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Effects of dual inoculation of AMF and rhizobium on alfalfa (Medicago sativa) root rot caused by Microdochium tabacinum

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Abstract

This experiment aimed to test the combined effects of arbuscular mycorrhizal fungi (AMF) and rhizobium (Sinorhizobium medicae) on the alfalfa root rot (Microdochium tabacinum) disease. The results show a significant increase in alfalfa growth, induced by AMF, independent of inoculation with rhizobium. Inoculation with S. medicae increased alfalfa N concentration compared with un-inoculated plants. In the presence of both AMF and S. medicae, the N, P concentration of plant were significantly greater than in their absence. M. tabacinum caused plant branches wilt and significantly reduced plant total dry weight as well as N, P concentration. Inoculation of AMF increased nodule numbers, independent of the presence of other factors. AMF and rhizobium reduced alfalfa branches discoloration by 18%. Plant disease related enzyme, peroxidase (POD), and catalase (CAT) showed a positive response to both AMF and rhizobium, while the malondialdehyde (MDA) content responded negative.

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Acknowledgements

This research was financially supported by China Agriculture Research System-Green manure (CARS-22) and The National Natural Science Foundation (31100368).

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Correspondence to Tingyu Duan.

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Gao, P., Guo, Y., Li, Y. et al. Effects of dual inoculation of AMF and rhizobium on alfalfa (Medicago sativa) root rot caused by Microdochium tabacinum. Australasian Plant Pathol. 47, 195–203 (2018). https://doi.org/10.1007/s13313-018-0543-2

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  • DOI: https://doi.org/10.1007/s13313-018-0543-2

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