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Arbuscular mycorrhizal fungi in a mountain grassland II: Seasonal variation of colonization studied, along with its relation to grazing and metabolic host type

     Herbario UNSL, Facultad de Química, Bioquímica y Farmacia, Ejército de los Andes 950, 5700 San Luis, Argentina

Marta N. Cabello ²

     Instituto Spegazzini, Facultad de Ciencias Naturales y Museo, Ave. 53 No. 477, 1900 La Plata, Argentina

The relationships among seasons, host metabolic type, grazing and arbuscular mycorrhizal colonization were analyzed in a high South American native grassland. This study investigated seasonal changes and grazing effects on the symbiotic endomycorrhizal interaction in 5 Poaceae [C₃ metabolic pathway: Briza subaristata Lam., Deyeuxia hieronymi (Hack.) Türpe and Poa stuckertii (Hack.) Parodi; with C₄ metabolic pathway: Eragrostis lugens Nees and Sorghastrum pellitum (Hack.) Parodi; and a Rosaceae (Alchemilla pinnata Ruíz & Pav.)]. All hosts were dominant species in the mountain grassland in central Argentina. It was found that the seasons markedly influenced endomycorrhizal colonization, whereas grazing did not affect this interaction. C₄ grasses presented the highest root colonization. Hosts Briza subaristata (C₃ metabolic pathway) and Sorghastrum pellitum (C₄ metabolic pathway) showed Arum- and Paris-type colonization and intermediate forms.

Key words: AMF, endomycorrhiza, grasses, grazing, mountain grassland, plant metabolic pathway, seasonality

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