pv. phaseolicola can be separated into two genetic lineages distinguished by the possession of the phaseolotoxin biosynthetic cluster Free

Abstract

The bean ( spp.) plant pathogen pv. phaseolicola is characterized by the ability to produce phaseolotoxin (Tox). We recently reported that the majority of the Spanish pv. phaseolicola population is unable to synthesize this toxin (Tox). These Tox isolates appear to lack the entire DNA region for the biosynthesis of phaseolotoxin (- gene cluster), as shown by PCR amplification and DNA hybridization using DNA sequences specific for separated genes of this cluster. Tox and Tox isolates also showed genomic divergence that included differences in ERIC-PCR and arbitrarily primed-PCR profiles. Tox isolates showed distinct patterns of IS genomic insertions and contained a chromosomal IS insertion that was absent from Tox isolates. Using a heteroduplex mobility assay, sequence differences were observed only among the intergenic transcribed spacer of the five rDNA operons of the Tox isolates. The techniques used allowed the unequivocal differentiation of isolates of pv. phaseolicola from the closely related soybean () pathogen, pv. glycinea. Finally, a pathogenicity island that is essential for the pathogenicity of pv. phaseolicola on beans appears to be conserved among Tox, but not among Tox isolates, which also lacked the characteristic large plasmid that carries this pathogenicity island. It is proposed that the results presented here justify the separation of the Tox and Tox pv. phaseolicola isolates into two distinct genetic lineages, designated Pph1 and Pph2, respectively, that show relevant genomic differences that include the pathogenicity gene complement.

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2004-02-01
2024-03-28
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