Biodegradation of glyphosate by wild yeasts
DOI:
https://doi.org/10.33885/sf.2004.3.924Keywords:
Candida krusei, Yarrowia lipolytica, environmental technologies, glyphosate degradation, CN P sourcesAbstract
Glifosate detoxification by wild yeasts were studied from colonies isolated of treated
and non treated soils with the herbicide. Seventy seven yeast colonies were obtained from
treated soils and 38 from non treated samples, being Candida kruseis and Yarrowia lipolytica the
dominant species in each group, respectively. Y. lipolytica showed a longer lag phase and
degradation began 6 days from incubation, while in C. kruseis after 3 days from incubation with
a higher total uptake of the herbicide (66 vs. 42.5%). Both species were cultivated in enriched
media with phosphate, gliphosate or aminomethylphosphonic acid (AMPA) in order to obtain
active strains cultivated on substrates with organophosphonates as C and P sources. Enriched
cultures increased the mycelial density of the yeasts, although the phosphate presence
inhibited the gliphosate breakdown. The presence of mycoflora adapted to degrade glyphosate
and its metabolites was confirmed, therefore wild yeasts could be significant in natural
detoxification processes, specially in the bioremediation of agricultural areas polluted with
organophosphonates.
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