INBIOTEC   24408
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y BIOTECNOLOGIA
Unidad Ejecutora - UE
artículos
Título:
Functionality of arbuscular mycorrhizal fungi in three plant communities in Managed Floristic Reserve San Ubaldo-Sabanalamar, Cuba
Autor/es:
FURRAZOLA E; COVACEVICH F; TORRES-ARIAS Y; RODRIGUEZ-RODRIGUEZ RM; LEY-RIVAS JF; IZQUIERDO K; FERNANDEZ VALLE R; BERBARA RLL
Revista:
REVISTA DE BIOLOGíA TROPICAL
Editorial:
REVISTA DE BIOLOGIA TROPICAL
Referencias:
Lugar: San Jose; Año: 2015 vol. 63 p. 341 - 356
ISSN:
0034-7744
Resumen:
In the present study we assessed, during two years, the influence of dry and rainy seasons on the functioning of arbuscular mycorrhizal fungi (AMF) symbionts of native plant from a semi natural savanna (NS), a recovered savanna (RS) from agricultural activity and one agroecosystem (AG) located at the Managed Floristic Reserve San Ubaldo-Sabanalamar, Pinar del Rio, Cuba. Soil samples were collected on April and October (dry and wet periods, respectively) of 2008 and 2010. Four plots inside each ecosystem were selected and five soil sub-samples were taken at random which were combined as a composite sample per plot. The rootlets biomass, arbuscular mycorrhizal colonization (AMC) of host plant in field, density of intraradical mycelium, extraradical mycelium, endophyte biomass and spore density were assessed. The rootlets biomass increased at NS during the dry periods and about 12.85g roots/dm3 of dry soil were recorded. Highest AMC was recorded in all environments, at the wet season for the second year with means ranged from 79% to 89%. Highest values of external mycelium biomass were found for dry season of the second year in all the environments, with a maximum 279mg/dm3 in RS. Density of AMF spores was highest during the dry period of the second year for the three studied ecosystems, with the highest value at the RS with 5 670 spores/100g of dry soil. In general, the effect of rainfall seasonality on the functioning of the AMF was more strongly evident than the ecosystem management. Highest AMC activity was mainly evident during wet periods. Highest rootlet biomass and external mycelia were recorded during dry periods which could indicate strategies of increased the volume of soil explored by AMF as well their host plants. Highest spores density in dry season also allows speculating some strategies of resistance structures production by AMF in situations of water deficit. Our results show the plasticity of mycorrhizal symbiosis to changes in soil water availability