16S rDNA-RFLP Analysis of Rhizobia Isolated from Thermopsis 16S rDNA and nifA Gene Sequence Analysis of Rhizobium Strain HJ06 Isolated from Acacia crassicarpa Screening and inhibition of antagonistic endophytic bacteria isolated from soybean (Glycine max) nodules against Alternaria longipes. Allelopathy and the rhizospere bacterial community structure of Oxytropis ochrocephala Diversity and Phylogeny of Rhizobium Isolated from Root Nodules of Legumes in Jiuquan and Other Regions,Gansu