INVESTIGADORES
OYARZABAL Mariano
artículos
Título:
Screening of biomass production of cultivated forage grasses in response to mycorrhizal symbiosis under nutritional deficit conditions
Autor/es:
ROMINA CAVAGNARO; MARIANO OYARZABAL; MARTÍN OESTERHELD; AGUSTÍN GRIMOLDI
Revista:
Grassland Science
Editorial:
Japanese Society of Grassland Science
Referencias:
Año: 2014 vol. 60 p. 178 - 184
ISSN:
1744-6961
Resumen:
Arbuscular mycorrhizal fungi (AMF) colonize the root systems of most natural
grassland species and usually increase plant growth by enhancing nutrients provision.
This effect on growth responses of cultivated forage grasses is scarcely
known, particularly under nutritional deficit conditions. We examined total
biomass production, aboveground and belowground biomass and tillering of
three temperate and three tropical cultivated forage grasses. Seedlings of each
species were inoculated with a mixture of mycorrhizal fungi and later grown
for 5 months under nutritional deficit conditions. The mycorrhizal symbiosis
promoted aboveground and belowground biomass production in five out of
six grass species. Grass species differed in their mycorrhizal responsiveness:
tropical grasses (Panicum coloratum cv. Klein = Brachiaria brizantha cv. Marand
u > Paspalum dilatatum cv. Primo) responded better than temperate (Festuca
arundinacea cv. Royal > Agropyron elongatum cv. Hulk), while the
temperate Dactylis glomerata cv. Porto did not respond to AMF inoculation. In
four of the species, the changes observed in aboveground biomass were
explained by the total number of tillers, while, in P. dilatatum, changes were
accounted for by the individual weight of mature tillers. On the whole, the
screening of cultivated forage grasses revealed that tropical grasses were highly
responsive to mycorrhizae, in contrast to a lower effect on the growth of temperate
grasses.