MORPHOLOGICAL AND MOLECULAR CHARACTERIZATION AND HETEROSIS STUDIES IN LOCAL COLLECTIONS OF CUCUMBER (Cucumis spp.)

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dc.contributor.advisorR. C. JAGADEESH
dc.contributor.advisorCHITTAPUR, REKHA.
dc.contributor.advisorGASTI, V. D.
dc.contributor.advisorPATIL, BAPURAYAGOUDA.
dc.contributor.advisorD. S. AMBIKA
dc.contributor.authorSHIVALEELA
dc.date.accessioned2023-10-09T13:31:57Z
dc.date.available2023-10-09T13:31:57Z
dc.date.issued2021
dc.description.abstractThe present investigation was carried out with forty local cucumber collections, which were collected from different regions of Karnataka and evaluated in randomized block design to study the variability, diversity, character association, path analysis, heterosis and molecular diversity at the Department of Biotechnology and Crop Improvement, COH, Bagalkot during 2019-20. Analysis of variance revealed that significant difference observed among ecotypes for all characters except fruit diameter. High PCV, GCV, heritability and high genetic advance over mean were recorded for parameters like vine length at 30 days, number of branches per vine, sex ratio, node number at first female flower appearance, number of fruits per plant, yield per plant, pulp thickness, yield per plant was positively and significantly associated with plant height, number of branches per plant, node at first female flower appears, number of male flowers, number of female flowers, sex ratio, number of fruits per plant, individual fruit weight and fruit length. Path analysis revealed that, highest positive direct effects on total yield per plant was shown by vine length, node at first female flower appears, average fruit weight, number of fruits per plant, individual fruit weight, and fruit length. Genetic divergence analysis using Mahalanobis‟s D2 statistic grouped forty local collections of cucumber into three clusters, of which five local genotypes of cluster II showed maximum intra-cluster distance. The inter cluster average D2 value was maximum between cluster II and III. Per se value of majority of the F1 s were higher than the parents. A high magnitude of heterosis was exhibited over mid parent and better parent. Considering the overall performance in respect of fruit yield per vine, most promising hybrids viz., hybrid-2 (UHSCS-1 x UHSCS-3), hybrid-3 (UHSCS-13 x UHSCS-1) and hybrid-4 (UHSCS-17 x UHSCS-21) exhibited high heterotic effects. The local genotypes UHSCS56, UHSCS-79 was found superior for both growth and yield parameters. These hybrids can be used for further evaluation. SSR markers are co-dominant and highly reproducible which can be used in molecular characterization comparison with other molecular markers. Molecular characterization of forty local collections of cucumber was carried out by using 19 SSR markers. Dendrogram revealed three major clusters. For confirmation of hybridity through SSR markers to analyze the purity of hybrids.
dc.identifier.otherUHS18PGM1053
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810198591
dc.keywordsHorticulture
dc.keywordsBiotechnology
dc.keywordsCrop Improvement
dc.keywordsCucumber
dc.keywordsBlock Design
dc.keywordsHeterosis
dc.keywordsMolecular
dc.keywordsHeritability
dc.keywordsGenetic
dc.keywordsMahalanobis
dc.keywordsClusters
dc.keywordsGenotypes
dc.keywordsMagnitude
dc.keywordsHybrids
dc.keywordsMarkers
dc.keywordsDendrogram
dc.keywordsParameters
dc.keywordsUHS18PGM1053
dc.keywordsT639
dc.language.isoEnglish
dc.pages170 p. (Due to pdf. conversion there is a difference in pages of soft copy and hard copy).
dc.publisherUniversity of Horticultural Sciences, Bagalkot. (College of Horticulture, Bagalkot).
dc.subBiotechnology
dc.themeMORPHOLOGICAL AND MOLECULAR CHARACTERIZATION AND HETEROSIS STUDIES IN LOCAL COLLECTIONS OF CUCUMBER (Cucumis spp.)
dc.these.typeM.Sc
dc.titleMORPHOLOGICAL AND MOLECULAR CHARACTERIZATION AND HETEROSIS STUDIES IN LOCAL COLLECTIONS OF CUCUMBER (Cucumis spp.)
dc.typeThesis
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