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The Journal of Heredity 1994:85(4):279-285
© 1994 The American Genetic Association 85:279-285

research-article

Cytological Expression in the Male-Sterile ms Mutant in Watermelon

X. P. Zhang, H. T. Skorupaka, and B. B. Rhodes

Department of Horticulture, 109 PAAS Building, Clemson University Clemson, SC 29634
The Department ol Agronomy and Soils and Department of Biological Sciences, Clemson University Clemson, SC 29634

Abstract

We described a spontaneous male-sterile mutant inherited as a single recessive nuclear gene (ms) in watermelon. The male sterility was expressed in androecium development, disrupting male-flower function. Female fertility of the male-sterile phenotype was normal. Comparative histological analysis between sterile (msms) and fertile (MsMs, Msms) genotypes showed that the lack of tapetum and the abnormal deposition of fluorescing proteins precluded meiocyte development after telophase II and caused degeneration of meiocytes in sterile anthers. The ms mutation altered the pattern of differentiation of anther wall and resulted in the persistence of five to seven cell layers of locule wall throughout meiosis. The consistent inhibition of ontogeny of meiocytes at telophase II, the absence of pollen production under the varying environmental conditions, and the normal female fertility of the male-sterile genotype permit exploltation of this mutation in hybrid seed production.


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