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QUANTIFICATION OF SOYBEAN-ASSOCIATED SOIL RHIZOBIA WITH QUANTITATIVE POLYMERASE CHAIN REACTION Branden Furseth, Shawn Conley, Jean-Michel Ané Dept. of.

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© The Author(s) 2014. Published by Science and Education Publishing. Table 1. List of strains of rhizobia used in the glasshouse Koch’s postulate experiment for nodulation of selected indigenous and exotic forage legumes and similarities of the 16S ribosomal RNA sequences of the isolates with that of reference strains from GenBank Rhizobia SARCC1 Strains strain code Original host Glasshouse test2 (Nod+/-) 16S rRNA sequence BLAST search3 % similarity XBQ5 SARCC-401 Desmodium uncinatum D. uncinatum (+) Bradyrhizobium elkanii CCBAU53142 99% XBD2 SARCC-388 Cyamopsis tetragonoloba Vigna unguiculata (+) B. japonicum SEMIA 6439 XHF1 SARCC-465 Vigna unguiculata Sinorhizobium meliloti CCNWX0515 98% XHF3 SARCC-470 B. japonicum strain H1 XHF12 SARCC-467 Vigna unguiculata(+) Stylosanthus gracillis (+) B. japonicum CCBAU53152 XHF14 SARCC-469 Vigna sp. (+) Bradyrhizobium sp. CCBAU 2303 XHH1 SARCC-508 Rhizobium sp. UMR 7363 97% XBU3 SARCC-404 Dolichos axillaries Macrotyloma axillare (+) B. japonicum NA110 XBU4 SARCC-405 Dolichos formosus B. elkani CCBAU 33018 91% XBV7 SARCC408 Dolichos lablab B. yaunmingense MN-S XHG1 SARCC504 Stylosanthus gracilis Stylosanthus gracilis (+) Bradyrhizobium sp IV-123 XGA1 SARCC483 Desmodium nacaraguence Desmodium uncinatum(+) B. elkanii USDA 4348 XGE1 SARCC-488 Indigofera hirsuta Indigofera spicata (+) XCG2 SARCC-412 B. japonicum CCBAU 53142 XGO1 SARCC-495 SA59-2c SARCC-597 Bradyrhizobium sp. UFLO4 SA59-2e SARCC-599 Bradyrhizobium sp. SEMIA 929 SA59-2f SARCC-600 B. japonicum SEMIA 6002 1SARCC = South African Rhizobium Culture Collection. 2The glasshouse Koch’s postulate was tested on these legumes. (+)= nodulation, (-) absence of nodules 3 The 16S ribosomal RNA sequences of all the rhizobium strains used in this study were compared with available sequences in the NCBI data bases to establish their phylogenetic relationships. Ahmed Idris Hassen et al. Nodulation Study and Characterization of Rhizobial Microsymbionts of Forage and Pasture Legumes in South Africa. World Journal of Agricultural Research, 2014, Vol. 2, No. 3, 93-100. doi:10.12691/wjar-2-3-2 © The Author(s) 2014. Published by Science and Education Publishing.