吐纳麝香对东海原甲藻的毒性作用机制

Prorocentrum donghaiense was selected to study the toxic mechanism of tonalide (AHTN) on marine microalgae. Five concentrations (1, 10, 50, 200 and 400μg/L) of AHTN were tested to evaluate its influence on the growth, photosynthetic pigment content, cell morphology and structure, cell membrane permeability and the antioxidant and photosynthetic systems. The results showed that AHTN significantly inhibited the growth of P. donghaiense with high toxicity (96h-EC₅₀ = 48.21μg/L). The mechanism of realization of the algal toxicity of AHTN is the inhibition of photosynthetic pigment production, the destruction of cell structure and cell membrane integrity, the induction of antioxidant system response, and the effect of photosynthe performance. However, treatment with 1μg/L AHTN treatment promoted the growth of P. donghaiense. Meanwhile, treatment with 1μg/L and 10μg/L AHTN promoted the synthesis of photosynthetic pigments and increased the activity of superoxide dismutase as well as some photosynthetic parameters. In conclusion, low concentrations of AHTN (1μg/L) may induce red tides of P. donghaiense, while high concentrations of AHTN (10~400μg/L) could inhibit the population growth of this algae and cause a potential threat to marine ecosystems.