Molecular Cloning and Bioinformatics Analysis of T3SS Chaperone Escort Protein VscO from Vibrio alginolyticus Comparative analysis of type-III secretion system and T3SS-secreted effectors among seven quarantine Xanthomonas pathovars Analysis of regulatory relationship between stringent response related gene spoTXcc and T3SS genes in Xanthomonas campestris pv. campestris