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ADDITIONAL INDEX WORDS. Allium cepa, cytoplasmic male sterility, nuclear male-fertility restoration ABSTRACT. The most commonly used source of cytoplasmic male sterility in onion (Allium cepa) is controlled by the interaction of the cytoplasm (male-sterile (S) or normal male-fertile (N)) and one nuclear male-fertility-restoration locus (Ms). Scoring of genotypes at Ms is generally done by testcrossing male-fertile to male-sterile (S msms) plants, followed by scoring of testcross progenies for male-fertility restoration. We identified two N-cytoplasmic families, one that was homozygous dominant and the other segregating at Ms. Plants from each of these two families were individually testcrossed to male-sterile onion. Nuclear restoration of male fertility in testcross progenies was evaluatedinthefieldover4years.FormaleplantshomozygousdominantatMs,weexpectedtestcrossfamiliestoshow 100% male-fertility restoration, but observed mean values between 46% and 100%. For plants segregating at Ms ,w e again observed lower than expected frequencies of male-fertility restoration. These results demonstrate that the dominant Ms allele shows reduced penetrance, requiring that male-fertility restoration be scored over years to more confidently assign genotypes at Ms.

The Dominant Ms Allele in Onion Shows Reduced Penetrance