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.

中文翻译：

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与细菌和丛枝菌根真菌一起接种可改善根基定殖，植物矿物质营养以及莎草科植物在超镁铁质土壤中的生长

新喀里多尼亚镍矿开采退化地区的生态恢复受到土壤矿物养分利用率低，金属毒性以及原生植物物种生长速度缓慢的限制。为了改善植物生长以进行恢复计划，特别注意了植物与土壤微生物之间的相互作用。在这项研究中，我们评估接种的影响Curtobacterium属明串珠菌从上丛枝菌根共生和生长的新喀里多尼亚超镁铁质土壤中分离Tetraria comosa，在恢复程序中使用的一种地方病莎草。用包含两种从新喀里多尼亚超镁铁质土壤分离的丛枝菌根真菌（AMF）菌种的接种物进行了超镁铁质基质的温室试验：新根瘤菌（Rhizophagus neocaledonicus）和Claroideoglomus etunicatum。分别接种AMF和柑桔梭菌BE对植物生长的影响并不显着，但与未接种对照相比，它们的共同接种显着提高了玉米粉虱的干重。这些差异与柑桔菌改善的菌根定植呈正相关。是。与对照相比，共同接种的植物具有更好的矿物质营养，更高的Ca / Mg比和更低的金属易位性。但是，对于Ca / Mg比例和金属易位，AMF接种和共接种之间没有显着差异。