Genetic divergence in forage sorghum (Sorghum bicolor L. Moench)

Abstract

Thirty genotypes of forage sorghum were studied for generating information on nature and magnitude of genetic variability and diversity for designing breeding programme. The experiment was conducted in randomized complete block design in three replications. The data were recorded on days to 50% flowering, plant height, leaf breadth, leaf length, leaf area, stem girth, leaves per plant, leaf stem ratio, total soluble solids, protein content and green fodder yield. Analysis of variance revealed a substantial amount of variability among the genotypes for all the characters under study, indicated a wide spectrum of variability among the genotypes. Highest estimates of the phenotypic coefficient of variation and genotypic coefficient of variation were observed for plant height, leaf breadth, leaves per plant, leaf stem ratio and green fodder yield. High heritability coupled with high genetic advance was observed for plant height, leaf area, stem girth, leaves per plant, leaf stem ratio and green fodder yield. Based on D 2 -Statistics, 30 genotypes were grouped into six clusters. The highest inter-cluster distance was observed between cluster III and VI followed by IV and VI, indicating genotypes included in these clusters had wide genetic diversity. Genetic divergence and cluster mean indicates maximum heterosis and good recombinants may be achieved in crosses between genotypes of clusters III, IV and VI in varietal improvement programme. Thus, crossing between genetically diverse genotypes of cluster III with genotypes CSV 15, PC 1001, SPV 462, PC 3, SSV 84, PC 8 and cluster VI with genotype HJ 513 are expected to exhibit high heterosis and good recombinants with desired traits.

Genetic Divergence Studies for Morphological Traits in Sorghum [Sorghum bicolor (L.) Moench] over the Environments

“…While remaining clusters were solitary. Similar results were observed by Sarwate [7], Barhate [8], Shridher et al [9], Patankar et al [10], Ganesamurthy [11], Damor et al, [12], Ahalawat et al [13] and Karadi et al [14] who has reported 14, 13, 23, 10 and 14 clusters respectively.…”

“…This type of hybridization would be useful for obtaining highest number of valuable segregates along with maximized vigour. Similar instances for intra and inter cluster distances were recorded by Kadam et al [15], Shridher et al [9], Patankar et al [10], Ganesamurthy [11], Shinde et al, [17], Damor et al, [11], Ahalawat et al [13] and More et al [16]. The cluster mean values estimated over genotypes for eleven growth characters in sorghum (Table 4).…”

“…These clusters were also showed maximum mean value for penducle length and penducle width. It reveals that genotypes included in these clusters are useful in inducing earliness in sorghum varieties [15], Patankar et al, [10], Ahalawat et al [13], More et al [16] and Karadi et al [11]. Maximum plant height and number of leaves were observed in genotypes of cluster 2 followed by cluster 5, 1 and 3.…”

Genetic Spectrum of Variation and Diversity for Yield and Yield Attributing Traits in Mutagenized Population of Sorghum (Sorghum bicolor L. Moench)

“…The crossing between cluster-XI and cluster-XIII breeds the most transgressive segregants when selected for hybridisation programme. The results are in equivalent with Prasad and Biradar [17] and Ahalawat et al [18].…”

Study of Genetic Diversity in Forage Sorghum [Sorghum bicolor (L.) Moench]

“…Fourteen varieties grouped under Cluster II indicating their proximity and narrow genetic base. This view point has been supported by the work of More et al [5] and Ahalawat et al [6]. The intra cluster distance among various clusters recorded maximum intra cluster distance (Table-1) for cluster IV (163.164) and lowest intra cluster distance was noted for cluster V (54.781).…”