CHARACTER ASSOCIATION AND SELECTION INDICES IN FOXTAIL MILLET [Setaria italica (L.) Beauv.]

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dc.contributor.advisorRATNA BABU, D
dc.contributor.authorPAVANI, ALLU
dc.date.accessioned2020-03-03T07:00:53Z
dc.date.available2020-03-03T07:00:53Z
dc.date.issued2019
dc.descriptionD5940en_US
dc.description.abstractThe present investigation was carried out with the prime objective of knowing the character association between different yield and component traits and construction of the best possible selection index for selection of superior genotypes in foxtail millet. To achieve the above objectives, an experiment was conducted at RARS, Lam, Guntur with sixty foxtail millet genotypes during kharif, 2018. The analysis of variance indicated significant differences among 60 genotypes for majority of traits viz., days to 50% flowering, panicle length, productive tillers per plant, days to maturity, iron, zinc, copper, manganese, phosphorus and grain yield per plant indicating a high degree of variability in the material. Phenotypic and genotypic coefficient of variation also indicated the presence of considerable amount of variability for majority of the characters studied. The estimates of heritability and genetic advance as per cent of mean were high for the characters viz., days to 50% flowering, plant height, panicle length, test weight, protein, carbohydrate, calcium, iron, zinc, copper, manganese, phosphorus and grain yield per plant indicating the probable operation of additive gene action in inheritance of these traits and simple selection is sufficient to improve these traits. High heritability coupled with moderate genetic advance as per cent of mean was observed for days to maturity. While moderate heritability coupled with high genetic advance as per cent of mean was observed for productive tillers per plant. Genotypic correlations in general were higher than phenotypic correlations indicating that the apparent associations are largely due to genetic reasons. The traits, test weight, productive tillers per plant, panicle length, carbohydrate and plant height were found to possess significant positive association with grain yield per plant at both genotypic and phenotypic levels. Further, path analysis revealed that test weight, xii productive tillers per plant, panicle length, carbohydrate and plant height showed true relationship with grain yield per plant by establishing significant positive association and positive direct effect at both genotypic and phenotypic levels. Considering the nature and magnitude of character associations and their direct and indirect effects, it can be inferred that test weight, productive tillers per plant, panicle length, carbohydrate and plant height could serve as important traits in any selection programme for selecting high yielding genotypes in foxtail millet. Simultaneous selection taking all characters into consideration was carried out for all the sixty genotypes of foxtail millet and found that Ise 238, Ise 1511, Ise 49 and Ise 132 recorded relatively higher selection index values in the both cases i.e., when the equal economic weights were assigned as well as when inverse of means are used as economic weights for estimation of selection index scores. These results indicate that these four genotypes are superior compared to all other genotypes when simultaneous selection for all the characters was carried out. Restricted selection was carried out by restricting the selection for only fourteen out of fifteen characters without effecting any change in the fifteenth character. In all such fifteen possible restriction selections, the trait plant height recorded maximum estimate of genetic advance in 11 out of 15 cases. This phenomenon was observed in both cases i.e., when equal economic weights are used as well as when inverse of means are used as economic weights of the respective characters. In the process of constructing the suitable selection index for selection of superior genotypes in foxtail millet, maximum estimate of genetic advance over grain yield per plant was obtained when all the fifteen characters under study are included in the construction of selection index. And addition of characters one by one in the selection index constructs resulted in increasing trend of genetic advance values. The best construct was same, when both types of economic weights are used. Further the increasing trend of genetic advance with addition of traits was also similar when both types of economic weights are used. It can be concluded that the best possible construct of selection index for selection of superior genotypes in foxtail millet should include all the fifteen characters which were considered for present investigation. Further, in the process of assigning economic weights to different traits for estimation of score or selection index values to different genotypes as well as in estimation of genetic advance values of different characters and even during restricted selection, it was found that the both ways of assigning the weights i.e., by taking equal economic weights as well as by using inverse of means of respective characters as economic weights are equally effective and resulted in similar conclusions.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810144107
dc.keywordsCHARACTER ASSOCIATION AND SELECTION INDICES IN FOXTAIL MILLET [Setaria italica (L.) Beauv.]en_US
dc.language.isoen_USen_US
dc.pages179en_US
dc.publisherAcharya N G Ranga Agricultural University, Gunturen_US
dc.research.problemCHARACTER ASSOCIATION AND SELECTION INDICES IN FOXTAIL MILLET [Setaria italica (L.) Beauv.]en_US
dc.subGenetics and Plant Breedingen_US
dc.subjectnullen_US
dc.themeCHARACTER ASSOCIATION AND SELECTION INDICES IN FOXTAIL MILLET [Setaria italica (L.) Beauv.]en_US
dc.these.typeM.Scen_US
dc.titleCHARACTER ASSOCIATION AND SELECTION INDICES IN FOXTAIL MILLET [Setaria italica (L.) Beauv.]en_US
dc.typeThesisen_US
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