Characterization of advance inbred lines of pearl millet [Pennisetum glaucum (L.) R. Br.] for drought tolerance
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Date
2017
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CCSHAU
Abstract
Fifty pearl millet inbred lines were used to study genetic variability and correlation analysis
for Morpho-physiological characters namely leaf rolling, flag leaf area, flag leaf angle, number of
tillers per plant, stem thickness, plant height, grain yield, dry fodder yield, days to 50 % flowering,
panicle length, grain yield per panicle, grain volume, total panicle number per plant, grain mass (1000
grain wt.), grain number per panicle, drought response index (DRI), relative water content, drought
susceptible index (DSI), canopy temperature, osmotic potential and chlorophyll fluorescence were
studied. The pearl millet inbred lines were evaluated in randomized block design with three replications
in two locations (Hisar and Bawal) in kharif 2013. Analysis of variance for all the characters under
study showed significant differences indicating the presence of genetic variability among the inbreds
lines. The genotypes were evaluated for 15 growth traits, yield components, and yield. All the
quantitative traits varied significantly among the test genotypes. A wide range was observed for all
variability parameters in characters studied which demonstrated presence of substantial variation
among the inbred lines. A higher PCV of characters than its corresponding GCV suggested the role of
environment in the expression of all these characters. High to moderate heritability and genetic advance
as per cent of mean for dry fodder yield per plant, grain yield per plant indicated additive gene action
for these characters. Panicle length, stem thickness and 1000 grain weight having moderate heritability
with moderate genetic advance indicated both additive and non-additive gene effects for these traits.
High heritability, low genetic advance and low variability observed for days to 50% flowering
indicated prevalence of non-additive gene action for this trait. The correlation study revealed that
estimated genotypic correlations for most of the characters were greater than their phenotypic ones.
This clearly indicated that number tiller per plant can be used as indirect selection criteria to increase
the seed yield only at hisar location. A set of 50 SSR primers was also used for molecular diversity
assessment in 50 pearl millet inbred lines. Mean allele per locus and PIC obtained was 4.54 and, 0.579
respectively. Cluster analysis distributed these genotypes into 11 clusters where 2 genotypes failed to
fall in any of these clusters.
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