Variability, character association and genetic diversity in indigenous and exotic lines of wheat (Triticum aestivum L. em. Thell)
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Date
2013-06-06
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ANDUAT, Kumarganj, Ayodhya
Abstract
The present investigation entitled “Variability, character association and genetic
diversity in indigenous and exotic lines of wheat (Triticum aestivum L. em. Thell.) was
undertaken to (i) Estimate the extent of variability in the indigenous and exotic lines of
wheat. (ii) Estimate the correlation coefficient among various characters, (iii)Find out
direct and indirect effects of yield components on grain yield by path coefficient analysis
and (iv) To examine exhisting genetic diversity among collection.
In the present investigation, 210 indigenous and exotic lines of wheat along with 3
checks were evaluated in timely sown and irrigated conditions during Rabi, 2011-12. The
trial was conducted in augmented design having 7 block of 33 plots each, at the main
experiment station of Narendra deva university of agriculture and technology Narendra
Nagar (Kumarganj), Faizabad. The characters studied were Days to 50% flowering, Flag
leaf area (cm), Ear length (cm), Plant height (cm), Tillers/plant, Peduncle length (cm),
Maturity days, 1000-grain weight (g), Biological yield/plant (g), Grain yield/plant (g),
Harvest index (%). The data on 11 characters was utilized for estimation of mean, range
and least significant differences, correlations, path coefficients and genetic divergence
The genotypes IBWSN-1226, IBWSN-1223, IBWSN-1228, SAWYT-311,
DDW22, and IBWSN-1012 produced higher grain yield. This genotype was also posses’
higher mean performance for several other characters. The grain yield/plant showed
positive and highly significant correlation with harvest index, biological yield/plant, days
to maturity, tillers/plant. Path analysis identified biological yield/plant followed by harvest
index emerged as most important direct contributors towards grain yield/plant .The Nonhierarchical
Euclidean cluster analysis grouped 213 exotic and indigenous varieties/lines
into fifteen distinct and non-over lapping clusters.
The highest inter-cluster distance was observed between cluster VII and cluster XI
followed by cluster VII and cluster XII. Thus, crosses between promising lines belonging
to cluster pairs having higher inter-cluster distances may be attempted for isolating
transgressive segregants as these cluster pairs were also separated by high inter-cluster
distances.
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