InfluÃncia de Cladonia salzmanni Nyl sobre fungos micorrÃzicos arbusculares e no desenvolvimento de plÃntulas de Genipa americana L

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Lichens are know for being rich in substances considered asseing allelopathic or antimicrobial agents, which can be leached out from lichen by rainfall, and therefore the soil below is enriched by these compounds. Aiming to study the ecological role of these organisms, two experiments were performed. In the experiment 1 the effects of Cladonia salzmannii against microbial activity on sandy soils of Savannah-like ecosystem was evaluated. In the experiment 2 the effect of lichen thalli on arbuscular mycorrhizal fungi (FMA) and in the growth Genipa americana seedlings was analyzed. In the field, soils under lichen cover showed lower microbial biomass, CO2 emission and activity of fluorescein diacetate hydrolysis, and heigher mycorrhizal colonization and number of spores than soil without lichen, but was no difference statistical, fact that could be related to the barbatic acid low concentrations. The experiment in greenhouse was in a factorial randomized design of 4 treatments (control, lichen, lichen+FMA and FMA) and 5 replicates. After 4 months the plants were analyzed with regard to the growth, stem diameter, dry biomass shoot, dry biomass root, number of spores and mycorrhizal colonization also was assessed presence of barbatic acid in soil. The growth parameters did not differ significantly among the treatments. The seedlings with lichen+FMA presented the highest dry and fresh of the biomass both shoot and root. The presence of lowest concentrations of barbatic acid in the soil was observed, although the lichen treatment had highest concentrations of this acid than lichen+FMA treatment

ASSUNTO(S)

alelopatia arbuscular mycorrhizal fungi allelopathy bioquimica fungos micorrÃzicos arbusculares Ãcido barbÃtico cladonia salzmannii cladonia salzmannii barbatic acid

ACESSO AO ARTIGO

Documentos Relacionados