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Heterosis and combining ability studies for yield and yield associated traits in bread wheat (Triticum aestivum L. Em. Thell)

KrishiKosh

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Title Heterosis and combining ability studies for yield and yield associated traits in bread wheat (Triticum aestivum L. Em. Thell)
 
Creator Singh, Navneet Kumar
 
Contributor Rawat, R.S.
 
Subject heterosis, combining ability, yield components, correlation, wheats, Triticum aestivum, path analysis, inheritance, heritability
 
Description Thesis-PhD
The present investigation was undertaken with a view to estimate the general and specific combining ability effects, manifestation of heterosis, extent of coefficient of variation, heritability and genetic advance, character association and path coefficient analysis in respect of inheritance of grain yield and its component characters in a 10x10 half diallel. It comprised of bread wheat (Triticum aestivum L. em. Thell) genotypes viz., DBW 17, UP 2382, HW 2019, UP 2572, UP 2584, JOB 666, UP 2774, HD 2967, PBW 343 and DBW 50. The experimental material was laid in randomized complete block design (RCBD) with 3 replications at N. E. Borlaug Crop Research Centre, G. B. Pant University of Agriculture and Technology, Pantnagar during winter season of 2008-09 and 2009-10. Moderate to high degree of heterobeltiosis and standard heterosis were recorded for grain yield per plant and most of its components. The percent standard heterosis, for grain yield ranged between -13.74 to 44.08%, suggesting good scope for identifying heterotic crosses for exploitation in optimum fertility conditions. Analysis of variance for combining ability revealed that non-additive genetic variance played a predominant role in the inheritance of most of the traits. The genotypes UP 2572, DBW 50 and JOB 666 were considered as the best general combiners, while hybrids UP 2774 x PBW 343, UP 2382 x UP 2774 and UP 2382 x UP 2584 as good specific combinations for grain yield per plant and other associated traits. These hybrid combinations can either be utilized directly for varietal development or as donors for component line development. Grain yield per plant showed highly significant and positive correlation with days to maturity, spike length, number of tillers per plant, grain weight per spike, 1000-grain weight, biological yield and harvest index at both genotypic and phenotypic level. Path coefficient analysis revealed that biological yield and harvest index had the highest significant direct and indirect effect on grain yield per plant.
 
Date 2016-08-16T14:10:08Z
2016-08-16T14:10:08Z
2011-08
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/72590
 
Language en
 
Format application/pdf
 
Publisher G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)