Fluoranthene degradation induced morphological and functional changes in Dipodascus ingens biotypes
DOI:
https://doi.org/10.33885/sf.2006.3.965Keywords:
Dipodascus ingens, chitin synthase activity, strains, different phenotypes, flouranthene, polluted sedimentsAbstract
In recent years, bioremediation researches pointed out the increasing yeast populations
associated with industrial discharge, and the occurence of physiological and morphological variations
correlated with the pollution levels. So, the aims of this study were to characterize the yeasts with
aromatic hydrocarbon degradation ability and to report the dimorphic transition, aggregation profiles
and enzyme patterns during fluoranthene (FA) transformation in cultures A
significant variability in cell forms and pseudomycelium development were observed in the isolated
strains; the chitin synthase activity and chitin content confirmed the differences between the biotypes;
moreover, pseudohyphae formation and aggregation profiles were dominant features in the aromatic
hydrocarbon cultures. This study joined the strains in groups, particular traits were found for D1-D3 and
D2-D4 biotypes, and the variability was considered an adaptative response to adverse habitats.
existed in cell and mycelial phases, and this plasticity ensured a better competitiveness in substrate
degradation. Yeast phase dominated in liquid substrates whereas mycelial forms colonized solid ones,
being this trait an advantage to transform toxicants, as most of them remained as particles in the
degradation experiments.
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