Generation Mean Analysis for Blast Resistance and Yield Traits in Rice (Oryza sativa L.)

Namrata¹*, Singh RP¹, Ramlakhan Verma², Prashant Bisen¹, Prakash Singh³, Arsode Pandurang¹, Madhu Choudhry¹, Padma Thakur¹, Bapsila Loitongbam¹ and Ramesh4

1    Department of Genetics and Plant Breeding, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi-221005, India

2    Crop Improvement Division, ICAR-NRRI, Cuttack-753006, India

3    Department of Plant Breeding and Genetics, VKSCA, Bihar Agricultural University, Sabour, Dumraon, Buxar- 802136, India

4    Department of Genetics and Plant Breeding, College of Agriculture, Barmer Agricultural University, Baytu, Jodhpur- 344034, India

*Corresponding author Email: namratamotasara@gmail.com

Volume 18-(2), 2025   ;  https://doi.org/10.58297/QYBF5265   Click here for Pdf

Received: 12th July, 2025; Accepted: 9th September, 2025
 
Abstract

An investigation was performed to study the gene interactions for blast resistance and yield attributes in rice using six generations (P1 , P2 , F1 , F2 , B1 and B2 ) of cross HUR 3022 × Tetep. Results of scaling test, joint scaling test and digenic nonallelic interaction model with six parameters namely m, d, h, i, j and l indicated that the epistatic interaction model was appropriate to explain the gene action in all the fourteen traits under study. Mean and additive components were found highly significant for number of filled grains per plant, number of unfilled grains per plant, spikelet fertility percentage, grain yield per plant, area under disease progress curve and disease severity per cent. The dominance (h) gene effects were found highly significant for all the characters under study. All three types of gene effects (additive, dominance and epistasis) were found highly significant for blast resistance traits studied, except for additive effect in lesion number.

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