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Please use this identifier to cite or link to this item: http://www.erepo.iihr.ernet.in/handle/123456789/301

Title: Genetical studies in papaya (Carica papaya L.)
Authors: M R, Dinesh
Guide/Chairperson: C P A, Iyer
Keywords: papaya
Genetical
Issue Date: 1990
Year of Submission: 1990
Abstract: A study was undertaken to assess the genetic potential in papaya so that the information thus obtained could form the basis for further breeding work in papaya. For this purpose an experiment was conducted during the years 1984 to 1986, at the fields of the Indian Institute of Horticultural Research, Hessaraghatta. The diallel analysis indicated the importance of additive and non-additive gene action for the sixteen characters studied. The F1 hybrids exhibited heterosis over mid parental values (Heterosis), better parent (Heterobelfiosis) and the best parent or standard parent (standard heterosis). The parents Coorg Honey Dew and Pink Flesh Sweet were observed to be the best combiners for yield. The cv. Pink flesh Sweet was also found to be the best combiner for fruit length, fruit breadth, fruit weight, fruit volume, pulp thickness, TSS, fruit cavity index and reducing sugars. The cvs. Sunrise Solo and Waimanalo were also noticed to be good combiners for pulp thickness and TSS. Heritability (in narrow sense) values were observed to be higher for the characters plant spread, total sugars and carotene. In general genotypic correlation coefficients were higher than the phenotypic correlation coefficients between pairs of characters, indicating that strong intrinsic correlations are reduced at the phenotypic level due to environmental effects. Correlation studies indicated that yield was significantly associated in positive direction at the phenotypic level with number of fruits, fruit weight and reducing sugars, association in negative direction was significant with fruit cavity index, plant height and plant spread. The yield components number of fruits and fruit weight are significantly correlated with fruit cavity index in the positive direction. At the genotypic level, yield was correlated significantly in the desirable direction with number of fruits, fruit length, fruit breadth, fruit weight, fruit volume and pulp thickness. Association in negative direction was significant with plant height. The co-heritability estimate with regard to yield was positive in all the characters maximum estimate was obtained with fruit volume and minimum with pulp thickness.
URI: http://www.erepo.iihr.ernet.in/handle/123456789/301
University in which they received their degree: University of Agricultural Sciences, Bangalore
Degree Level: Ph.D
Appears in Collections:DIVISION OF FRUIT CROPS

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