THE EFFECTS OF LOW-DENSITY POLYETHYLENE MICROPLASTICS ON BLUE GREEN ALGA SPIRULINA PLATENSIS
Abstract
Microalgae play a critical role in the food web and biogeochemical cycling and produce compounds that are commercially exploited. However, their reactions and responses to microplastic contamination are not well understood. In this study, the widely distributed and commercially important cyanobacterium, Spirulina (Arthrospira platensis), was exposed to different concentrations (10, 20 and 30 mg/l) of low-density polyethylene microplastics over a 14-days period. Growth rate and photosynthetic activity decreased with increasing microplastic concentration, and an inhibition ratio was calculated from optical density measurements. In addition to, plastic concentrations caused oxidative stress and the intracellular production of SOD enzyme.
The microalga species Spirulina platensis Gomont was cultivated in Zarrouk media enriched with different low density polyethelene (LDPE) concentrations (10, 20, and 30mg/l) to study the effects of LDPE on growth rate, doubling time, chlorophyll, and SOD content.
The (maximum: minimum) range of the growth rate (0.31: 0.18cells/ml), and chlorophyll content (22.55: 19:88mg/l) were recorded in (control (0): 30mg/l) LDPE, respectively. While, the (maximum: minimum) range of the doubling time (18.35: 11.86 days) were recorded in (control(0): 30mg/l) LDPE, respectively. The maximum content of SOD was 15.25 unit/l in 25mg/l of LDPE and the minimum content of it was 14.84 unit/l in control (0mg/l) of LDPE.
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