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Alcanivorax bacteria as important polypropylene degraders in mesopelagic environments
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This study is the first clear demonstration that polypropylene (PP) plastic can be biodegraded by bacteria — specifically Alcanivorax species found in deep-sea (mesopelagic) ocean environments. Importantly, the researchers show that PP cannot serve as a sole carbon source for these bacteria, meaning biodegradation requires the presence of other nutrients. This knowledge is foundational for developing realistic PP bioremediation strategies, since PP is one of the most produced and environmentally persistent plastics.
PP biodegradation has not been clearly shown (it has been uncertain whether the PP structure is actually biodegraded or not). This is the first report on the obvious biodegradation of PP. At the same time, this study shows that Alcanivorax bacteria could be major degraders of PP in mesopelagic environments. Moreover, PP biodegradation has been investigated by using solid PP as the sole carbon source. However, this study shows that PP would not be used as a sole carbon and energy source. Our data thus provide very important and key knowledge for PP bioremediation.
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Researchers found that ocean-floating plastics host unique communities of bacteria — called the "plastisphere" — that differ significantly from those in seafloor sediments, with the bacterium Alcanivorax borkumensis shown for the first time to form thick biofilms on low-density polyethylene (LDPE) plastic and begin breaking it down, pointing toward potential biological tools for plastic degradation.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.