Sequences analysis of 16S rDNA and rp genes of the phytoplasma associated with jujube witches′-broom (JWB) from Hubei Province Identification of genes regulating hrpG expression in Xanthomonas oryzae pv. oryzae An analysis of salt tolerance of transgenic alfalfa with the GsGST13/SCMRP gene Regulation of expression of type Ⅲ secretion system-encoded hrp genes of Xanthomonas oryzae pv. oryzae by diffusible signal factor-mediated quorum sensing