Distribution of Pseudomonas syringae pathovars into twenty-three O serogroups

Article Abstract:

Three hundred fifty five strains of Pseudomonas syringae, comprising 15 pathovars, are categorized into 23 O serogroups. These are identifiable via double-diffusion reactions of the soluble lipopolysaccharides (LPSs) and O serogroups of P. syringae and viridiflava. The serogroups are identified on the basis of the reaction of the type strains. Twelve serogroups belonging to two families have antigenic cross-reactivity, 10 have a specific reactivity and one serogroup has side-chain deficient LPSs. Some pathovars are homogenous while others are heterogeneous.

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Specific bacterial suppressors of MAMP signaling upstream of MAPKKK in Arabidopsis innate immunity

Article Abstract:

A cell-based genetic screen of virulence factors helped to identify AvrPto and AvrPtoB as potent and unique suppressors of early defense screen gene transcription and MAP kinase signaling. The studies revealed a fundamental role of microbe-associated molecular pattern (MAMP) signaling in nonhost immunity, and a novel action of type III effectors from pathogenic bacteria.

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Diverse AvrPtoB homologs from several Pseudomonas syringae pathovars elicit pto-dependent resistance and have similar virulence activities

Article Abstract:

The characterization of avrPtoB homologs from Pseudomonas syringae pv. tomato T1, PT23, and JL1065, P. syringae pv. syringae B728a, and P. syringae pv. maculicola ES4326 is described. It is observed that AvrPtoB homologs from diverse P. syringae pathovers have conserved avirulence and virulence activities similar to AvrPtoB activity, in spite of divergent sequences.

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