Synergies between mycorrhizal fungi and soil microbial communities increase plant nitrogen acquisition.,Communications Biology

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Synergies between mycorrhizal fungi and soil microbial communities increase plant nitrogen acquisition.
Communications Biology ( IF 5.2 ) Pub Date : 2019-06-21 , DOI: 10.1038/s42003-019-0481-8
Rachel Hestrin ₁ , Edith C Hammer ₂ , Carsten W Mueller ₃ , Johannes Lehmann _{1,

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Affiliation

Nitrogen availability often restricts primary productivity in terrestrial ecosystems. Arbuscular mycorrhizal fungi are ubiquitous symbionts of terrestrial plants and can improve plant nitrogen acquisition, but have a limited ability to access organic nitrogen. Although other soil biota mineralize organic nitrogen into bioavailable forms, they may simultaneously compete for nitrogen, with unknown consequences for plant nutrition. Here, we show that synergies between the mycorrhizal fungus Rhizophagus irregularis and soil microbial communities have a highly non-additive effect on nitrogen acquisition by the model grass Brachypodium distachyon. These multipartite microbial synergies result in a doubling of the nitrogen that mycorrhizal plants acquire from organic matter and a tenfold increase in nitrogen acquisition compared to non-mycorrhizal plants grown in the absence of soil microbial communities. This previously unquantified multipartite relationship may contribute to more than 70 Tg of annually assimilated plant nitrogen, thereby playing a critical role in global nutrient cycling and ecosystem function.

中文翻译：

菌根真菌和土壤微生物群落之间的协同作用增加了植物氮的获取。

氮的可用性常常限制陆地生态系统的初级生产力。丛枝菌根真菌是陆地植物普遍存在的共生体，可以改善植物氮的获取，但获取有机氮的能力有限。尽管其他土壤生物群将有机氮矿化成生物可利用的形式，但它们可能同时竞争氮，这对植物营养造成未知的后果。在这里，我们表明，菌根真菌不规则根霉和土壤微生物群落之间的协同作用对模型草短柄草的氮获取具有高度非加性效应。这些多方微生物协同作用导致菌根植物从有机物中获取的氮量增加一倍，与在缺乏土壤微生物群落的情况下生长的非菌根植物相比，氮获取量增加十倍。这种以前未量化的多方关系可能有助于每年同化植物氮超过 70 Tg，从而在全球养分循环和生态系统功能中发挥关键作用。

更新日期：2019-06-21

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