田琳, 李祥蕾. 氧苯酮对龙须菜(Gracilaria lemaneiformis)光合作用和呼吸作用的影响[J]. 海洋环境科学, 2021, 40(5): 760-765. DOI: 10.12111/j.mes.20210042
引用本文: 田琳, 李祥蕾. 氧苯酮对龙须菜(Gracilaria lemaneiformis)光合作用和呼吸作用的影响[J]. 海洋环境科学, 2021, 40(5): 760-765. DOI: 10.12111/j.mes.20210042
TIAN Lin, LI Xiang-lei. Effect of oxybenzone on the photosynthesis and respiration of Gracilaria lemaneiformis[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2021, 40(5): 760-765. DOI: 10.12111/j.mes.20210042
Citation: TIAN Lin, LI Xiang-lei. Effect of oxybenzone on the photosynthesis and respiration of Gracilaria lemaneiformis[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2021, 40(5): 760-765. DOI: 10.12111/j.mes.20210042

氧苯酮对龙须菜(Gracilaria lemaneiformis)光合作用和呼吸作用的影响

Effect of oxybenzone on the photosynthesis and respiration of Gracilaria lemaneiformis

  • 摘要: 本文以野生龙须菜(Gracilaria lemaneiformis)为受试材料,测定氧苯酮(BP-3)胁迫下龙须菜的快速叶绿素荧光、光合放氧/呼吸耗氧速率及活性氧含量的变化,研究了不同浓度的氧苯酮对龙须菜光合作用和呼吸作用的影响,分析了氧苯酮对水生植物的伤害机理。结果表明,用5~30 µmol/L的BP-3在黑暗条件下处理30 h后,龙须菜的呼吸作用不受影响,但光合作用PSII受体侧电子传递受到明显抑制。在80 µmol/(m2·s)光下,5~30 µmol/L 的BP-3可导致光合作用光能吸收与利用的失衡并诱发活性氧的大量产生,且抑制作用随胁迫浓度升高而加剧。活性氧测定结果进一步显示,光下BP-3诱导的氧化胁迫加剧了龙须菜光合作用PSII受体侧的破坏,并进一步损伤其呼吸作用过程和光合作用PSII供体侧。

     

    Abstract: The effect of oxybenzone (BP-3) on the photosynthesis and respiration of wild Gracilaria lemaneiformis was investigated by determining the response of the rapid chlorophyll fluorescence, photosynthetic oxygen evolution rate, respiratory oxygen uptake rate, and active oxygen content in this alga exposed to 0 to 30 µmol/L of this reagent. Results showed that 5~30 mol/L BP-3 had a slight effect on respiration after 30 hours treatment without light, but could directly inhibit the electron transfer of PSII receptor side of photosynthesis in G. lemaneiformis. At 80 μmol/m2/s light, BP-3 caused an imbalance of photosynthetic light energy absorption and utilization, and further induced the over-production of reactive oxygen species. The inhibition was intensified with the increase of BP-3 concentration. The oxidative stress induced by BP-3 would aggravate the damage of PSII receptor side of photosynthesis, and further damage the respiration process and photosynthetic PSII donor side in the seaweed.

     

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