1Department of Genetics and Plant Breeding, Institute of Agriculture Sciences, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India ; Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, 753006, Odisha, India
²Department of Genetics and Plant Breeding, Institute of Agriculture Sciences, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India
³Department of Genetics and Plant Breeding, Institute of Agriculture Sciences, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India; Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, 753006, Odisha, India; Department of
⁴Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, 753006, Odisha, India
⁵Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, 753006, Odisha, India; Plant Variety Protection Appellate Tribunal, Intellectual Property Appellate Board, Guna Complex Annex-I, Anna Salai, Teynampet, Chennai, 600018, India
* Corresponding Author : prakash201288@gmail.com

Received : 05-12-2019     Accepted : 20-12-2019     Published : 21-12-2019
Volume : 11     Issue : 12       Pages : 684 - 688
Genetics 11.12 (2019):684-688

Keywords : Blast, Epistasis, Disease resistance, Rice and Quantitative traits
Academic Editor : Vipul N Kapadia
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are thankful to Indian Council of Agricultural Research (ICAR), Government of India, for awarded Senior Research Fellowship for his Ph.D. research work at Banaras Hindu University, Varanasi. Authors are also thankful to Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, Odisha for providing required facilities to support this work. Authors are also thankful to Department of Genetics and Plant Breeding, Institute of Agriculture Sciences, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India
Author Contribution : All authors equally contributed

Blast disease of rice (Oryza sativa L.), caused by the fungal pathogen Pyricularia oryzae (synonym of Magnaporthe grisea) is a serious threat to rice production. Six generations including three segregating populations viz., F2, B1 and B2 of a cross between a popular high-yielding blast susceptible cultivar i.e., HUR 4-3 with Tetep (blast resistant genes Pi1 and Pi54) were used during 2014-15 and 2015-16 for the study the nature and magnitude of gene action for disease reaction and yield attributing traits through generation mean analysis. The mean performances of the six generations (viz., P1, P2, F1, F2, B1 and B2) on 11 quantitative and four qualitative traits were used for the analysis of scaling test and generation mean. In scaling test, the values of scale A and B were showed significance for most of traits which will indicate the non-allelic interaction. The complementary interaction was showed for plant height, spikelet fertility, grain yield per plant and head rice recovery. While, the remaining other traits were showed duplicate epistasis. Among the genotypes tested under epiphytotic conditions, lines may be carried of resistant genes were highly resistant to blast disease as compared to individuals with single and/or minor or absence of both resistance genes. It indicates the non-allelic gene interaction and has a duplicate effect when both resistant genes present together. The information on epistatic interaction of various yield contributing traits and disease resistance will further assist rice plant breeders for choosing appropriate breeding strategy for blast resistance and yield enhancement.

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