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ARS Home » Research » Publications at this Location » Publication #92883
Title: IDENTIFICATION OF BRADYRHIZOBIA IN SOYBEAN INOCULANTS BY RAPD ANALYSIS

Author
item MARILU, SATO
item GARCIA-BLASQUEZ, CLAUDIO
item Van Berkum, Peter

Submitted to: Revista Latino Americana de Microbiologa
Publication Type: Abstract Only
Publication Acceptance Date: 6/15/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The standards for meeting inoculant quality in Brazil include a requirement of strain verification as well as the necessity for a minimal number of viable bacterial cells. This new requirement stimulated us to develop a rapid and simple PCR-based method to distinguish the four Brazilian strains of Bradyrhizobium, SEMIA 587, SEMIA 5019 (29W), SEMIA 5079 (CPAC-15) and SEMIA 5080 (CPAC-7), recommended for the inoculation of soybean. PCR reactions using the RAPD PCR primer CRL-7 together with a modified buffer resulted in four different fingerprint patterns, which permitted the Brazilian soybean strains to be distinguished from each other. The fingerprint patterns obtained were reproducibile irrespective of the source of templates. Comparisons with fingerprint patterns obtained with soybean bradyrhizobia from the USDA Culture Collection led to the conclusion that two of the Brazilian inoculant strains (SEMIA 587 and SEMIA 5019) were characteristic for B. elkanii, while the other two (SEMIA 5079 and SEMIA 5080) were more typical of B. japonicum. Also, we obtained evidence that the RAPD analysis with primer CRL-7 may be useful for distinguishing variants of the same strain.