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Genetic diversity of wild and cultivated soybeans growing in China revealed by RAPD analysis


Genetic diversity of wild and cultivated soybeans growing in China revealed by RAPD analysis



Plant breeding = Zeitschrift fur Pflanzenzuchtung 122(6): 503-506



ISSN/ISBN: 0179-9541

DOI: 10.1046/j.0179-9541.2003.00911.x

To evaluate the genetic diversity and to clarify the genetic relationships of wild and cultivated soybeans growing in China, 21 wild soybean accessions and 27 cultivated soybean landraces were analysed by using the random amplified polymorphic DNA method. The data show that wild soybean has a higher genetic variation than cultivated soybean, indicating that genetic variation has been reduced by domestication of wild soybean. Based on Nei's genetic similarity coefficient, all the accessions were classified into two major clusters, corresponding to wild and cultivated varieties of soybean. Furthermore, within each species, the accessions tend to form sub-clusters that are in agreement with their geographical origins, demonstrating that an extensive geographical genetic differentiation exists in both species. For cultivated soybean, the varieties from the same geographical region but with different seasonal types were found to have closer genetic relationships than varieties from different geographical regions but with the same seasonal type. This result indicates that geographical differentiation plays a key role in the genetic differentiation of both wild and cultivated soybeans. Cultivated soybean varieties with different seasonal types in a region might have been established mainly from the local genotypes.

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Accession: 004174057

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