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The Journal of Heredity 1993:84(2):97-104
© 1993 The American Genetic Association 84:97-104

research-article

Possible Homeosis in Flower Development in Cultivated Soybean [Glycine max(L.) Merr.]: Morphoanatomy and Genetics

H. T. Skorupska, N. V. Desamero, and R. G. Palmer

Department of Agronomy and Soils and Biological Sciences, Clemson University Clemson, SC 29634
Department of Biological Sciences, Clemson University Clemson, SC 29634
U.S. Department of Agriculture, Agricultural Research Service, Field Crops Research, Iowa State University Ames

Send correspondence and reprint requests to H. Skorupska at the address above.

Abstract

We have identified a spontaneous mutation in soybean [Glycine max (L.) Merr] that alters flower development and produces apetalous male-sterile flowers. The apetalous male-sterile soybean mutation exhibited floral structure abnormalities similar to several homeotic gene mutations in Antirrhinum and Arabidopsis. Stereoscopy, light microscopy, and scanning electron microscopy observations were made on flower buds at different developmental stages. The characteristic features were the lack of standard petal, lateral wings, and keel petals and the appearance of an elongated sepaloid calyx. Gynoecia were characterized by enlarged unfused ovaries and exposed ovules. The number of stamens was reduced, and various levels of stamen malformation were observed. Male sterility was documented, and it was attributed to tapetum malfunction. Genetic studies indicated that a single recessive nuclear gene is responsible for this apetalous male-sterile character in soybean. No linkages were detected with Ln (leaflet shape), Pb (pubescence tip), Enp (endopeptidase), Ap (acid phosphatase), Pgi2 (phosphoglucose isomerase), Idh2 (isocitrate dehydrogenase), or Aco2 (aconitase).


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R.G. Palmer, A.L. Matson, and H.T. Knap
Registration of an Apetalous Male-Sterile Genetic Stock (T368) of Soybean
Crop Sci., November 1, 2004; 44(6): 2282 - 2283.
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