Multivariate Analysis for Early Genotypes of Garden Pea under Mid Hill condition of Himachal Pradesh

Author: Himani, Shivam Sharma, D.R. Chaudhary, Ankush Sharma and Ketan

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Abstract

The current study was conducted to assess yield and horticultural potency to identify the most promising 22 early genotypes of garden pea through multivariate analysis for 16 agro-morphological traits during rabi 2020-21 at CSK HPKV, Palampur. In the past, several high-yielding varieties of mid and late-maturing groups have been developed in the country but very little emphasis has been given for the development of high yielding early maturing genotypes as a result harnessing variability among pea genetic stock now-a-days became a major challenge for the pea improvement program. Mahalanobis D2 statistic grouped 22 genotypes into five clusters. Overall, cluster I was the largest, containing 8 genotypes while cluster IV was solitary having a single genotype. The highest intra-cluster distance was observed in cluster II while inter-cluster distances between cluster I and cluster IV depicted the presence of broad-spectrum genetic diversity. Based on cluster mean analysis, cluster III was found best for pod yield per plant. About, 66.9% variation was explained by the first five principal components with which ascorbic acid (PC1) was the maximum contributor towards genetic divergence followed by pod diameter (PC2), pod yield per plant (PC3), shelling percentage (PC4) and pods per plant (PC5). Hence, pea genotypes belonging to cluster III can be utilized to get higher yield through further heterosis breeding programs. In addition, hybridization between cluster I and cluster IV genotypes could get more recombinants in the segregating generations.

Keywords

Cluster means, diversity, inter-cluster distances, PCA

Conclusion

The highest inter-cluster distances indicated the presence of wide genetic diversity between the genotypes belonging to any two clusters than the genotypes within the cluster. Cluster III can be utilized to get higher yield through further heterosis breeding programs. The selection of genotypes based upon large cluster distances from all the clusters may lead to favorable broad-spectrum genetic variability, especially between cluster I and cluster IV, which could possibly get more recombinants in the segregating generations.

References

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How to cite this article

Himani, Shivam Sharma, D.R. Chaudhary, Ankush Sharma and Ketan (2022). Multivariate Analysis for Early Genotypes of Garden Pea under Mid Hill condition of Himachal Pradesh. Biological Forum – An International Journal, 14(4): 567-571.