Genetic divergence studies in cluster bean genotypes

Abstract

The present experiments were carried out at Department of Horticulture, Dr. PDKV, Akola and Regional Research Centre, Amravati during the years 2013-14 and 2014-15. Fifty five genotypes of cluster bean were assessed for genetic divergence using Mahalanobis D2 technique. Among the characters studied in all four environmental conditions, gum content in seed (63.50%), plant spread (17.17%), number of primary branches per plant (4.65%), days to first flower (3.77%), hundred seed weight (2.09%), days to 50 % flowering(1.95%), seed to husk ratio (1.68%) and ten dry pod weight (1.35%) contributed 95 percent to the total divergence. Genotypes were grouped into 8 clusters using Tocher’s method. Cluster V was the largest group, involving 17 genotypes followed by twelve genotypes were grouped in cluster IV, eleven genotypes in cluster III and six genotype each in cluster I and II. The remaining solitary clusters (VI, VII and VIII) contained only one genotype each. The genotypes from the solitary clusters showed high divergence and useful in breeding. The intra-cluster distance ranged from 0 to 9.15. Cluster V possessed the highest intra-cluster distance (D2=9.15), followed by cluster IV (D2=6.34), cluster III (D2=4.71), cluster II (D2=3.31), and cluster I (D2=2.65). The clusters comprised of only one genotype had zero intra-cluster distance (cluster VI to VIII). The average inter-cluster distance reveled the maximum divergence(D²) between cluster V and VIII (D²=37.26) followed by cluster III and V (D²=29.92), cluster VI and VIII (D²=25.51). On the basis of inter cluster distance and performance observed in the present study a breeding programme involving genotypes for a specific character has been selected using cluster mean.

Stability Analysis of Yield and Yield Attributing Traits of Promising Genotypes of Cluster Bean [Cyamopsis Tetragonoloba (L.) Taub.]

“…Genotype x environment interactions and linear component of G × E interaction were highly significant for most of important traits viz., plant height (cm), days to maturity, pod weight (g), number of pods per plant, pod yield per plant(g) and pod yield per hectare (q/ha), protein content (%), gum content (%) and fibre content (%). Similar results of significant G x E interactions were also been observed by Pereira et al (2009) in 16 varieties of french bean; for plant height (cm), pod yield per plant(g) and pod yield per hectare (q/ha), gum content (%) and protein content (%) in cluster bean by Wankhade et al (2016) ; for plant height (cm) and number of pods per cluster and days to maturity in cluster bean by Pawan et al (2016). Whereas, it was non-significant for number of branches per plant, days to first flower, days to 50% flowering, number of clusters per plant, pod length (cm) and number of seeds per pod.…”

“…Four genotypes IC-9077-P1, IC-10323, IC-28287 and IC-200696 had higher mean performance with regression values more than unity and non significant deviation from regression line indicating their suitability for favourable environments with below average stability. Similar interactions for this trait are reported earlier in cluster bean (Jain et al, 2012, Wankhade et al, 2016and Satish et al 2017.…”

“…This revealed that the environments were affecting the performance of all the genotypes with respect to cluster bean yield attributing traits. Wankhade et al (2016) observed significant E + (G × E) interaction for plant height (cm), number of pods per plant, gum content (%) and protein content (%) in cluster bean genotypes. Genotype x environment interactions and linear component of G × E interaction were highly significant for most of important traits viz., plant height (cm), days to maturity, pod weight (g), number of pods per plant, pod yield per plant(g) and pod yield per hectare (q/ha), protein content (%), gum content (%) and fibre content (%).…”

Studies on genetic diversity for yield, quality and yield attributing traits in cluster bean [Cyamopsis tetragonoloba (L.) Taub.] genotypes

“…On contrary plant height, internodal length, days to 50% flowering, the average weight of 50 pods and pod yield per plant did not contribute towards genetic divergence. These results were in accordance with the findings of Choyal et al (2017), Wankhade et al (2017) and Rishita (2018) in cluster bean genotypes. Apart from genetic divergence, due importance should be given to the performance of character with a maximum contribution towards divergence.…”

Genetic divergence analysis in chickpea germplasm

“…Selecting parents from the maximum et al, 2002;Kumar et al,2017). Similar result has been reported by Dwevedi and Lal, (2009); Syed et al, (2012) in chickpea; Arya et al, (2017) in wheat, Gowsalya et al, (2017) in black gram, Wankhade et al,2017 in clusterbean. According to Temesgen et al, (2015) increasing parental distance implies a great number of contrasting alleles at the desired loci and then to the extent that these loci recombine in the F 2 and F 3 generation following a cross of distantly related parents, the greater will be the opportunities for the effective selection for yield factors.…”