Summary
Cytoplasmic-genic male-sterility systems are used to economically produce hybrid onion seed. Previous studies have indicated that the source of cytoplasmic male sterility discovered in 1925 by Jones (S-cytoplasm) may be an alien cytoplasm. Restriction enzyme analysis of the chloroplast DNA (cpDNA) revealed five polymorphisms between S and normal (N) fertile cytoplasms. S-cytoplasm was different from the Allium species closely related to the bulb onion, and cladistic estimates of phylogenies supported introduction from an unknown species. S-cytoplasm was identical for all polymorphisms in the cpDNA to ‘Pran’, a triploid viviparous onion. ‘Pran’ shares morphological characteristics with ‘Italian Red 13–53’, the single plant source of S-cytoplasm. Densiometric scans of autoradiograms revealed that 12 of 31 open-pollinated populations of onion possessed S-cytoplasm and that introgression may have occurred since the discovery of S-cytoplasm.
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Havey, M.J. A putative donor of S-cytoplasm and its distribution among open-pollinated populations of onion. Theoret. Appl. Genetics 86, 128–134 (1993). https://doi.org/10.1007/BF00223817
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DOI: https://doi.org/10.1007/BF00223817