Clustering of yardlong bean lines and cultivars grown under a drought condition
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Abstract
The effect of drought stress significantly influences yield improvement and declining crop production. Therefore, this experiment aimed to the group and select 25 genotypes of yardlong bean lines and cultivars grown under drought-stress conditions. They were laid out in a randomized complete block design with 3 replications under the water-constrained condition in a rainproof greenhouse. Yield/plant and other 12 horticultural traits were recorded, and multivariate analyses were conducted to assess genetic divergence using Mahalanobis D2 statistics, and the genotypes were grouped into clusters following Tocher’s method. The results showed that yardlong bean lines and cultivars grown under drought were classified into 7 clusters. Clusters I – VII contained 6, 10, 2, 2, 1, 3 and 1 genotype (genotypes), respectively. The inter-cluster distance (D2) was found to be the maximum between clusters V and VII (52.27), and the same was the minimum between clusters I and IV (11.21). Pod width contributed maximum to the total divergence followed by yield per plant and leaf greenness (SPAD) (22.00, 17.67 and 12.33 %, respectively). Therefore, the clustering of genetic divergence, in selecting lines from crossing between genotypes of clusters V and VII, can achieve high gains of selection and high-yielding lines for planting in drought conditions.
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