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- Title
A Noncompensating Wheat-Rye Translocation Maintained in Perpetual Monosomy in Alloplasmic Wheat.
- Authors
Friebe, B.; Gill, B. S.; Mukai, Y.; Maan, S. S.
- Abstract
The 42-chromosome alloplasmic wheat ( L., 2 = 42) plants with rye ( L.) cytoplasm were studied to document cytoplasm-specific nuclear introgression. The C-banding and in situ hybridization analyses of alloplasmic wheat plants revealed a T3AL·1RL chromosome consisting of a complete rye arm 1RL translocated to a complete wheat arm 3AL. The T3AL·1RL is a noncompensating translocation involving exchanges of nonhomoeologous arms 1RL and 3AL. The 42-chromosome plants were monosomic for chromosomes 3A and T3AL·1RL (N/T). The N/T plants produced about 10% shriveled and inviable seeds with presumably N/N embryos (disomic for 3A) and 90% plump seeds. Of the plump and viable seeds, 89% produced N/T and 11% produced disomic T3AL·1RL (T/T) plants. The N/T plants were high tillering, vigorous, and partially fertile. The T/T plants had reduced tillering and poor vigor, and they were self-sterile. Because only N/T plants produced selfed seed, the T3AL·1RL chromosome is maintained in perpetual monosomy. We hypothesize that a species-cytoplasmic-specific () gene located on 1RL conditions seed development, plant vigor, and fertility in alloplasmic wheat, and that plants without the gene produce shriveled and inviable seed.
- Publication
Journal of Heredity, 1993, Vol 84, Issue 2, p126
- ISSN
0022-1503
- Publication type
Article