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首页> 外文期刊>Applied Microbiology >Laccaria bicolor Mobilizes both Labile Aluminum and Inorganic Phosphate in Rhizosphere Soil of Pinus massoniana Seedlings Field Grown in a Yellow Acidic Soil
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Laccaria bicolor Mobilizes both Labile Aluminum and Inorganic Phosphate in Rhizosphere Soil of Pinus massoniana Seedlings Field Grown in a Yellow Acidic Soil

机译：Laccaria Bicolor在黄色酸性土壤中生长的Pinus Massoniana幼苗田的根际土壤中动员了无奈铝和无机磷酸盐

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Plant growth is often limited by highly activated aluminum (Al) and low available phosphorus (P) in acidic soil. Ectomycorrhizal (ECM) fungi can improve their host plants’ Al tolerance by increasing P availability while decreasing Al activity in vitro or in hydroponic or sand culture systems. However, the effect of ECM fungi on inorganic P (IP) and labile Al in acidic soil in the field, particularly in conjunction with Al treatment, remains poorly understood. The present study aimed to determine the influence of ECM fungal association on the mobilization of IP and labile Al in rhizosphere soil of host plants grown in the field with external Al treatment and the underlying nutritional mechanism in plant Al tolerance. To do so, 4-week-old Pinus massoniana seedlings were inoculated with three ECM isolates ( Laccaria bicolor 270, L. bicolor S238A, and L. bicolor S238N) and grown in a Haplic Alisol field with or without Al treatment for 12?weeks. Results showed that L. bicolor association enhanced the available P depletion and facilitated the mobilization of IP and labile Al, in turn improving the capacity of host plant to use Al-bound P, Ca-bound P, and occluded P, particularly when P. massoniana seedlings were inoculated with L. bicolor S238A. Inoculation with L. bicolor isolates also enhanced the solubility of labile Al and facilitated the conversion of acid-soluble Al into exchangeable Al. Our findings suggested that ECM inoculation could enhance plant Al tolerance in the field by mobilizing IP to improve the P bioavailability but not by decreasing Al activity.IMPORTANCE Here, we reveal the underlying nutritional mechanism in plant Al tolerance conferred by ectomycorrhizal (ECM)-fungus inoculation in the field and report the screening of a promising ECM isolate to assist phytoremediation and afforestation using Pinus massoniana in acidic soil in southern China. This study advances our understanding of the contribution of ECM fungi to plant–ECM-fungus symbiosis and highlights the vital role of ECM-fungus inoculation in plant Al tolerance. In addition, the results described in the present study confirm the importance of carrying out studies in the field rather than only in vitro studies. Our findings strengthen our understanding of the role of ECM-fungus association in detecting, utilizing, and transporting unavailable nutrients in the soil to enhance host plant growth and adaptability in response to adverse habitats.
机译：植物生长通常受酸性土壤中高活性铝（Al）和低可用磷（P）的限制。通过增加P可用性，同时在体外或水培或砂培养系统中降低Al活性，Eccycorrhizal（ECM）真菌可以通过增加P可用性来改善宿主植物的Al耐受性。然而，ECM真菌对现场酸性土壤（IP）和不稳定AL的影响，特别是与Al治疗结合，仍然清楚地理解。本研究旨在确定ECM真菌协会对外部Al治疗生长的宿主植物根际土壤中IP和不稳定Al的影响，植物AL耐受性营养机制。为此，用三个ECM分离株（Laccaria双色270，L.Bicolor S238A和L.Bicolor S238N）接种4周龄Pinus Massoniana幼苗，并在具有或没有Al治疗的单位的Alisol场中生长12？周。结果表明，L.双子合作增强了可用的P消耗，并促进了IP和不稳定的人员，反过来改善了宿主植物的能力，使用Al-Bunal P，Ca-Land P和闭塞P，特别是当P.时用L.Bicolor S238a接种Massoniana幼苗。与L.双子分离物接种还增强了不稳定的Al的溶解度，并促进了酸溶解的转化为可更换的Al。我们的研究结果表明，ECM接种可以通过动员IP来提高该领域的植物耐受性，以改善P生物利用度，而不是通过降低Al Activity.Importance，我们揭示了Eccocrohizal（ECM）赋予的植物Al耐受性的潜在营养机制在该领域接种并报告筛选有前途的ECM分离物，以促进中国南方酸性土壤中Pinus Massoniana的植物修复和造林。本研究进展了我们对ECM真菌对植物 - ECM-FINGUS共生的贡献的理解，并突出了ECM-FIGGUS接种在植物AL耐受性中的重要作用。此外，本研究中描述的结果证实了在现场进行研究而不是仅在体外研究中进行研究的重要性。我们的调查结果加强了我们对ECM-FIGGUS协会在土壤中检测，利用和运输不可用营养的作用的理解，以增强宿主植物的生长和适应性，以应对不良栖息地。

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