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Updated: 18-07-12 | ||||
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THE GENETICS OF FLOWERING TIME IN RAPHANUS SATIVUS L. H. GENOTYPE-ENVIRONMENT INTERACTION
Abstract: The genotype-environment interaction for flowering time in Raphanus sativus was studied by 'rowing 10 Early, 2 Check, and 10 Late lines in a Randomized Complete Block Design at two locations luring two times of year. Data on 50 percent flowering time were found to be significantly heterogeneous or the four plantings. However, the data became homogeneous after transformation based on the performance of Check lines in the individual plantings. The effects of the transformation are described and justification for such a transformation is discussed. Breeding lines were grouped, based on heir pedigrees, in four different ways. Analyses of variance of transformed data were done for each type of grouping, separately for the individual plantings as well as combined for all four plantings. The magnitudes of the various variance components were quite different for Early and Late lines. The combined analyses of variance for Early and Late lines nullified some effects that were quite significant in the separate analyses. An attempt has been made to identify the possible causes of significance of the various effects. Estimations of the heritability of mean flowering time of the Check line were possible after certain assumptions on the causes of variability in the selected lines were made. The estimation from the data of three of the plantings were similar as reported by Vahidy and Hartmann (1971). The skewed distribution of the flowering time of the Check lines in the fourth planting was postulated o be the cause of the somewhat higher values of heritability from that planting.
Department of Horticulture, University of Hawaii, Honolulu, Hawaii, U.S.A. [1] Present Address: Department of Genetics, University of Karachi, Karachi-32, Pakistan. |
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