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Genetic variability, character association and genetic divergence in groundnut (Arachis hypogaea L.) accessions

DOI: 10.18805/LR-4123    | Article Id: LR-4123 | Page : 164-169
Citation :- Genetic variability, character association and genetic divergence in groundnut (Arachis hypogaea L.) accessions.Legume Research.2021.(44):164-169
Monisha Mitra, Saikat Gantait and Rajib Kundu saikatgantait@yahoo.com
Address : Department of Genetics and Plant Breeding, Faculty of Agriculture, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia-741 252, West Bengal, India.
Submitted Date : 24-01-2019
Accepted Date : 20-03-2019

Abstract

Present investigation was conducted in 31 groundnut accessions to assess genetic divergence, characters association involving 13 quantitative characters  and path coefficients in order to identify superior accessions exhibiting higher genetic diversity. Number of pods/plant, secondary branches, kernel width, and pod yield displayed a higher level of coefficient of variation both at phenotypic and genotypic level. Genetic advance with higher heritability indicated preponderance of additive variance for pod length, pod yield, and number of pods/plant. Number of secondary branches, kernel width, pod length, and number of pods/plant revealed significant positive correlation with pod yield. Path coefficient analysis revealed exertion of high positive direct effects on pod yield through pod length, kernel width  and number of pods/plant. Cluster analysis exhibited substantial diversity among 31 accessions forming 13 clusters. Two clusters [X (two accessions) and XII (one accession)] showed the largest distance, which suggests hybridization between these accessions to achieve high level of heterosis for further exploitation. Five accessions viz., TAG-24, TG-69, ICGV-02005, TG-73 and TG-80 were identified as the most divergent for future use.

Keywords

Cluster analysis Genetic advance Heritability Mahalanobis D2 Path analysis Squared Euclidian distance.

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