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DIALLEL ANALYSIS IN COWPEA [Vigna unguiculata (L.) Walp]

KrishiKosh

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Title DIALLEL ANALYSIS IN COWPEA [Vigna unguiculata (L.) Walp]
 
Creator PATEL, BHAVESHKUMAR N.
 
Contributor DESAI, R.T.
 
Subject animal husbandry, productivity, soybeans, flavouring, milk products, inorganic acid salts, proteins, beverages, costs, irrigation
 
Description In the present investigation, information on the magnitude of heterosis, combining ability and its interactions with locations, G x E interactions and stability parameters were obtained for seed yield per plant and its related components following half diallel mating design involving twelve varieties/strains of cowpea. The twelve parents and their 66 F1s were tested under four environments created artificially through two different sowing dates each in Late Kharif and Late rabi 2009-10 at College Farm, Navsari Agricultural University, Navsari in a randomized block design with three replications.
Name of Student
Major Advisor
Shri. Patel B. N.
Dr. R.T.Desai
Significant difference existed among the parents and hybrids, indicating considerable genetic variation among these genotypes.
Highly significant positive heterosis over mid and better parent for seed yield and its component characters suggested that there is a good scope of exploiting heterosis commercially and possibility of isolating desirable segregants. The cross CPD-103 x Re-79 manifested highest heterosis over better parent with high seed yield per plant followed by crosses GC-4 x CPD-103, GC-4 x CPD-105 and Rev-7 x Re-79. Heterotic effect for seed yield per plant was found to be associated with heterosis for its related traits in majority of crosses.
Combining ability analysis revealed that both additive and non-additive variances were significant for seed yield per plant and its related traits indicating their involvement in the expression of various traits. The magnitude of non-additive variance was higher for seed yield per plant and its contributing traits indicating predominant role of non-additive gene action in the inheritance of the traits. Among the parents Re-101,GC-4 and CPD-112 were good general combiners for seed yield and most of yield components. The parents viz., CPD-108 and CPD-112 were good general combiners for earliness and short plant stature. The cross GC-4 x CPD-103, GC-4 x CPD-105 and Rev-7 x Re-79 showed sca effects of higher order for seed yield and majority of yield components.
Expression of heterosis for seed yield and its components was related to gca effects of parents. High heterotic crosses for various characters involved at least one parent with high gca effect. A fairly close and positive association between per se performance and combining ability in both parents and hybrids was observed for almost all traits taken under study. The crosses which depicted high sca effects for seed yield and its attributes were in general, combinations of parents with good x good or good x poor gca effects.
Highly significant G x E interaction for majority of the traits was found which indicated differential response of genotype to varied environments. Both linear and non-linear components were found important in building up total G x E interactions. None of the parent and hybrid was found average stable for all the characters studied across environments. Non-additive effects played significant role in the inheritance of seed yield and its components. Therefore, it is suggested that biparental mating system could be followed for accumulation of additive gene effect and breaking undesirable linkage in order to exploit both additive and non-additive gene effects.
 
Date 2016-04-29T09:11:15Z
2016-04-29T09:11:15Z
2012-03
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/65655
 
Language en
 
Format application/pdf
 
Publisher Navsari Agricultural University, Navsari