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Agrobacterium is a definable genus of the family Rhizobiaceae

¹ Departments of Crop Sciences and Microbiology, University of Illinois at Urbana-Champaign, 240 ERML, 1201 West Gregory Drive, Urbana, IL 61801, USA
² Soybean Genomics and Improvement Laboratory, Plant Sciences Institute, USDA-ARS, Beltsville, MD, 20705, USA
³ Laboratoire de Sciences de la Terre, Ecole Normale Superieure de Lyon, 69364 Lyon Cedex 07, France

Correspondence
Stephen K. Farrand
stephenf{at}uiuc.edu

Members of the genus Agrobacterium constitute a diverse group of organisms, all of which, when harbouring the appropriate plasmids, are capable of causing neoplastic growths on susceptible host plants. The agrobacteria, which are members of the family Rhizobiaceae, can be differentiated into at least three biovars, corresponding to species divisions based on differential biochemical and physiological tests. Recently, Young et al. [Int J Syst Evol Microbiol 51 (2003), 89–103] proposed to incorporate all members of the genus Agrobacterium into the genus Rhizobium. We present evidence from classical and molecular comparisons that supports the conclusion that the biovar 1 and biovar 3 agrobacteria are sufficiently different from members of the genus Rhizobium to warrant retention of the genus Agrobacterium. The biovar 2 agrobacteria cluster more closely to the genus Rhizobium, but some studies suggest that these isolates differ from species of Rhizobium with respect to their capacity to interact with plants. We conclude that there is little scientific support for the proposal to group the agrobacteria into the genus Rhizobium and consequently recommend retention of the genus Agrobacterium.

Published online ahead of print on 13 December 2002 as DOI 10.1099/ijs.0.02445-0.

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