MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
artículos
Título:
Relationships among soil properties, plant nutrition and arbuscular mycorrhizal fungi-plant symbioses in a temperate grassland along hydrologic, saline and sodic gradients
Autor/es:
GARCÍA ILEANA VANESA; MENDOZA RODOLFO ERNESTO
Revista:
FEMS MICROBIOLOGY ECOLOGY
Editorial:
Blackwell Publishing
Referencias:
Lugar: Oxford; Año: 2008 vol. 63 p. 359 - 371
ISSN:
0168-6496
Resumen:
Temporal variations in the relationships among plant nutrient concentrations, soil
properties and arbuscular-mycorrhizal (AM) fungal dynamics were studied along
a topographic and saline gradient in a temperate grassland soil. Soil and plant
(Lotus tenuis, Paspalum vaginatum, Stenotaphrum secundatum) samples were
collected on four seasonally based occasions. The morphology of AM root
colonization had a similar pattern in the plants studied. Maximum arbuscular
colonization occurred at the beginning of the growing season in late winter and
was minimal in late summer, but maximal vesicular colonization occurred in
summer and was minimal in winter, suggesting a preferential production of these
morphological phases by the fungus with respect to season. The greatest arbuscular
colonization was associated with the highest N and P concentrations in plant
tissue, suggesting a correspondence with increases in the rate of nutrient transfer
between the symbiotic partners. Water content, salinity and sodicity in soil were
positively associated with AM root colonization and arbuscule colonization inLotus tenuis, Paspalum vaginatum, Stenotaphrum secundatum) samples were
collected on four seasonally based occasions. The morphology of AM root
colonization had a similar pattern in the plants studied. Maximum arbuscular
colonization occurred at the beginning of the growing season in late winter and
was minimal in late summer, but maximal vesicular colonization occurred in
summer and was minimal in winter, suggesting a preferential production of these
morphological phases by the fungus with respect to season. The greatest arbuscular
colonization was associated with the highest N and P concentrations in plant
tissue, suggesting a correspondence with increases in the rate of nutrient transfer
between the symbiotic partners. Water content, salinity and sodicity in soil were
positively associated with AM root colonization and arbuscule colonization in
L. tenuis, but negatively so in the grasses. There were distinct seasonally related
effects with respect to both spore density and AM colonization, which were
independent of particular combinations of plant species and soil sites.
independent of particular combinations of plant species and soil sites., but negatively so in the grasses. There were distinct seasonally related
effects with respect to both spore density and AM colonization, which were
independent of particular combinations of plant species and soil sites.
independent of particular combinations of plant species and soil sites.