不同Fe^(3+)浓度下赤潮异弯藻对阳光UVR的响应被引量：1

The response of Heterosigma akashiwo grown under different Fe^(3+) concentrations to solar UVR

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摘要探讨了不同Fe3+离子浓度环境下,赤潮异弯藻对阳光紫外辐射(ultraviolet radiation,UVR)的响应.结果发现,在Fe3+限制(5×10-3μmol/L)的情况下,阳光紫外辐射的存在,可以提高赤潮异弯藻的生长速率.而在Fe3+饱和(11.65μmol/L)的情况下,这一现象并不明显.说明Fe3+限制培养的细胞,对UVR的敏感性下降.细胞紫外吸收物质(MAAs)的合成受到Fe3+的调节.生长于Fe3+饱和环境下,接受全阳光辐射,胞内MAAs的含量增加明显,抵抗UVR的能力加强,生长加快.因此,赤潮异弯藻对UVR的响应机制,是受到细胞可利用Fe3+浓度调节的. The response of Heterosigma akashiwo grown in media with different Fe^3＋ concentrations to solar UVR was studied in the present study. The results showed that enhanced growth rate was observed in the ceils exposed to solar UVR under Fe^3＋ -limited condition （5 × 10^-3 umol/L）. But that could not be detected in the cells grown under Fe^3＋ -saturated condition （11.65 umol/L）. These results indicate that Fe^3 ＋ -limitation could lower the sensitivity of Heterosigma akashiwo to solar UVR. Moreover, the synthesis of MAAs was found regulated by intracellular Fe^3＋ concentration. Under Fe^3＋ -saturated condition, solar UVR could increase the content of MAAs, and enhance UVR-resistance, thus faster the cell growth rate. Taken together, our results suggest that the response of Heterosigma akashiwo to solar UVR was regulated by the available Fe^3＋ concentration.

作者关万春

机构地区温州医学院生命科学学院华南师范大学生命科学学院

出处《暨南大学学报（自然科学与医学版）》 CAS CSCD 北大核心 2010年第1期79-83,共5页 Journal of Jinan University(Natural Science & Medicine Edition)

基金华南师范大学博士后启动基金(No.244164) 温州医学院博士启动基金(No.89209008)

关键词赤潮异弯藻三价铁离子紫外辐射 Heterosigma akashiwo Fe^3 ＋ ultraviolet radiation（UVR）

分类号 Q142 [生物学—生态学]

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