Genetic variability and character association studies of wild rice (Oryza nivara and Oryza rufipogon) germplasm for yield and yield-related traits
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Authors
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Ganesh Kumar Koli
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Sneha Gupta
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Gayatri Kumawat
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Manish Kumar Choudhary
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Bapsila Loitongbam
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PK Singh
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B Sinha
Keywords:
Genetic variability, heritability, character association, path analysis and riceAbstract
The present study evaluated 40 late-maturing wild rice germplasm lines obtained from the National Research Center on Plant Biotechnology, New Delhi. The germplasm lines were assessed at Banaras Hindu University, Varanasi during the Kharif seasons of 2019 and 2020 to estimate genetic parameters for 12 yield and yield-related traits. Analysis of variance revealed highly significant differences among genotypes for all traits, indicating the presence of considerable genetic variability. The highest genotypic and phenotypic coefficients of variation (GCV and PCV) were observed for total grain yield per plant, followed by panicle weight. Total grain yield per plant exhibited the highest heritability estimate, followed by total grain number per panicle. Genetic advance, expressed as a percentage of the mean, was highest for plant height, while grain number per plant and filled grains also showed relatively high values. Correlation and path coefficient analyses indicated that filled grains per panicle and panicle weight had strong positive effects on grain yield. Therefore, these traits may serve as reliable selection criteria for yield improvement in rice breeding programs. Among the evaluated genotypes, WRG(NKS)-440, WRG(NKS)-434, and WRG(NKS)-421 consistently exhibited superior performance for yield and yield-related traits and may serve as promising parental lines for hybridization aimed at improving grain yield in rice.
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