Summary
The male sterility system MS-1 of Brassica oleracea was studied in order to elucidate if nucleo-cytoplasmic interactions determine this system. Crosses of male sterile MS-1 genotypes with heterozygous MS-5 genotypes gave fully fertile F1 progenies. Selfing of seven F1 plants resulted in five F2 populations showing a 9:7 segregation ratio and two a 3:1 ratio for fertile and male sterile plants. Two F2 progenies deviated from the expected 9:7 or 3:1 segregation ratios for fertile and male sterile plants. Thermosensitivity and distortion of the meiosis are suggested as the causal factors underlying the deviation of the segregation ratios. It was concluded that nuclear factors determine the male sterility in the MS-1 system, because the presence of a nucleocytoplasmic interaction in this system should have given only a 3:1 segregation ratio for fertile and male sterile plants in the F2 generation.
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Kik, C., Zaal, M.A.C.M. & Verbeek, W.H.J. Analysis of genic male sterility in Brassica oleracea . Euphytica 68, 53–57 (1993). https://doi.org/10.1007/BF00024154
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DOI: https://doi.org/10.1007/BF00024154