Acaulospora aspera, a new fungal species in the Glomeromycetes from rhizosphere soils of the inka nut (Plukenetia volubilis L.) in Peru

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Alave, Elizabeth Gaby Colque
Arevalo, Harrison Montejo
Bonilla, Cesar
Calderon, Henri Bailon
Celys, Mary
Coronel, Veronica Olga Yaniro
Duran, Walter Jhon Leiva
Levano, Juan
Lomonte, Bruno
Muyldermans, Serge
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Julius Kühn-Institut
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A new fungal species of the Glomeromycetes, Acaulospora aspera, was isolated from the rhizosphere of the inka nut (Plukenetia volubilis) in San Martin State of Peru (Western Amazonia) and propagated in bait cultures on Sorghum spp., Brachiaria brizantha, Medicago sativa and P. volubilis as host plants. The fungus forms brownish yellow to yellow brown spores, (120-)135-195 x (120-)130-187 mu m in diameter. The surface of the structural spore wall layer is crowded with small depressions, 0.4-0.7 mu m in diameter, up to 0.8 mu m deep, and only 1.1-1.8 apart, giving the spore surface a rough, washboardlike appearance, especially when the outermost, evanescent wall layer has disappeared. Phylogenetically, the new species is close to A. spinosissima, A. excavata and to other morphologically more similar species such as A. spinosa and A. tuberculata, which form spiny or tuberculate projections on the outermost, semi-persistent spore wall layer, or A. herrerae, A. kentinensis, A. scrobiculata and A. minuta, which on the structural spore wall layer all have more pronunced pits than A. aspera. In this study, also the name of A. spinosissima was validated, as it had been preliminary declared invalid because of a typing error in the diagnosis section of its original description.
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rhizosphere soils