DNA from Azospirillum brasilense Sp7 (ATCC 29145) was hybridized with probes containing the T-region and the vir-region of a nopaline Ti-plasmid, and the chromosomal virulence region (chv) of Agrobacterium tumefaciens. Homology to chv was found. Hybridization signals with the chv probe were detected in 7 A. brasilense strains and 1 A. lipoferum strain tested.
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Waelkens et al. (1987) studied this question.
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