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Isolation and Identification of Mulberry Rhizospheric Silicate Bacteria and Determination of Their Potassium-releasing Activities

WU Fan1,2 LIU Xun-Li1 ZHANG Nan1 ZHANG Sha-Sha1 GUO Hui1 ZHANG Ben-Feng1 QIU Nian-Quan1(1College of Forestry,Shandong Agricultural University,Taian Shandong 271018,China;2Industrial Crops Institute of Hubei Academy of Agricultural Sciences,Wuhan 430064,China)  
29 bacterial isolates that had potassium-releasing activities were obtained from mulberry rhizospheric soil through cultivation with selective media.Analysis of repetitive-element PCR(rep-PCR)genomic DNA fingerprinting identified 24 silicate bacteria from them.Determination of their potassium-releasing activities indicated that 7 isolates,i.e.FK2,FK3,FK8,FK11,FK4',FK23 and PK18,had high potassium-releasing activities,among which FK2 had the highest potassium-releasing activity.Its available potassium increment reached 41.79%.Observations on morphological features of bacterial colonies and phylogenetic analysis of 16S rDNA sequences to the 7 isolates with high potassium-releasing activity revealed that FK2 belonged to Pseudomonas sp.,FK3 and FK23 belonged to Sinorhizobium sp.,FK11 and FK8 belonged to Rhizobium sp.,FK4' belonged to Mesorhizobium sp.,and PK18 belonged to Flexibacter sp.
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