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The Journal of Heredity 1984:75(4):311-312
© 1984 The American Genetic Association 75:311-312

other

Simultaneous genetic mapping of morphological and biochemical traits in the soybean

T. E. Devine, Y. T. Kiang, and M. B. Gorman

Nitrogen Fixation and Soybean Genetics Laboratory, U.S. Department of Agriculture ARS
Plant Physiology Institute, Beltsvilie Agricultural Research Center Beltsville, MD 20705
Department of Plant Science and the Genetics Program, University of New Hampshire Durham, NH 03824

Please address reprint requests to Dr. Devine

Abstract

The soybean, Glycine max (L.) Merr., genome contains 20 chromosome pairs. The probability that any two random loci would occur on the same chromosome is only one in 20. To enhance the probability of detecting linkage and to accelerate the genetic mapping of the soybean chromosome complement, efficient methods are needed to evaluate multiple loci in each cross. We employed an integrated procedure of utilizing efficient and inexpensive electrophoretic isozyme analyses that are not destructive of the seedlings combined with both a seedling assay for a pubescence trait and a nodulation response trait. Fifteen gene combinations, including morphological, symbiotic, and biochemical traits, were successfully tested for linkage in a single cross. The loci tested were P, controlling the presence or absence of pubescence; Rj4 controlling ineffective nodulation specifically with rhizobial strain USDA 61; and the lsozyme markers Mpi, Pgm1, Pgd and Gpd. All possible linkage combinations tested demonstrated independent assortment.


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