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Intraspecific Hybridization in Dallisgrass, Paspalum dilatatum Poir. 1
Author(s) -
Bennett Hugh W.,
Burson Byron L.,
Bashaw E. C.
Publication year - 1969
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1969.0011183x000900060042x
Subject(s) - biology , paspalum , intraspecific competition , interspecific hybridization , botany , hybrid , ecology
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 F 1 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 F 1 and F 2 ; all F 3 , F 4 , and F 5 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 F 2 , F 3 , and F 4 generations, respectively Semidecumbent F 6 lines exceeding 90% seed set indicate the effectiveness of intraspecific hybridization as a breeding procedure for the improvement of apomictic types.