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环境化学  2015 

DOI:10.7524/j.issn.0254-6108.2014.05.009

Keywords: F-,莱茵衣藻,蛋白核小球藻,叶绿素,胞外碳酸酐酶,δ13C

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Abstract:

以莱茵衣藻(Chlamydomonasreinhardtii)和蛋白核小球藻(Chlorellapyrenoidosa)为受试生物,研究了F-对藻叶绿素含量、胞外碳酸酐酶(CAex)活性及稳定碳同位素组成(δ13C)的影响,以探讨F-对微藻的生理效应.结果表明,当F-浓度不超过10mmol·L-1时,随F-浓度增大,蛋白核小球藻叶绿素a、b含量和CAex活性基本不变,而莱茵衣藻叶绿素a、b含量降低,CAex活性小幅增加;当F-浓度在10—200mmol·L-1之间时,随F-浓度的增加,蛋白核小球藻和莱茵衣藻的叶绿素a、b含量均明显下降,CAex活性显著增大,且在F-浓度为100mmol·L-1时达最大,200mmol·L-1时两种藻均不能生存,无CAex活性和叶绿素含量表征.莱茵衣藻对F-具有更灵敏的CAex响应机制,对F-的影响更为敏感,而蛋白核小球藻对F-的耐受性更好;在实验浓度范围内,莱茵衣藻和蛋白核小球藻的δ13C值均随F-浓度的增大呈现出更大的负偏差,F-促使二者优先利用较轻的12C,说明两种微藻光合作用固定无机碳模式发生改变.

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