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铁对中肋骨条藻生长、色素化程度及氮同化能力的影响

, PP. 50-56

Keywords: 中肋骨条藻,,生化组成,氮同化能力,色素化

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Abstract:

以中肋骨条藻为对象,研究了铁以及铁与氮的交互作用对藻类生长、色素化程度及氮同化能力的影响.结果表明,在3×108~5×10-6mol/dm3浓度范围内,随着Fe的增加,该藻对氮的吸收量增加,同化能力增大,细胞色素化程度降低,胞内氨基酸(AA)和蛋白质(Pr)含量升高,细胞生长加快,细胞生长率在Fe浓度为5×10-6mol/dm3时达最大.叶绿素a和褐色素以及胞内AA和Pr与铁浓度的对数呈正相关关系.实验还发现,当N/P为20:1时(比较40:1和10:1),铁与氮交互作用对细胞生长、色素化程度以及氮同化能力影响尤其显着:当Fe浓度一定时,不同形态的氮源对藻胞内AA转化为Pr速率的影响是低氧化态氮源高于高氧化态氮源.

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