The co-existence between DSE and AMF symbionts affects plant P pools through P mineralization and solubilization processes

DELLA MÓNICA, IVANA FLORENCIA; SAPARRAT, MARIO ; GODEAS, ALICIA MARGARITA; SCERVINO, JOSÉ MARTÍN

FUNGAL ECOLOGY

ELSEVIER SCI LTD

Lugar: Amsterdam; Año: 2015 vol. 17 p. 10 - 17

1754-5048

The capacity of dark septate endophytes (DSE; Phialocephala turiciensis, Acephala applanata, P.glacialis and Phaeomollisia piceae) to solubilize inorganic phosphate (P) and to mineralize theorganic form was studied. We analysed the effect of DSE strains on P uptake by Trifoliumrepens in the presence or absence of arbuscular mycorrhizal fungi (AMF). Phosphataseswere observed both in the absence of the host plant and the organic resource, showing thatthe P mineralization process is not induced by the enzyme substrate or the host. DSE weremore efficient at mineralizing organic P. Independently of the presence of AMF, DSEincreased the pool of P in the soil, with significant differences being found in P levelsamong the different DSE. In contrast, plant P uptake was increased by AMF. The P contentof plants increased with the co-inoculation of AMF and P. turiciensis or P. piceae. Wehypothesize a close relationship between DSE and AMF in relation to P availability anduptake in plants. Whereas DSE increase the pool of P in the rhizosphere, AMF areresponsible for P transfer to the host, with co-colonization of plants by DSE and AMFshowing a synergistic outcome.