Mineral nutrition of campos rupestres plant species on contrasting nutrient-impoverished soil types

Autor(es)

Oliveira, Rafael S. ^{[1, 2]} ; Galvao, Hugo C. ^[2] ; de Campos, Mariana C. R. ^[1] ; Eller, Cleiton B. ^[2] ; Pearse, Stuart J. ^[1] ; Lambers, Hans ^[1]

Afiliação do(s) autor(es)

^[1] Univ Western Australia, Sch Plant Biol, Perth, WA 6009 - Australia

^[2] Univ Estadual Campinas, Dept Biol Vegetal, BR-13083862 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NEW PHYTOLOGIST; v. 205, n. 3, p. 1183-1194, FEB 2015.
• Citações Web of Science: 50

Resumo

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. (AU)

• Processo FAPESP: 10/17204-0 - Mudanças climáticas em montanhas brasileiras: respostas funcionais de plantas nativas de campos rupestres e campos de altitude a secas extremas
• Beneficiário: Rafael Silva Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/19555-2 - Dinâmica de uso de água e balanço de carbono de espécies lenhosas de matas nebulares
• Beneficiário: Cleiton Breder Eller
• Modalidade de apoio: Bolsas no Brasil - Doutorado