Oligopeptides Represent a Preferred Source of Organic N Uptake: A Global Phenomenon?
Oligopeptides Represent a Preferred Source of Organic N Uptake: A Global Phenomenon?
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DOI：
10.1007/s10021-012-9601-8
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发表时间：
2013-01-01
期刊：
影响因子：
3.7
通讯作者：
Jones, Davey L.
中科院分区：
文献类型：
--
作者：
Farrell, Mark;Hill, Paul W.;Jones, Davey L.
在过去的20年里，我们对土壤氮循环的理解发生了变化，有证据表明氨基酸是土壤微生物和植物的主要底物。然而，最近发现植物和微生物可以直接利用土壤中的小肽，这一发现需要对其生态意义进行评估，因为肽在蛋白质分解中释放得更早，因此将为任何可以直接利用它们的生物提供显着的竞争优势。我们测试了土壤微生物在广泛的生态系统中是否比氨基酸吸收肽更快。我们发现l-对映体-肽- n的吸收速度明显快于等效单体，这在不同生态系统的土壤中是普遍的，具有不同的微生物群落。肽可能在陆地氮循环中具有未被认识到的全球性重要性，在比以前认识到的更早的分解阶段为土壤微生物提供氮。
Over the past 20 years, our understanding of soil nitrogen (N) cycling has changed with evidence that amino acids are major substrates for both soil microorganisms and plants. However, the recent discovery that plants and microorganisms can directly utilize small peptides in soil needs to be evaluated for its ecological significance, because peptides are released earlier in protein decomposition and thus would provide significant competitive advantage to any organism that can use them directly. We tested whether soil microorganisms took up peptides faster than amino acids across a broad range of ecosystems. We show that l-enantiomeric-peptidic-N is taken up significantly faster than the equivalent monomer, and that this is universal across soils from different ecosystems, with distinct microbial communities. Peptides may have an unrecognized, global, importance in the terrestrial N cycle, providing N to soil microorganisms at an earlier stage of decomposition than previously acknowledged.