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This article in CS

  1. Vol. 9 No. 6, p. 807-809
     
    Received: May 24, 1969


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doi:10.2135/cropsci1969.0011183X000900060042x

Intraspecific Hybridization in Dallisgrass, Paspalum dilatatum Poir.1

  1. Hugh W. Bennett,
  2. Byron L. Burson and
  3. E. C. Bashaw2

Abstract

Abstract

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.

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