The Determination of the Taxonomic Status of Two Soil Rhizobia from Southern Tibet Genetic diversity and phylogeny of rhizobia isolated from white clover in Sichuan Province Screening of reference genes in Siraitia grosvenorii and spatio-temporal expression analysis of 3-hydroxy-3-methylglutaryl coenzyme A Detection of Pseudomonas syringae pv. maculicola from imported rape seeds