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Restriction Fragment Length Polymorphism in Soybean Germplasm of the Southern USA

Clemson Univ. Dep. of Agronomy and Soils and Dept. Biological Sciences, Clemson, SC 29634
USDA-ARS-FCR, Dep. of Agronomy and Zoology/Genetics, Iowa State Univ., Ames, IA 50011
Dep. of Agronomy, and Soils, Clemson Univ., Clemson, SC 29634
Dep. of Agronomy and Soils, Clemson Univ., Clemson, SC 29634
Dep. of Experimental Statistics, Clemson Univ., Clemson, SC 29634

^* Corresponding author.

A soybean restriction fragment length polymorphism (RFLP) map (ISU/USDA-ARS-FCR, Ames, IA) was derived from an interspecific cross of Glycine max (L.) Merr. x G. soja Siebold & Zucc. using early maturity group genotypes. We characterized the feasibility of the application of this map to physiologically distant soybean genotypes mainly maturity group (MG) V to IX. A total of 108 genotypes of G. max were surveyed. Germplasm represented ancestral genotypes, breeding lines and elite cultivars. The RFLP markers (83 probes) used in this research spanned fifteen major linkage groups at an average distance of 26 centimorgans (cM). Fifty-four percent of the probes were non informative. Thirty-five percent had a probability of detecting polymorphism between any two random genotypes with a frequency above 0.3. The RFLP probes detecting polymorphism with high frequency were identified. Restriction fragment length polymorphism was associated with cultivar pedigree and relation to ancestral genotypes. The majority of genotypes showed molecular similarities to ‘Ralsoy’, ‘Dorman’, ‘Dunfield’, and ‘Ogden’ germplasms; a smaller group of genotypes showed molecular similarities to S-100. Genotypic similarities were observed among most genotypes. However, genotypes of MG VI and VII retained potentially valuable levels of genetic diversity. Soybean cyst nematode and bacterial pustule resistance were present in many different genetic backgrounds and no association with donor genotypes was observed in principal components analysis. The set of identified RFLP probes with high frequency of polymorphism detection should serve as a core of molecular markers for initiating mapping of agronomic traits and detection of gene linkages across a wide range of maturity groups of cultivated soybean. Genomic diversity described by the principal components analysis may be useful in germplasm selection to develop populations for genome mapping in soybean.

Received for publication December 28, 1992.

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