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Type: Artigo de periódico
Title: Mineral Nutrition Of Campos Rupestres Plant Species On Contrasting Nutrient-impoverished Soil Types.
Author: Oliveira, Rafael S
Galvão, Hugo C
de Campos, Mariana C R
Eller, Cleiton B
Pearse, Stuart J
Lambers, Hans
Abstract: 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.
Subject: Cerrado
Dauciform Roots
Leaf Manganese (mn) Concentration
Leaf Nutrient Concentrations
Nitrogen : phosphorus (n : p) Ratio
Phosphorus Nutrition
Sand-binding Roots
Citation: The New Phytologist. v. 205, n. 3, p. 1183-94, 2015-Feb.
Rights: fechado
Identifier DOI: 10.1111/nph.13175
Date Issue: 2015
Appears in Collections:Unicamp - Artigos e Outros Documentos

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