Abstract
The ecological restoration of nickel mining-degraded areas in New Caledonia is strongly limited by low availability of soil mineral nutrients, metal toxicity, and slow growth rates of native plant species. In order to improve plant growth for restoration programs, special attention was paid to interactions between plant and soil microorganisms. In this study, we evaluated the influence of inoculation with Curtobacterium citreum BE isolated from a New Caledonian ultramafic soil on arbuscular mycorrhizal symbiosis and growth of Tetraria comosa, an endemic sedge used in restoration programs. A greenhouse experiment on ultramafic substrate was conducted with an inoculum comprising two arbuscular mycorrhizal fungi (AMF) species isolated from New Caledonian ultramafic soils: Rhizophagus neocaledonicus and Claroideoglomus etunicatum. The effects on plant growth of the AMF and C. citreum BE inoculated separately were not significant, but their co-inoculation significantly enhanced the dry weight of T. comosa compared with the non-inoculated control. These differences were positively correlated with mycorrhizal colonization which was improved by C. citreum BE. Compared with the control, co-inoculated plants were characterized by better mineral nutrition, a higher Ca/Mg ratio, and lower metal translocation. However, for Ca/Mg ratio and metal translocation, there were no significant differences between the effects of AMF inoculation and co-inoculation.
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Acknowledgments
The authors thank the LAMA laboratory (LAMA-US IMAGO-IRD, New Caledonia) for chemical analyses and M. Voide for technical support.
Funding
We are very grateful to the South Province of New Caledonia for providing the PhD grant of Alexandre Bourles. This work was supported by the Province Sud of New Caledonia (Prix d’Encouragement à la Recherche: Thesis Grant).
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A.B. designed the study, performed the research, analyzed the data, and wrote the paper; L.G. designed the study and wrote the paper; C.C. performed the research and analyzed the data; S.G analyzed the data; C.M. performed the research; T.C. provided AMF inoculum, designed the study, and wrote the paper; Y.C. designed the study; V.B.S. wrote the paper and provided the funding; P.J. designed the study and wrote the paper; H.A. supervised the study, analyzed the data, wrote the manuscript, and provided the funding.
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Bourles, A., Guentas, L., Charvis, C. et al. Co-inoculation with a bacterium and arbuscular mycorrhizal fungi improves root colonization, plant mineral nutrition, and plant growth of a Cyperaceae plant in an ultramafic soil. Mycorrhiza 30, 121–131 (2020). https://doi.org/10.1007/s00572-019-00929-8
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DOI: https://doi.org/10.1007/s00572-019-00929-8