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Author: TAMBITKAR, NARESH BHIVA ×

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    ThesisItemOpen Access
    GENETIC DIVERSITY STUDIES IN COWPEA (Vigna unguiculata (L.) Walp)
    (Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli., 2020-09) TAMBITKAR, NARESH BHIVA; PETHE, U.B.; Desai, S. S.; Kadam, J. J.; Dhopavkar, R. V.
    The present experiment entitled “Genetic diversity studies in cowpea (Vigna unguiculata (L.) Walp)”was undertaken to assess the genetic variability, genetic divergence and path analysis in forty-one genotypes of cowpea in randomized block design with two replications at educational and research farm, Department of Agril. Botany, College of Agriculture, Dapoli, Dist. Ratnagiri, Maharashtra during rabi 2019-2020. The estimates of phenotypic, genotypic and environmental variance revealed that phenotypic variance were higher in magnitude than genotypic variance for all the characters. The magnitude of phenotypic and genotypic variance was closer to each other for majority of the characters thus indicating lesser role of environment in the expression of these characters. In general, phenotypic coefficient of variation (PCV) was higher in magnitude over genotypic coefficient of variation (GCV) for all the characters. Different characters showed varying per cent of coefficient of variation both genotypic and phenotypic levels. High genotypic and phenotypic coefficient of variation was observed for the characters iron content (ppm) , plant height at maturity (cm), seed yield per plant (%), days to maturity, dry matter yield per plant (g), while this were low for the characters days to fifty percent flowering. In present investigation, the genotypic correlation coefficient was higher in magnitude than their phenotypic counter parts for most of characters. Dry matter yield per plant and harvest index exhibited highly significant positive correlation with seed yield per plant both phenotypic and genotypic levels. The characters number of primary branches per plant, hundred seed weight, number of pods per plant, iron content, days to 50 % flowering, number of seeds per pod and protein content had non-significant positive correlation with seed yield per plant at both phenotypic and genotypic levels. Forty-one genotypes were grouped into 6 different clusters on the basis of magnitude of D2 values evaluated by Mahanlanobis D2 analysis. Among forty one genotypes, cluster I was comprising 12 genotypes followed by cluster II with 14 genotypes, cluster III with 5 genotypes, cluster IV with 4 genotypes, cluster V with 5 genotypes and cluster VI with 1 genotype. Inter cluster distance i.e. the maximum intra cluster distance was observed in cluster V (37.17) while the maximum inter cluster distance (117.49) was observed in cluster IV and clusters V. The seed yield is complex character and each character had its own effect for establishing correlation with yield. The path coefficient revealed that the character days to 50% flowering, number of pods per plant, plant height at maturity, dry matter yield per plant and harvest index had positive direct effect on seed yield at both phenotypic and genotypic levels, while days to initiation of flowering, days to maturity, number of primary branches per plant, pod length, hundred seed weight had negative direct effect on seed yield per plant at genotypic and phenotypic levels. It is concluded that IC-614758 followed by AKP-1264 and PGCP-27 are observed as best performance in the genotypes studied. These had highest seed yield per plant and also maximum yield attributing characters. The genotype CPD-31 had maximum seed weight; CP-13 had maximum number of seed per pod, while CP-25 had the maximum number of pods per plant. The genotype Phule vithai had highest protein content, CPD-219 had highest iron content and CPD-220 had minimum plant height. The genotype Konkan sadabahar had early maturating. These genotypes can be used as promising genetic material in future breeding program. There was significant diversity reported in present study among all the genotypes.
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    ThesisItemOpen Access
    GENETIC DIVERSITY STUDIES IN COWPEA (Vignaunguiculata(L.)Walp)
    (Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli, 2020-09-30) TAMBITKAR, NARESH BHIVA; Pethe, U. B.
