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Journal of Bacteriology, March 2001, p. 2141-2144, Vol. 183, No. 6
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.6.2141-2144.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Symbiotic Plasmid Rearrangement in Rhizobium leguminosarum bv. viciae VF39SM

Xue-Xian Zhang,dagger Bob Kosier, and Ursula B. Priefer*

Ökologie des Bodens, Institut für Botanik, RWTH Aachen, 52060 Aachen, Germany

Received 17 August 2000/Accepted 14 December 2000

A rearrangement between the symbiotic plasmid (pRleVF39d) and a nonsymbiotic plasmid (pRleVF39b) in Rhizobium leguminosarum bv. viciae VF39 was observed. The rearranged derivative showed the same plasmid profile as its parent strain, but hybridization to nod, fix, and nif genes indicated that most of the symbiotic genes were now present on a plasmid corresponding in size to pRleVF39b instead of pRleVF39d. On the other hand, some DNA fragments originating from pRleVF39b now hybridized to the plasmid band at the position of pRleVF39d. These results suggest that a reciprocal but unequal DNA exchange between the two plasmids had occurred.

* Corresponding author. Mailing address: Ökologie des Bodens, Institut für Botanik, RWTH, Aachen, Worringer Weg 1, 52060 Aachen, Germany. Phone: 49-241-80-6644. Fax: 49-241-8888-637. E-mail: priefer{at}bio1.rwth-aachen.de.

dagger Present address: Center for Ecology and Hydrology, Oxford OX1 3SR, United Kingdom.

Journal of Bacteriology, March 2001, p. 2141-2144, Vol. 183, No. 6
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.6.2141-2144.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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