Intraspecific Hybridization in Dallisgrass, Paspalum dilatatum Poir.1
- Hugh W. Bennett,
- Byron L. Burson and
- E. C. Bashaw2
Rare intraspecific Paspalum dilatatum Poir, hybrids (2n=45) were produced by using a yellow-anthered sexual biotype (2n=40) as the female and a common apomictic biotype (2n=50) as the male. All F1 hybrids were sexual In meiosis, the chromosomes formed 20 bivalents and 5 univalents, which indicates that the biotypes are closely related. The yellow-anthered biotype may be one of the common biotypes' ancestors. Because the univalents were lost during meiosis in the F1 and F2; all F3, F4, and F5 plants had 40 chromosomes which formed 20 bivalents during meiosis. All progeny were sexual.
Semidecumbent habit of growth served as the basis for a selection program regardless of additional selection for any other plant characteristic. Selection for improved seed fertility was practiced among semi-decumbent segregates. Seed set increased progressively from 40, 70, to 80% for the F2, F3, and F4 generations, respectively
Semidecumbent F6 lines exceeding 90% seed set indicate the effectiveness of intraspecific hybridization as a breeding procedure for the improvement of apomictic types.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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