Assessing host range, symbiotic effectiveness, and photosynthetic rates induced by native soybean rhizobia isolated from Mozambican and South African soils

Symbiosis
Cynthia GyogluuFelix D Dakora

Abstract

Host range and cross-infectivity studies are important for identifying rhizobial strains with potential for use as inoculants. In this study, 10 native soybean rhizobia isolated from Mozambican and South African soils were evaluated for host range, symbiotic effectiveness and ability to induce high rates of photosynthesis leading to enhanced plant growth in cowpea (Vigna unguiculata L. Walp.), Bambara groundnut (Vigna subterranean L. Verdc.), Kersting's groundnut (Macrotyloma geocarpum Harm) and soybean (Glycine max L. Merr). The test isolates had different growth rates and colony sizes. Molecular analysis based on enterobacterial repetitive intergenic consensus (ERIC)-PCR revealed high genetic diversity among the test isolates. The results further showed that isolate TUTLBC2B failed to elicit nodulation in all test plants, just as TUTNSN2A and TUTDAIAP3B were also unable to nodulate cowpea, Kersting's bean and Bambara groundnut. Although the remaining strains formed ineffective nodules on cowpea and Kersting's bean, they induced effective nodules on Bambara groundnut and the two soybean genotypes. Bacterial stimulation of nodule numbers, nodule dry weights and photosynthetic rates was generally greater with isolates TUTRSRH3A,...Continue Reading

References

Dec 1, 1971·The Biochemical Journal·W J Broughton, M J Dilworth
Apr 3, 1999·Molecular Plant-microbe Interactions : MPMI·S G Pueppke, W J Broughton
Aug 27, 2009·Applied Microbiology and Biotechnology·Anthony O Adesemoye, Joseph W Kloepper
Aug 6, 2010·Research in Microbiology·Kristina LindströmNora Altier
Aug 9, 2011·Journal of Photochemistry and Photobiology. B, Biology·Shardendu K Singh, K Raja Reddy

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Methods Mentioned

BETA
PCR
electrophoresis

Software Mentioned

NTSYS pc
STATISTICA
UPGMA

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