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首页> 外文期刊>Plant and Soil >Apatite as a P source in mycorrhizal and non-mycorrhizal Pinus sylvestris seedlings.
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Apatite as a P source in mycorrhizal and non-mycorrhizal Pinus sylvestris seedlings.

机译：磷灰石作为菌根和非菌根樟子松幼苗中的P源。

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A study was conducted to test the ability of ectomycorrhizal pine seedlings to use apatite as a P source in comparison with non-mycorrhizal pine seedlings, and to determine if a relationship exists between the exudation of organic acids and the ability to use apatite as a P source. Non-mycorrhizal Pinus sylvestris seedlings, and seedlings ectomycorrhizal with 4 different isolates of ectomycorrhizal fungi, were grown for 220 days in sand/peat-filled pots with apatite (Ca5(F,OH)(PO4)3) as the sole Psource. In an additional experiment, non-mycorrhizal P. sylvestris seedlings, and seedlings ectomycorrhizal with 2 different isolates of ectomycorrhizal fungi, were grown without a P source for 250 days. All other nutrients were supplied. The growth of ectomycorrhizal seedlings was less than non-mycorrhizal seedlings, although they produced a large external mycelium not included in the biomass estimates. All seedlings exhibited low shoot:root ratios compared to seedlings grown under optimal conditions.All seedlings grown with apatite as P source exhibited higher foliar P concentrations (0.71-2.11 mg/g) than seedlings growing without a P source (0.57-0.75 mg/g), indicating a significant ability to use apatite as a P source. Seedlings colonized by Suillus variegatus and Paxillus involutus exhibited higher concentrations and total P contents in shoots compared with non-mycorrhizal seedlings, indicating a significantly greater P uptake by these fungi in comparison with non-mycorrhizal seedlings or seedlings colonized by Piloderma croceum. No clear relationship between the exudation of organic acids and P uptake was observed. Seedlings colonized by S. variegatus reduced the pH of the soil more than seedlings colonized by P. involutus or non-mycorrhizal seedlings. It is suggested that S. variegatus colonization may improve P uptake by reducing the pH of the soil, while P. involutus may result in greater P uptake because of greater absorption of dissolved phosphate compared to non-mycorrhizal roots or roots colonized by the other fungi used in the study.
机译：进行了一项研究，以检验与非菌根松树幼苗相比，外生菌根松树苗使用磷灰石作为磷源的能力，并确定有机酸渗出与使用磷灰石作为磷素的能力之间是否存在关系。资源。将非菌根的樟子松幼苗和带有4种不同的菌根真菌分离株的菌根幼苗在装有磷灰石（Ca5（F，OH）（PO4）3）作为唯一磷源的砂/豌豆盆中种植220天。在另外的实验中，无根真菌的樟子松幼苗和带有两种不同的外生菌根真菌分离株的外生菌根生长了250天。提供了所有其他营养素。外生菌根幼苗的生长少于非生根菌幼苗，尽管它们产生的大量外部菌丝体没有包括在生物量估计中。与在最佳条件下生长的幼苗相比，所有幼苗的茎根比均较低。所有以磷灰石为磷源的幼苗的叶面磷浓度（0.71-2.11 mg / g）比没有磷源的幼苗（0.57-0.75 mg / g）高g），表明使用磷灰石作为磷源的显着能力。与非菌根苗相比，由变异牛肝菌和渐开线Paxillus involutus定殖的幼苗在芽中表现出更高的浓度和总P含量，这表明与非菌根苗或由毛霉菌定殖的幼苗相比，这些真菌对P的吸收显着更高。观察到有机酸的渗出与磷的吸收之间没有明确的关系。由变异链球菌定殖的幼苗比被渐隐线虫或非菌根苗定殖的幼苗降低的土壤pH值更大。有证据表明，与非菌根或其他真菌定殖的根相比，变异链球菌定植可能通过降低土壤的pH值来提高磷的吸收，而渐隐线菌可能由于较高的溶解磷吸收而导致更大的磷吸收。在研究中使用。

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