1887

Abstract

Members of the genus 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 , can be differentiated into at least three biovars, corresponding to species divisions based on differential biochemical and physiological tests. Recently, Young . [ (2003), 89–103] proposed to incorporate all members of the genus into the genus . 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 to warrant retention of the genus . The biovar 2 agrobacteria cluster more closely to the genus , but some studies suggest that these isolates differ from species of 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 and consequently recommend retention of the genus .

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2003-09-01
2019-09-15
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