    The present experiment entitled “Genetic diversity studies in cowpea (Vignaunguiculata (L.) Walp)”was undertaken to assess the genetic variability, genetic divergence and path analysis in forty-one genotypes of cowpea in randomized block design with two replications at educational and research farm, Department of Agril. Botany, College of Agriculture, Dapoli, Dist. Ratnagiri, Maharashtra during rabi 2019-2020. The estimates of phenotypic, genotypic and environmental variance revealed that phenotypic variance were higher in magnitude than genotypic variance for all the characters. The magnitude of phenotypic and genotypic variance was closer to each other for majority of the characters thus indicating lesser role of environment in the expression of these characters. In general, phenotypic coefficient of variation (PCV) was higher in magnitude over genotypic coefficient of variation (GCV) for all the characters. Different characters showed varying per cent of coefficient of variation both genotypic and phenotypic levels. High genotypic and phenotypic coefficient of variation was observed for the characters iron content (ppm) , plant height at maturity (cm), seed yield per plant (%), days to maturity, dry matter yield per plant (g), while this were low for the characters days to fifty percent flowering. In present investigation, the genotypic correlation coefficient was higher in magnitude than their phenotypic counter parts for most of characters. Dry matter yield per plant and harvest index exhibited highly significant positive correlation with seed yield per plant both phenotypic and genotypic levels. The characters number of primary branches per plant, hundred seed weight, number of pods per plant, iron content, days to 50 % flowering, number of seeds per pod and protein content had non-significant positive correlation with seed yield per plant at both phenotypic and genotypic levels. Forty-one genotypes were grouped into 6 different clusters on the basis of magnitude of D2 values evaluated by Mahanlanobis D2 analysis.Among forty one genotypes, cluster I was comprising 12 genotypes followed by cluster II with 14 genotypes, cluster III with 5 genotypes, cluster IV with 4 genotypes, cluster V with 5 genotypes and cluster VI with 1 genotype. Inter cluster distance i.e. the maximum intra cluster distance was observed in cluster V (37.17) while the maximum inter cluster distance (117.49) was observed in cluster IV andclusters V. The seed yield is complex character and each character had its own effect for establishing correlation with yield. The path coefficient revealed that the character days to 50% flowering, number of pods per plant, plant height at maturity, dry matter yield per plant and harvest index had positive direct effect on seed yield at both phenotypic and genotypic levels, while days to initiation of flowering, days to maturity, number of primary branches per plant, pod length, hundred seed weight had negative direct effect on seed yield per plant at genotypic and phenotypic levels. It is concluded that IC-614758 followed by AKP-1264 and PGCP-27 are observed as best performance in the genotypes studied. These had highest seed yield per plant and also maximum yield attributing characters. The genotype CPD-31 had maximum seed weight; CP-13 had maximum number of seed per pod, while CP-25 had the maximum number of pods per plant. The genotype Phulevithai had highest protein content, CPD-219 had highest iron content and CPD-220 had minimum plant height. The genotype Konkansadabahar had early maturating. These genotypes can be used as promising genetic material in future breeding program. There was significant diversity reported in present study among all the genotypes.
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    ThesisItemOpen Access
    “GENETIC DIVERSITY STUDIES IN COWPEA (Vignaunguiculata(L.)Walp)” (Accession No. T06851)
    (dr. B.S.KKV., Dapoli, 2020-09) TAMBITKAR, NARESH BHIVA; PETHE, U.B.
    The present experiment entitled “Genetic diversity studies in cowpea (Vignaunguiculata (L.) Walp)”was undertaken to assess the genetic variability, genetic divergence and path analysis in forty-one genotypes of cowpea in randomized block design with two replications at educational and research farm, Department of Agril. Botany, College of Agriculture, Dapoli, Dist. Ratnagiri, Maharashtra during rabi 2019-2020. The estimates of phenotypic, genotypic and environmental variance revealed that phenotypic variance were higher in magnitude than genotypic variance for all the characters. The magnitude of phenotypic and genotypic variance was closer to each other for majority of the characters thus indicating lesser role of environment in the expression of these characters. In general, phenotypic coefficient of variation (PCV) was higher in magnitude over genotypic coefficient of variation (GCV) for all the characters. Different characters showed varying per cent of coefficient of variation both genotypic and phenotypic levels. High genotypic and phenotypic coefficient of variation was observed for the characters iron content (ppm) , plant height at maturity (cm), seed yield per plant (%), days to maturity, dry matter yield per plant (g), while this were low for the characters days to fifty percent flowering. In present investigation, the genotypic correlation coefficient was higher in magnitude than their phenotypic counter parts for most of characters. Dry matter yield per plant and harvest index exhibited highly significant positive correlation with seed yield per plant both phenotypic and genotypic levels. The characters number of primary branches per plant, hundred seed weight, number of pods per plant, iron content, days to 50 % flowering, number of seeds per pod and protein content had non-significant positive correlation with seed yield per plant at both phenotypic and genotypic levels. Forty-one genotypes were grouped into 6 different clusters on the basis of magnitude of D2 values evaluated by Mahanlanobis D2 analysis. Among forty one genotypes, cluster I was comprising 12 genotypes followed by cluster II with 14 genotypes, cluster III with 5 genotypes, cluster IV with 4 genotypes, cluster V with 5 genotypes and cluster VI with 1 genotype. Inter cluster distance i.e. the maximum intra cluster distance was observed in cluster V (37.17) while the maximum inter cluster distance (117.49) was observed in cluster IV andclusters V. The seed yield is complex character and each character had its own effect for establishing correlation with yield. The path coefficient revealed that the character days to 50% flowering, number of pods per plant, plant height at maturity, dry matter yield per plant and harvest index had positive direct effect on seed yield at both phenotypic and genotypic levels, while days to initiation of flowering, days to maturity, number of primary branches per plant, pod length, hundred seed weight had negative direct effect on seed yield per plant at genotypic and phenotypic levels. It is concluded that IC-614758 followed by AKP-1264 and PGCP-27 are observed as best performance in the genotypes studied. These had highest seed yield per plant and also maximum yield attributing characters. The genotype CPD-31 had maximum seed weight; CP-13 had maximum number of seed per pod, while CP-25 had the maximum number of pods per plant. The genotype Phule vithai had highest protein content, CPD-219 had highest iron content and CPD-220 had minimum plant height. The genotype Konkan sadabahar had early maturating. These genotypes can be used as promising genetic material in future breeding program. There was significant diversity reported in present study among all the genotypes.