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Genetic analysis of yield components and molecular characterization in two botanical varieties of Cucumis sativus l. vars. sativus and hardwickii

KrishiKosh

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Title Genetic analysis of yield components and molecular characterization in two botanical varieties of Cucumis sativus l. vars. sativus and hardwickii
 
Creator Choudhary, Harshawardhan
 
Contributor Singh, Dinesh Kumar
 
Subject genetic analysis, yield components, molecular genetics, characterization, Cucumis sativus, cucumis, heterosis, combining ability, genetic diversity
 
Description Thesis-PhD
The present investigation was carried out at Vegetable Research Centre during 2006-2008 and molecular characterization was performed in the molecular marker laboratory, Department of Plant Pathology, G.B. Pant University of Agriculture and Technology, Pantnagar. The major objectives of this study were to know variability parameters, heritability, genetic advance, genotypic and phenotypic correlation in Cucumis sativus var. hardwickii and study of heterosis, combining ability and generation mean analysis in crosses between cucumber genotypes and germplasm lines of Cucumis sativus var. hardwickii along with molecular characterization through RAPD marker. The salient findings are summarized as follows. Analysis of variance revealed highly significant differences among the genotypes for 15 characters which clearly indicated that there was enough variability for these traits among the germplasm lines utilized for the present investigation. Most of the germplasm lines of Cucumis sativus var. hardwickii were late in flowering. These lines had high number of lateral branches per plant (6.44) and number of fruits per plant (18.57) but fruit length (5.03cm) , fruit diameter (3.84cm) and average fruit weight (53.37g) were low. Fruit yield per plant ranged from 316.83g (IC 277048) to 1563.95g (IC 331620) and its mean value was recorded as 707.22g. Highly significant and positive phenotypic correlation was found between fruit yield per plant and number of fruits per plant (0.76), average fruit weight (0.73), pulp breadth (0.73), fruit length (0.71) and fruit diameter (0.68). Only one cross PCUC 15 × P7 showed superiority over better parent (PCUC 15) in negative direction for days to female flower. Seven crosses exhibited significant heterosis over standard parent in positive direction for no of lateral branches per plant. Three crosses showing significant heterobeltiosis for number of fruits per plant were PCUC 8 × P7 (44.22%), PCUC 28 × P5 (18.61%) and PCUC 15 × P7 (18.44%). Four crosses showed superiority over better parent (cucumber genotypes) for fruit yield per plant. The highest value of heterobeltiosis was estimated in cross PCUC 15 × P3 (61.61%) followed by PCUC 15 × P7 (50.90%), PCUC 8 × P7 (43.01%) and PCUC 15 × P5 (28.43%). The cucumber genotype PCUC 28 was identified as best general combiner for earliness, number of fruits per plant, average fruit weight, fruit length and fruit yield per plant. The genotypes P7, P1 and P3 have been identified as good general combined for number of fruits per plant and fruit yield per plant. The cross PCUC 28 × P1 exhibited high sca effects in desired direction for 8 characters of economic importance. The crosses PCUC 8 × P7 showed high sca effects for 6 characters and PCUC 15 × P3 for 4 characters including number of fruits per plant and fruit yield per plant. Generation mean analysis showed that additive components were predominant for days to female flower anthesis, vine length and average fruit weight. Interaction effects were predominant for number of lateral branches, number of fruits per plant, fruit length and fruit yield per plant. The seventeen genotypes were grouped into 5 different clusters on the basis of RAPD analysis showing enough genetic diversity among them.
 
Date 2016-09-21T16:06:42Z
2016-09-21T16:06:42Z
2009-02
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/78159
 
Language en
 
Format application/pdf
 
Publisher G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)