PJB-1971-1
The genetics of flowering time in raphanus sativus l. i. bidirectional selection
Ahsan A.
vahidy and Richard W. hartmann
Abstract
The genetics of flowering time in raphanus
sativus was studied through biodirectional selections. Indivisual plant selection , from the original open pollinated parent, was practiced for six generations for late flowering, and for four generations for early flowering . realized heritabilities of mean flowering time were computed
using the forula of genetic advance Gs= k x St. dev. x h2. The average realized heritability in the first four generations of selection was 37.42 %. The assumptions on which these estimations were based and
the limitations of the results are descriped and discussed. The estimation od realized heritability in more advanced generations was somewhat lower, about 33 %. From the results of selection in the opposite direction it was concluded that an appreciable amount of genetic variability
was present even after four gemerations of selections. Since planting time had a great effect on the mean flowering day, transformation of data is necessary to
make comparisons between plantings at different times. The assumptions for such a transformation are discussed.
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