STUDIES ON INBREEDING DEPRESSION AND SELF -INCOMPATIBILITY IN INDIAN CAULIFLOWER (Brassica oleracea var. botrytis L.)
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Date
2021
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INDIRA GANDHI KRISHI VISHWAVIDYALAYA RAIPUR (Chhattisgarh)
Abstract
The present investigation entitled “Studies on Inbreeding Depression and Self-Incompatibility in Indian cauliflower (Brassica oleracea var. botrytis L.)” was conducted during the year 2019-20 and 2020-21 at horticultural research cum instructional farm, IGKV, Raipur. The experiment consists of eight parents and sixteen crosses of Indian Cauliflower, which was laid out in randomized block design with three replications. For all of the characters studied, the mean sum of square due to parents and crosses was extremely significant, according to the analysis of variance. Inbreeding depression in the negative direction is desirable for all traits except days to 50% curd maturity. The crosses IGC-9 × Pusa Ashwin, Kartika × Pusa Ashwin and IGC-9 × Sabour Agrim were identified as the best performer with negative inbreeding depression. High level of self-incompatibility was observed in parents Rajasthan Early Kunwari and Kartika.
High magnitude of genotypic and phenotypic coefficients of variation were seen in F1 progeny for traits viz., net curd weight, gross curd weight (g) and marketable curd weight (g) whereas net curd weight in F2 progeny, suggested that substantial improvement in cauliflower through selection for these traits. For all features, the magnitude of PCV was greater than the corresponding GCV. This could be owing to the genotypes interaction with the environment or environmental variables impacting the expression of these traits to some extent. There was a close match between the phenotypic and genotypic coefficients of variation, indicating that the experimental material has enough diversity to improve yield and its component attributes.
High heritability coupled with high genetic advance was observed for net curd weight, gross curd weight, marketable curd weight, harvest index, curd yield, curd diameter, curd size index, days to 50% curd maturity, days to 50% flowering, days to 1st flowering and days to 50% curd initiation indicating the major role of additive gene action in the inheritance of these characters.
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STUDIES ON INBREEDING DEPRESSION AND SELF -INCOMPATIBILITY IN INDIAN CAULIFLOWER (Brassica oleracea var. botrytis L.)