Xylanase and cellulase activities during anaerobic decomposition of three aquatic acrophytes

Autor(es)

Maíra F Nunes ^[1] ; Marcela B. da Cunha-Santino ^[2] ; Irineu Bianchini Jr

Afiliação do(s) autor(es)

^[1] Universidade Federal de São Carlos. Programa de Pós-Graduação em Ecologia e Recursos Naturais - Brasil

^[2] Universidade Federal de São Carlos. Departamento de Hidrobiologia - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Journal of Microbiology; v. 42, n. 1, p. 75-83, 2011-03-00.

Resumo

Enzymatic activity during decomposition is extremely important to hydrolyze molecules that are assimilated by microorganisms. During aquatic macrophytes decomposition, enzymes act mainly in the breakdown of lignocellulolytic matrix fibers (i.e. cellulose, hemicellulose and lignin) that encompass the refractory fraction from organic matter. Considering the importance of enzymatic activities role in decomposition processes, this study aimed to describe the temporal changes of xylanase and cellulose activities during anaerobic decomposition of Ricciocarpus natans (freely-floating), Oxycaryum cubense (emergent) and Cabomba furcata (submersed). The aquatic macrophytes were collected in Óleo Lagoon, Luiz Antonio, São Paulo, Brazil and bioassays were accomplished. Decomposition chambers from each species (n = 10) were set up with dried macrophyte fragments and filtered Óleo Lagoon water. The chambers were incubated at 22.5ºC, in the dark and under anaerobic conditions. Enzymatic activities and remaining organic matter were measured periodically during 90 days. The temporal variation of enzymes showed that C. furcata presented the highest decay and the highest maximum enzyme production. Xylanase production was higher than cellulase production for the decomposition of the three aquatic macrophytes species. (AU)

• Processo FAPESP: 07/02683-7 - Decomposição de macrófitas aquáticas: ação enzimática sobre os detritos lignocelulósicos
• Beneficiário: Irineu Bianchini Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Regular