Phosphorus-Acquisition Strategies of Plant Species ofthe Pampas Biome

• Autores: Michelini, Diego F.; Teste, Francois; Lambers, Hans
• Año de publicación: 2017
• Idioma: inglés
• Tipo de recurso: documento de conferencia
• Materia: PHOSPHORUS; CLUSTER ROOTS; FACILITATION; MYCORRHIZAS
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Phosphorus (P) is found in several chemical compounds in soil, yet it is typically poorly available for plant uptake (Condron et al., 2005).The diversity of P forms in soil may determine “niche differences” in terms of plant P-uptake specializations through resource partitioning (Turner, 2008), promoting the coexistence of plant species (Chesson, 2000). There is scarce information on uptake specialization of different soil P forms by different plant species. Among land plants and ecosystems exists several different plant-P uptake strategies. The relative importance of these different strategies on a community depends on its soil P level, and it changes across communities due to variations of soil P levels (Lambers et al., 2008). Along a wide range of soil P levels plant species associate with mycorrhizal fungi for acquiring P. But in soil with very low levels of total P (<100 mg P kg-1) and available P (<1 mg P kg-1, resin P), the nutrient-uptake strategies of plants are mainly based on the release of exudates to mobilize nutrients; this has been observed along soil P gradients (Hayes et al., 2014, Oliveira et al., 2015). For the Pampas biome, studies are needed to test the relationship between soil P resources and the specializations of plants for acquiring this nutrient, and how different specializations can coexist in environments with P as a severely limiting resource. We hypothesise that in grasslands of the Pampas biome, highly diverse in plants and soils but understudied ecologically, total P and the different soil P forms explain differences in the proportion of plant species with different plant nutrient-acquisition strategies, i.e. 1) arbuscular mycorrhizal species, 2) non-mycorrhizal (NM) organic-acid-exuding species, 3) phosphatase-exuding species: 3a) monoesterase-, 3b) diesterase-, and 3c) phytase-exuding species.
Fil: Michelini, Diego F.. Universidad de la República; Uruguay
Fil: Teste, Francois. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi". Universidad Nacional de San Luis. Facultad de Ciencias Físico, Matemáticas y Naturales. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi"; Argentina
Fil: Lambers, Hans. University of Western Australia; Australia
XVIII International Plant Nutrition Colloquium
Dinamarca
University of Copenhagen