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ARS Home » Midwest Area » Ames, Iowa » Corn Insects and Crop Genetics Research » Research » Publications at this Location » Publication #132852
Title: EVALUATION OF ALLOZYME DIVERSITY IN THE USDA SOYBEAN GERMPLASM COLLECTIONS FROM CHINA

Author
item CHUNG, M - GYEONGSANG NATIONAL UNIV
item Palmer, Reid

Submitted to: Botanical Society of America Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 5/1/2002
Publication Date: 7/27/2002
Citation: CHUNG, M.G., PALMER, R.G. EVALUATION OF ALLOZYME DIVERSITY IN THE USDA SOYBEAN GERMPLASM COLLECTIONS FROM CHINA. BOTANICAL SOCIETY OF AMERICA ABSTRACTS. 2002. Paper No. 197.

Interpretive Summary:

Technical Abstract: Information on genetic diversity within and among provinces or regions in the center of gene pool of crop species is essential for the efficient utilization of plant genetic resource collections. We evaluated the genetic variation in soybean cultivars within and among provinces from China (4655 accessions from the USDA Soybean Germplasm Collection) and screened 51 alleles on 19 polymorphic loci (eight enzyme systems). We found high levels of allozyme diversity within provinces; mean percentage of polymorphic loci, mean number of alleles per locus, and genetic diversity ranged from 42.1%, 1.52 and 0.167 (prov. Guandong) to 94.8%, 2.53, and 0.298 (pov. Sichuan), respectively. Overall about 81% of the total variation in the total samples is common to all provinces (FST = 0.192). An UPGMA phenogram based on Nei¿s (1978) genetic distance revealed three groups which correspond to the three regions (northern, central, and southern), suggesting that historically human-mediated seed dispersal in China has occurred longitudinally rather than latitudinally. In addition, since three groups of Chinese gene pools were recognized, crosses between each of these groups and crosses between other gene pools could increase genetic variability in the future. Since there were a significant correlation between sample size and genetic diversity (log [N] vs. genetic diversity; r = 0.619, R2 = 0.383, P = 0.002), it may be necessary to obtain more accessions to maintain diverse sources of gene pools in the USDA Soybean Germplasm Collection.