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2020 - 20223
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Subject: Plant Breeding ×

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    ThesisItemOpen Access
    Path coefficient analysis for important yield components in black gram [Vigna mungo (L.) Hepper]
    (Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli, 2022-12) Khanvilkar, Onkar
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    ThesisItemOpen Access
    GENETIC VARIABILITY STUDIES IN F4 PROGENIES OF RICE (OryzasativaL.) (Accession No. T06853)
    (dr. B.S.KKV., Dapoli, 2020-11) UMATE, AVINASH TANAJI; Gawai, M. P.
    The present investigation entitled ―Genetic variability studies in F4 progenies of Rice (Oryza sativa L.)‖ was undertaken during Kharif2019 at Research and Experimental farm of Regional Agricultural Research station Karjat, (Raigad), Maharashtra; with research objectives. 1. To study the nature of genotypic and phenotypic variability in F4 progenies of rice. 2. To study the character association using correlation and path analysis. Observations were recorded on seventeen characters viz. plant height(cm), total number of tillers per plant, panicle length (cm),Straw yield/ plant (gm), harvest index (%), days to 50% flowering, days to maturity, no. of filled spikelet‘s per panicles, no. of filled spikelet‘s per panicle, spikelet fertility (%),1000 grain weight (gm), amylose content (%), gel consistency (mm), grain elongation before cooking, grain elongation after cooking, head rice recovery (%), alkali spreading value, grain yield per plant (g). Mean sum of square due to treatments were highly significant for all the characters under study for variability. Among all the segregating lines line 2015- 14- 9- 9- 6 found to be earliest in days to 50% flowering, days to maturity. 2015- 14- 17- 8- 8 found late in days to 50% flowering, days to maturity, while Pusa Basmati-1 recorded maximum plant height (cm), panicle length (cm) and test weight. 2015- 14- 9- 9- 6 recorded maximum number of tillers per plant. 2015-14-10-15-10 recorded maximum number of filled spikelet per panicle. 2015-14-8-9-3 recorded maximum grain yield per plant. Maximum harvest index was found in 2015-14-3-5-2 segregating line. The environmental variance was lower than genotypic variance but phenotypic variance was more than genotypic variance. Genotypic and phenotypic coefficient of variance was highest in characters number of filled spikelet per panicle, 50% flowering, plant height while lower in test weight followed by yield per plant, number of tillers per plant. High heritability was observed IN days to maturity,days to 50 per cent flowering,testweight, plant height,straw yield per plant, panicle length,spikelet fertility,grain yield per plant (g),number of spikelet per panicle,harvest index, number of tillers per plant and number of filled spikelet per panicle. The quality characters phenotypic and genotypic coefficient of variation was highest for amylose content followed by alkali spreading value, gel consistency and grain elongation after cooking. Association of grain yield with straw yield, harvest index and test weight recordedhighly significant plant height, number of tillers per plant, panicle length, days to 50% flowering, spikelet fertility recorded positive correlation respectively, whereas days to maturity recorded highly negative significant and number of spikelet per panicle recorded negative significant correlation Plant height, number of tillers per plant, panicle length, straw yield, harvest index, number of spikelet per panicle, number of filled spikelet per panicle, test weight recorded direct positive effect on grain yield whereas days to 50% flowering, days to maturity and spikelet fertility recorded direct negative effect on grain yield
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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.