Journal
NEW PHYTOLOGIST
Volume 205, Issue 3, Pages 1183-1194Publisher
WILEY
DOI: 10.1111/nph.13175
Keywords
cerrado; dauciform roots; leaf manganese (Mn) concentration; leaf nutrient concentrations; mycorrhizas; nitrogen:phosphorus (N:P) ratio; phosphorus nutrition; sand-binding roots
Categories
Funding
- Department of Plant Biology
- Graduate Program on Ecology at Unicamp
- CAPES
- FAPESP [2013/19555-2, 2010/17204-0]
- University of Western Australia
- School of Plant Biology
- Brazilian National Council for Scientific Research [CNPq 474670/2008-2]
- Australian Research Council (ARC) [DP0985685, DP110101120]
- ANZ Holsworth Wildlife Foundation
- Mary Janet Lindsay of Yanchep Memorial Fund
- CNPq
- Australian Research Council [DP0985685] Funding Source: Australian Research Council
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In Brazil, the campos rupestres occur over the Brazilian shield, and are characterized by acidic nutrient-impoverished soils, which are particularly low in phosphorus (P). Despite recognition of the campos rupestres as a global biodiversity hotspot, little is known about the diversity of P-acquisition strategies and other aspects of plant mineral nutrition in this region. To explore nutrient-acquisition strategies and assess aspects of plant P nutrition, we measured leaf P and nitrogen (N) concentrations, characterized root morphology and determined the percentage arbuscular mycorrhizal (AM) colonization of 50 dominant species in six communities, representing a gradient of soil P availability. Leaf manganese (Mn) concentration was measured as a proxy for carboxylate-releasing strategies. Communities on the most P-impoverished soils had the highest proportion of nonmycorrhizal (NM) species, the lowest percentage of mycorrhizal colonization, and the greatest diversity of root specializations. The large spectrum of leaf P concentration and variation in root morphologies show high functional diversity for nutritional strategies. Higher leaf Mn concentrations were observed in NM compared with AM species, indicating that carboxylate-releasing P-mobilizing strategies are likely to be present in NM species. The soils of the campos rupestres are similar to the most P-impoverished soils in the world. The prevalence of NM strategies indicates a strong global functional convergence in plant mineral nutrition strategies among severely P-impoverished ecosystems.
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