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首页> 外文期刊>Archives of Agronomy and Soil Science >Effect of arbuscular mycorrhizal fungi on rhizosphere organic acid content and microbial activity of trifoliate orange under different low P conditions
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Effect of arbuscular mycorrhizal fungi on rhizosphere organic acid content and microbial activity of trifoliate orange under different low P conditions

机译：丛枝菌根真菌对不同低P条件下Trifoliate橙色根际有机酸含量和微生物活性的影响

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摘要

Arbuscular mycorrhizal (AM) fungi can improve plant phosphorus (P) uptake; however, information about how AM fungi affect rhizosphere organic acid and microbial activity to alleviate citrus low P stress is limited. Here, a pot experiment was conducted to evaluate the effect of AM fungi (Rhizophagus intraradices, Ri) inoculation on rhizosphere organic acid content, microbial biomass (MB) and enzyme activity of trifoliate orange (Poncirus trifoliata L. Raf.) seedlings grown under three low P conditions. The results showed that mycorrhizal seedlings all recorded higher P concentrations, plant biomass and better root morphology with more lateral and fine roots, but lower root mass ratios, irrespective of P conditions. Mycorrhizal P absorption contribution did not differ significantly among three P conditions. Mycorrhizal seedling rhizosphere soil exhibited lower organic acid content, soil organic P content and ratio of MB-carbon (C)/MB-P, but higher MB and enzyme activity. Additionally, the main organic acids showed a negative relationship with mycorrhizal colonization rate and hyphal length; however, phosphatase and phytase activity had a significantly positive relationship with MB. Therefore, the results suggest that AM fungi inoculation may help citrus to efficiently utilize organic P source by improving microbial activity under low available P conditions.
机译：丛枝菌根（AM）真菌可以改善植物磷（P）摄取;然而，有关am Fungi如何影响根际有机酸和微生物活性以缓解柑橘的信息的信息是有限的。在这里，进行了罐实验以评估AM真菌（根瘤菌内，RI）接种对根际有机酸含量，微生物生物量（MB）和Trifoliate橙（Poncirus Trifoliata L. Raf的酶活性的影响。幼苗低P条件。结果表明，菌根幼苗全部记录了较高的P浓度，植物生物质和更好的根形态，而具有更多的横向和细根，而是较低的根质量比，而不管P病例如何。在三个P条件下，腐蚀性P吸收贡献没有显着差异。菌根幼苗根际土壤表现出较低的有机酸含量，土壤有机P含量和MB - 碳（C）/ MB-P的比例，但MB和酶活性更高。另外，主要有机酸与菌根定植率和悬垂长度显示出负面关系;然而，磷酸酶和植酸酶活性与MB具有显着阳性的关系。因此，结果表明，AM真菌接种可以通过改善低可用P条件下改善微生物活性来有助于柑橘有效利用有机P源。

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