Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810021912
Authors: Mahesh Kumar Meena
Advisor: Dr. M. S. Pithia
Title: SELECTION INDICES AND GENETIC DIVERGENCE IN DESI CHICKPEA (Cicer arietinum L.)
Publisher: jau,junagadh
Language: en
Type: Thesis
Pages: 170
Agrotags: plant breeding
Abstract: ABSTRACT An experiment was conducted to assess correlation coefficient, path coefficients, selection indices and genetic divergence for seed yield and its attributes with a set of 113 genotypes of desi chickpea (Cicer arietinum L.) at Pulses Research Station, Junagadh Agricultural University, Junagadh during Rabi 2009-10. The characters studied were days to 50 per cent flowering, days to maturity, reproductive phase duration, plant height, number of branches per plant, number of pods per plant, biological yield per plant, 100-seed weight, seed yield per plant, harvest index and protein content. The analysis of variance revealed that mean square due to genotypes was highly significant for all traits studied. Yield components viz., biological yield per plant, number of pods per plant, harvest index, 100-seed weight, plant height and number of branches per plant were positively and significantly associated with seed yield per plant at phenotypic level. Days to 50 % flowering as well as days to maturity possessed negative and significant phenotypic correlation with seed yield per plant. Biological yield per plant and harvest index showed high and positive direct effect towards seed yield per plant. Sixty-three selection indices, involving seed yield and five yield components, were constructed using the discriminant function technique. The efficiency of selection increased with the inclusion of more number of characters in the index. The selection index based on five characters viz., seed yield per plant, biological yield per plant, harvest index, 100-seed weight and number of pods per plant exhibited maximum gain and relative efficiency. It is expected that seed yield could be improved if due consideration is given to these traits in future breeding programme of chickpea. The genetic divergence assessed by Mahalanobis D2- statistic, grouped 113 genotypes into fifteen clusters. The clustering pattern of the genotypes was independent of their geographical distribution. The maximum inter-cluster distance (D) was observed between cluster VII and XII. The attributes, viz., seed yield per plant, 100-seed weight and number of pods per plant would be useful for heterosis breeding as they contributed maximum towards the total genetic divergence. On the basis of cluster means, the cluster VII differed from other clusters in respect of seed yield per plant. The cluster VIII had desirable mean values for days to 50% flowering and days to maturity. The cluster XV was found appropriate for reproductive phase duration and plant height. Cluster number XII, IV, IX, III and XI were the best for number of branches per plant, number of pods per plant, biological yield per plant, harvest index, 100-seed weight and protein content, respectively. Therefore, intercrossing between genotypes involved in such clusters would be useful for generation of wide spectrum of genetic variability in respective traits. On the basis of above studies, it can be concluded that due weightage should be given to biological yield per plant, harvest index, number of pods per plant, 100-seed weight and days to 50% flowering while imposing selection for genetic improvement of seed yield in chickpea.
Subject: Plant Breeding
Theme: SELECTION INDICES AND GENETIC DIVERGENCE IN DESI CHICKPEA (Cicer arietinum L.)
These Type: M.Sc
Issue Date: 2011-10
Appears in Collections:Thesis

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