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Nodulation of rooibos (Aspalathus linearis Burm. f.), an indigenous South African legume, by members of both the α-Proteobacteria and β-Proteobacteria

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Abstract

Rooibos (Aspalathus linearis) has been reported to be nodulated by rhizobia belonging to members of the genus Bradyrhizobium but based solely on slow growth rate on growth media in vitro. Because there is very little information about the rhizobia that nodulate and fix nitrogen in rooibos, the characterization of rhizobial strains and their ability to nodulate A. linearis was investigated in this study. Soils intially collected from the rhizosphere of different Aspalathus populations were used in a baiting experiment to trap rhizobia by rooibos roots. The rhizobia trapped in the nodules were re-isolated and used in Koch’s postulate experiment using the Leonard jar assembly in the glasshouse. The strains that formed on the average between five and 12 indeterminate pink nodules per plant resulted in statistically significant (P = 0.05) increase in shoot and root dry weights. Phylogenetic analysis of the 16S ribosomal RNA sequence of the isolates from the root nodules revealed for the first time that A. linearis is nodulated by different groups of rhizobia belonging to members of both the α-Proteobacteria and the β-Proteobacteria. It was also found that only 2% of the total rhizobia isolated from the root nodules of rooibos were represented by the genus Bradyrhizobium. The finding that rooibos is nodulated by different groups of α-rhizobia and β-rhizobia provides valuable information both in the study of the microbial ecology of rooibos and in the selection of highly efficient nitrogen fixing strains for the commercial cultivation of this indigenous legume.

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Acknowledgement

The authors would like to acknowledge the South African Rooibos Council and the Agricultural Research Council (ARC) for the financial support provided, Prof Ben-Eric van Wyk for the identification of the localities where soil samples from wild rooibos populations were collected, Dr Elize Jooste for reading the manuscript and providing valuable comments, Mr Frikkie Calitz from the Biometry unit of the ARC for his advise and support in the statistical analysis, the technical assistance of Johan Brand (Rooibos Ltd.) and staff of the Soilborn Plant Diseases Unit and Nitrogen Fixation Unit of the ARC-Plant Protection Research Institute to accomplish this project.

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Authors and Affiliations

  1. ARC-Plant Protection Research Institute (ARC-PPRI), Private bag X134, Queenswood, Pretoria, 0121, South Africa

    Ahmed Idris Hassen, Francina Lebogang Bopape & Johannes Habig

  2. ARC-Plant Protection Research Institute (ARC-PPRI), Private bag X5017, Stellenbosch, 7599, South Africa

    Sandra Christina Lamprecht

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  1. Ahmed Idris Hassen
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  2. Francina Lebogang Bopape
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  3. Johannes Habig
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  4. Sandra Christina Lamprecht
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Correspondence to Ahmed Idris Hassen.

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Figure S1

Glasshouse nodulation trial of A. linearis using the Koch’s postulate experiment. Inoculation with strains SARCC-RB8C (Rhizobium), SARCC-RB10h (Herbasprillum) and SARCC-RB14i (Burkholderia) resulted in enhanced growth with well developed shoot (Ai, ii, iii) and in the formation of indeterminate, pink nodules (Bi, ii, ii) respectively. (JPEG 80 kb)

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Hassen, A.I., Bopape, F.L., Habig, J. et al. Nodulation of rooibos (Aspalathus linearis Burm. f.), an indigenous South African legume, by members of both the α-Proteobacteria and β-Proteobacteria. Biol Fertil Soils 48, 295–303 (2012). https://doi.org/10.1007/s00374-011-0628-3

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  • DOI: https://doi.org/10.1007/s00374-011-0628-3

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