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. 1997 Jan;63(1):282–288. doi: 10.1128/aem.63.1.282-288.1997

Comparative analysis of Pseudomonas syringae pv. actinidiae and pv. phaseolicola based on phaseolotoxin-resistant ornithine carbamoyltransferase gene (argK) and 16S-23S rRNA intergenic spacer sequences.

H Sawada 1, T Takeuchi 1, I Matsuda 1
PMCID: PMC168320  PMID: 8979356

Abstract

Pseudomonas syringae pv. phaseolicola, which causes halo blight on various legumes, and pv. actinidiae, responsible for canker or leaf spot on actinidia plants, are known as phaseolotoxin producers, and the former possesses phaseolotoxin-resistant ornithine carbamoyltransferase (ROCT) which confers resistance to the toxin. We confirmed that the latter is also resistant to phaseolotoxin and possesses ROCT, and we compared the two pathovars by using sequence data of the ROCT gene and the intergenic spacer region located between the 16S and 23S rRNA genes (16S-23S spacer region) as an index. It was found that the identical ROCT gene (argK) is contained not only in bean isolates of P. syringae pv. phaseolicola in Mexico and the United States but also in bean isolates in Japan and Canada, and that it is also distributed in the kudzu (Pueraria lobata) isolates of P. syringae pv. phaseolicola. Moreover, the kiwifruit and tara vine isolates of P. syringae pv. actinidiae were also found to possess the identical argK. On the contrary, the 16S-23S spacer regions showed a significant level of sequence variation between P. syringae pv. actinidiae and pv. phaseolicola, suggesting that these two pathovars evolved differently from each other in the phylogenetic development. The fact that even synonymous substitution has not occurred in argK among these strains despite their extreme differences in phylogenetic evolution and geographical distribution suggests that it was only recently in evolutionary time that argK was transferred from its origin to P. syringae pv. actinidiae and/or pv. phaseolicola.

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Selected References

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