Variability and Genetic Divergence Analysis in Sorghum Genotypes [Sorghum bicolor (L.) Moench]
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Date
2019-06-27
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MPUT, UDAIPUR
Abstract
The Present investigation entitled “Variability and Genetic Divergence Analysis in
Sorghum Genotypes [Sorghum bicolor (L.) Moench]’’ was carried out using 60 sorghum
genotypes during kharif 2018 at Instructional farm, Rajasthan College of Agriculture,
Udaipur. The experiment was laid out in randomized block design with three replications.
The genotypes were evaluated for 14 traits and observations were recorded on 10 randomly
selected competitive plants for each entry except days to 50 per cent flowering and days to
maturity which were recorded on whole plot basis. Analysis of variance revealed significant
difference between genotypes for all the 14 characters. Variability parameters, correlations
coefficients, path coefficients, multivariate analysis of variance and genetic divergence were
studied using these 14 characters.
Sufficient variability was present in the genotypes under study for all the characters.
High heritability along with high genetic gain was for total soluble solids, grain yield per plant
and leaf breadth.
Association study indicated that grain yield per plant exhibited positive and
significant correlation at both genotypic and phenotypic levels with harvest index, dry
fodder yield per plant and green fodder yield per plant, while it’s association was negative
and significant at both genotypic and phenotypic levels with days to maturity and at only
genotypic level with days to 50 per cent flowering. The residual effect at genotypic level
0.7693 and at phenotypic level 0.8196 indicated that 23.07 and 18.04 per cent variability of
grain yield per plant was explained by 11 independent characters at genotypic and
phenotypic levels respectively.
Multivariate analysis of variance using Wilk’s lambda suggest significance difference
between genotypes (P < 0.05) over the 14 characters. The difference between replications
were non-significant (P = 0.08).
Based on equilibrium distance 60 genotypes were grouped into 6 clusters, the
number of genotypes in each cluster ranged from 1 to 17. Among them the cluster V was the
largest with 17 genotypes and cluster II was solitary.
The analysis of variance revealed significant difference between cluster means for
plant height, green fodder yield per plant, dry fodder yield per plant, grain yield per plant,
harvest index and number of leaves per plant only. Genotypes belonging to cluster II and IV
have higher mean values for plant height and number of leaves per plant. Higher mean value
for green fodder yield per plant, grain yield per plant and dry fodder per plant belong to
cluster II, V and VI. High mean value for harvest index belong to cluster III.
Ten genotypes (SU 1426, SU 1429, SU 1528, SU 1548, SU 1582, SU 1583, SU 1584,
SPV 2308, PC 1080 and CSV 23) having productivity of green fodder yield more than 300 q
ha-1 i.e. > 200 g green fodder yield per plant. Out of these, five genotypes viz., SU 1429, SU
1548, SU 1583, SPV 2308 and PC 1080 were having high total soluble solids i.e. more than 15
per cent leaving scope for hybridization to still improve green fodder yield with high total
soluble solids.
Eleven genotypes (SU 1426, SU 1548, SU 1574, SU 1576, SU 1601, SPV 1465, SPV
2185, SPV 2307, SPV 2308, PC 1080, and CSV 23) were identified for dual purpose having
grain yield productivity more than 80 q ha-1 i.e. > 54 g grain yield per plant and
Description
Variability and Genetic Divergence Analysis in Sorghum Genotypes
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Citation
Dalip And Dodiya N.S.