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Pak. J. Bot., 4 (2): 89-97, 1972.

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THE GENETICS OF FLOWERING TIME IN RAPHANUS SATIVUS L. III. EARLY X LATE CROSSES, F, AND F₂ GENERATIONS
 

Ahsan A. Vahidy[1] and Richard W. Hartmann
 

Abstract: Crossing experiments between early flowering and late flowering lines were conducted in the green­house. For this purpose, 10 Early and 10 Late plants were divided into two sets (each set consisting of 5 Early and 5 Late plants). The crosses were made between Early and Late plants in all the possible combinations (including reciprocals) within each set. No significant differences between the crosses and their reciprocals were found for the time of flowering. The data of both the F, and F₂ plantings were adjusted by comparing with check plants to make the data of these plantings comparable to that of the original parental planting. Frequency distributions of the Fj and F₂ showed no dominance for the time of flowering and indicated that there probably are many genes controlling this character. The heritability for the time of flowering was 34.90 percent as calculated from the variances of Fj and F₂ generations.

Department of Horticulture, University of Hawaii, Honolulu, Hawaii, U.S.A.

Present address: Department of Genetics, University of Karachi, Karachi-32, Pakistan. Journal series No. 1591 of the Hawaii Agricultural Experiment Station.

Present address: Department of Botany, University of Karachi, Karachi-32, Pakistan.