GENETIC VARIABILITY, CORRELATION AND PATH ANALYSIS IN F2 GENERATION OF CHICKPEA (Cicer arietinum L.)
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Date
2006-12
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JAU, JUNAGADH
Abstract
The present investigation was carried out in a set of 10 parents and their 13 F2s of chickpea in a Randomized Complete Block Design with three replications at the Instructional Farm of College of Agriculture, Junagadh Agricultural University, Junagadh during Rabi 2005-06. Observations on thirty and five randomly selected plants in each F2 population and parent, respectively in each replication were recorded for seed yield per plant, days to flowering, days to maturity, productive phase, plant height, plant spread, number of branches per plant, number of pods per plant, number of seeds per plant, biological yield per plant, 100-seed weight and harvest index.
Analysis of variance revealed highly significant differences among the parents and F2s for all the 12 characters under study. A wide range of variation was observed for number of seeds per plant, number of pods per plant and seed yield per plant in parents as well as in F2s. The high genotypic coefficient of variation (in parents) were observed for number of seeds per plant, number of pods per plant, seed yield per plant, number of branches per plant and 100-seed weight. Whereas in F2s, high values of this parameter was noticed in number of pods per plant, number of seeds per plant, seed yield per plant and biological yield per plant. Broad-sense heritability was high for all the characters under investigation in parents. High estimates of heritability were registered by most of the characters in F2s, but 100-seed weight, number of branches per plant and harvest index had moderate estimates.
The high estimates of phenotypic and genotypic coefficient of variation, heritability and genetic advance expressed as percentage of mean were observed for number of seeds per plant, number of pods per plant and seed yield per plant in fix and segregating materials.
In correlation studies, the magnitude of genotypic correlation coefficients was higher as compared to their corresponding phenotypic correlation coefficients in both the material. In case of parents and F2s, the seed yield per plant was significantly and positively associated with number of pods per plant, number of seeds per plant and biological yield per plant at phenotypic level. Genotypic correlation of seed yield per plant with all above said characters was also strong and positive.
Path coefficient analysis carried out in parents revealed that 100-seed weight, biological yield per plant, number of seeds per plant, number of branches per plant and days to maturity made maximum direct contribution towards seed yield per plant. Plant height, number of seeds and pods per plant and harvest index indirectly contributed towards seed yield via number of branches per plant. While, plant spread number of branches per plant, number of pods per plant, number of seeds per plant and harvest index showed substantial indirect effect through biological yield per plant on seed yield per plant. Whereas in case of F2 populations, high to moderate positive direct effects on seed yield per plant were exhibited by number of seeds per plant, number of pods per plant and 100-seed weight. Plant height as well as plant spread contributed through number of pods per plant and seeds per plant, respectively. Biological yield per plant played vital indirect role towards seed yield via number of pods and seeds per plant.
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Botany