Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 13:637-639 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Polyembryony in Soybeans1

W. J. Kenworthy, C. A. Brim and E. A. Wernsman2

Twin seedlings were observed in the progeny of malesterile (ms1ms1) plants of Glycine max (L.) Merrill from natural crossing blocks. Of the seedlings observed, more than 4% were embryonic twins. Triplets and conjoined individuals were also found. Cytological examinations of root-tip preparations revealed that most individual plants from twin sets were diploid (2n=40). However, diploid: haploid and diploid:triploid twin pairs were also identified. Genetic analysis of a marker trait in the twin seedlings and their selfed progeny indicated that diploid diploid sets originated primarily after cross-fertilization. Evidence suggests that the mechanism underlying the development of these twins involves a cleavage of the zygote or the development and fertilization of multiple embryo sacs within an ovule.

Key Words: Diploid • Triploid • Haploid • Twin seedlings • Glycine max (L.) Merrill

1 Contribution from Southern Region, Agricultural Research Service, USDA and the Department of Crop Science, North Carolina Agricultural Experiment Station, Raleigh, N. C. 27607. Paper No. 3993 of the Journal Series of North Carolina State University. Part of a thesis submitted by the senior author in partial fulfillment of the requirements of the M.S. degree.

2 Research Assistant: Research Agronomist, ARS, USDA, and Professor of Crop Science, North Carolina State University; and Professor of Crop Science, North Carolina State University, respectively.

Received for publication April 9, 1973.


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S.J. Xu, R.J. Singh, K.P. Kollipara, and T. Hymowitz
Hypertriploid in Soybean: Origin, Identification, Cytology, and Breeding Behavior
Crop Sci., January 1, 2000; 40(1): 72 - 77.
[Abstract] [Full Text]


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