CURRENT AGRICULTURE 1 (1), OCTOBER, 2017
Stability parameters for sex expression in castor (Ricinus communis L.) under different environment
Author: M. Ramesh, C. Lavanya, M. A. Sujatha, J. Aruna Kumari
Category: Genetics and plant breeding
Stability parameters on 12 diverse parental genotypes of castor (Ricinus communis L.) including 8 pistillate lines and four male lines were estimated under three environments during kharif 2011. The expressions of genotypes were influenced by the varying environments. Highly significant genotype x environment interaction for all the traits studied indicated differential response of genotypes with fluctuating environmental conditions. Both linear and non-linear components of variation contributed for stability of all the traits studied. Prediction of performance under different environments could be made for sex expression (percent pistillate whorls) at primary raceme, number of pistillate whorls on secondary 1, number of pistillate whorls on secondary 2 and number of pistillate plants in primary spike. For seed yield/plant VP-1, DPC-21 and DCS-78 were found stable. It was concluded that the sex expression in castor is influenced by both genotype and environment, where in a better management improves the proportion of femaleness and stress conditions increases the proportion of maleness. The mean number of pistillate whorls on primary spike varied from 17.1 in JP-88 to 36.3 (DPC-19). In secondary spike 1 and 2 also, the number of pistillate whorls were highest in DPC-19. All the genotypes recorded least or non significant deviations from linear regression.
Keywords: Castor, G x E interaction, sex expression, stability, yield component