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Fertility of 17 Colchicine‐induced Perennial Triticeae Amphiploids Through Four Generations 1
Author(s) -
Asay K. H.,
Dewey D. R.
Publication year - 1976
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/cropsci1976.0011183x001600040017x
Subject(s) - triticeae , biology , perennial plant , pollen , hybrid , botany , fertility , elymus , colchicine , chromosome , poaceae , genetics , population , demography , genome , sociology , gene
Seed set and pollen stainability were determined for 17 perennial colchicine‐induced amphiploids (2n=42 or 56) derived from sterile triploid and tetraploid F 1 hybrids of Agropyron, Elymus, Hordeum , and Sitanion species. Chromosome doubling restored fertility; however, the level of fertility in the originally doubled hybrids (C 0 generation) declined in advanced generations. Fertility stabilized in most hexaploids after the C 1 generation, whereas fertility of most octoploids continued to decline. Seed set (seeds/spike) of nine hexaploid amphiploids averaged 17.5, 18.9, and 17.4 in the C 1 , C 2 , and C 3 generations, respectively. Eight octoploid amphiploids averaged 8.1, 9.1, and 4.2 seeds/spike, respectively, over the same three generations. Synthesis of fertile Triticeae grass species appears to be feasible at the hexaploid level but not at the octoploid level.