INMIBO ( EX - PROPLAME)   14614
INSTITUTO DE MICOLOGIA Y BOTANICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Comparative analysis of in vitro decomposition of leaf-litter from the native Celtis tala and the exotic invasive Ligustrum lucidum by selected basidiomicetous fungi
Autor/es:
MALLERMAN, J.; ALARCÓN, E.; HERNÁNDEZ, C.A; SAPARRAT, M.N.; ITRIA, R.F.; LEVIN, L.N.
Lugar:
Florianopolis
Reunión:
Congreso; VIII Congreso Brasilero de Micología; 2016
Institución organizadora:
UFSC-Sociedade Brasileira de Micologia
Resumen:
Invasion of exotic plants in pristine terrestrial ecosystems is a major environmental problem. It generates disturbance and alteration of all the plant community with the consequent harmful impact on the activity of autochthonous organisms associated and their biotic and abiotic relationships. Although the plant-litter is the main resource of energy and matter in several environments such as forests where the substrate quality strongly conditions microbial composition and its related activity in soils, there is scarce data on the effect of the input of senescent leaves from invasive plants on decomposition and humification processes related to microbial activity in soils. Leaf litter consists mainly of polysaccharides cellulose and hemicellulose and the aromatic polymer lignin, the latter being consider as the most recalcitrant. Fungi are the dominant primary decomposers in temperate and boreal forest soil systems and within this group; saprotrophic basidiomycetes are able to degrade all these three litter components through the production of a wide variety of extracellular oxidoreductases and hydrolytic enzymes. Since saprotrophic basidiomicetous fungi play a key role in the degradation of litter components, studies about the comparative abilities of these fungi in decomposition of leaf-litter of both native and exotic invasive plants are necessary to know if the litter quality modifies the activity of these fungi. In this work, litter mass loss and decomposition constants (k) during 200 days in solid state fermentation of the introduced tree Ligustrum lucidum and the native one Celtis tala with selected saprotrophic basidiomycetes were compared. Three fungi were applied: Maramius haematocephalus, Marasmiellus candidus and Leratiomyces ceres which are common litter inhabitants in forest soils where L. lucidum and C. tala coexist. Differences in substrate degradation related to litter type were observed only for L. ceres that achieved a higher k than the exotic L. lucidum. The enhanced degradation of L. lucidum litter might be attributed to the highest Manganese peroxidase activity detected in such substrate. Although no statistical differences in mass loss were observed for the rest of the fungi assayed, we detected changes in the chemical parameters evaluated, related with litter quality and extracellular lignocellulolytic enzyme production.