Journal
NATURE CLIMATE CHANGE
Volume 1, Issue 1, Pages 50-53Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NCLIMATE1060
Keywords
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Funding
- UK Natural Environment Research Council [AFI8/08]
- Natural Environment Research Council [NE/D00893X/1, NE/E013732/1, bas0100025, lsmsf010003, NER/G/S/2003/00008, ceh010023] Funding Source: researchfish
- NERC [NE/D00893X/1, NE/E013732/1, lsmsf010003, bas0100025] Funding Source: UKRI
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For the past 50 years there has been rapid warming in the maritime Antarctic(1-3), with concurrent, and probably temperature-mediated, proliferation of the two native plants, Antarctic pearlwort (Colobanthus quitensis) and especially Antarctic hair grass (Deschampsia antarctica)(4-10). In many terrestrial ecosystems at high latitudes, nitrogen (N) supply regulates primary productivity(11-13). Although the predominant view is that only inorganic and amino acid N are important sources of N for angiosperms, most N enters soil as protein. Maritime Antarctic soils have large stocks of proteinaceous N, which is released slowly as decomposition is limited by low temperatures. Consequently, an ability to acquire N at an early stage of availability is key to the success of photosynthetic organisms. Here we show that D. antarctica can acquire N through its roots as short peptides, produced at an early stage of protein decomposition, acquiring N over three times faster than as amino acid, nitrate or ammonium, and more than 160 times faster than the mosses with which it competes. Efficient acquisition of the N released in faster decomposition of soil organic matter as temperatures rise(14) may give D. antarctica an advantage over competing mosses that has facilitated its recent proliferation in the maritime Antarctic.
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