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Many genes conditioning male sterility have been reported in the tomato. This study describes the male sterile gene ms-15 and three independently reported alleles (ms-15 26 , ms-15 47 , and Israelims). All alleles at the ms-15 locus differ phenotypically from normal fertile flowers primarily in stamen structure. Stamens of the mutant plants were reduced in size, twisted, seldom connate, and often adnate to the pistil. Further, stamens often bore external ovules and flap-like structures on the adaxial surface. Variation in these abnormalities between the alleles of ms-15 will be discussed.  Fruit “zippering” and catfacing is commonly observed in fruit which results from manual pollination of male sterile flowers. The extent of these abnormalities varies with male sterile genotype and is not observed in the resulting F1 hybrids. It is suggested that these abnormalities result from adnation of the stamens to the ovary.

DESCRIPTION OF FLORAL AND FRUIT MORPHOLOGY OF THE MALE-STERILE15 (MS-15) MUTANT AND ITS ALLELES (MS-1526, MS-1547, AND ISRAELI-MS) IN TOMATO