A noncompensating wheat-rye translocation maintained in perpetual monosomy in alloplasmic wheat

The 42-chromosome alloplasmic wheat (Triticum aestivum L., 2n = 42) plants with rye (Secale cereale 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...

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Bibliographic Details
Published in:The Journal of heredity 1993-03, Vol.84 (2), p.126-129
Main Authors: Friebe, B, Gill, B.S, Mukai, Y, Maan, S.S
Format: Article
Language:English
Subjects:
Biological and medical sciences
Classical genetics, quantitative genetics, hybrids
Fundamental and applied biological sciences. Psychology
Genetics
Genetics of eukaryotes. Biological and molecular evolution
Grain
HIBRIDACION
HYBRIDATION
INTROGRESION
INTROGRESSION
NOMBRE CHROMOSOMIQUE
NUMERO DE CROMOSOMAS
Plant reproduction
Pteridophyta, spermatophyta
SECALE CEREALE
TRANSLOCACION DE CROMOSOMAS
TRANSLOCATION CHROMOSOMIQUE
TRITICUM AESTIVUM
Vegetals
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Summary:The 42-chromosome alloplasmic wheat (Triticum aestivum L., 2n = 42) plants with rye (Secale cereale 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 (scs) gene located on 1RL conditions seed development, plant vigor, and fertility in alloplasmic wheat, and that plants without the scs gene produce shriveled and inviable seed
ISSN:0022-1503
1465-7333
1471-8505
DOI:10.1093/oxfordjournals.jhered.a111293