EVALUATION OF SORGHUM (Sorghum bicolor (L.) Moench) GERMPLASM LINES FOR CHARCOAL ROT RESISTANCE, YIELD AND YIELD ATTRIBUTING TRAITS
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Date
2013-06-30
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UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR
Abstract
The present investigation was intended to estimate the nature and magnitude of
genetic variability, genetic diversity, character association and charcoal rot resistance in
121 germplasm lines of sorghum including checks. Genetic variability studies revealed
high GCV and PCV for panicle length and grain yield per plant. While plant height and
grain yield per plant showed high genetic advance, whereas panicle length and plant
height showed high genetic advancement of mean and high heritability.
Using Mahalanobis D2 statistics methods, one hundred twenty one germplasm
lines were grouped into thirteen clusters. Cluster-I was largest with 61 genotypes
followed by cluster-XIII with 38 genotypes. Cluster-II to XII each had two genotype.
Inter cluster D2 values ranged between 2.26 (cluster-II and IV) and 9.35 (cluster-X and
XI), indicating wide genetic variability exhibited in the germplasm collection. It is
desirable to select genotypes from clusters having high cluster means and with high grain
yield. Intra cluster distance was highest (8.43) in cluster-XIII and lowest in cluster-II
(1.38) were selected for hybridization programm.
Grain yield had positive and highly significant association with 1000 grain weight
and panicle length, whereas days to 50 per cent flowering and days to maturity had
negative and highly significance correlation with grain yield. Path co-efficient analysis
revealed that 1000 grain weight had the highest positive direct effect on grain yield. Stem
girth had next highest direct effect.
Out of one hundred twenty one genotypes were screened against charcoal rot
disease incidence the three genotypes DSV-4, Athannur-2 and Hebala-4 showed resistant
reaction when compared with resistant check E36-1. With respect to lodging percentage,
mean number of nodes crossed by disease and mean length spread of disease. These
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