| 摘要: |
| 研究了赤潮异弯藻(Heterosigma akashiwo)在不同浓度的Fe(NH4)2(SO4)2·6H2O(Fe1)和FeSO2·7H2O(Fe2)(浓度分别为:高铁150 nmol/L、低铁50 nmol/L,缺铁0 nmol/L Fe0)中的种群消长过程、单位细胞总多糖特征、光合色素chla、chlc变化以及NO3--N的吸收情况。结果表明,Fe2+浓度影响到赤潮异弯藻的消亡:缺铁组比高铁组种群消亡慢。在平台期和衰亡期时,Fe1各组单位细胞总多糖含量均明显高于Fe2各组。从平台期到衰亡期,各组单位细胞多糖含量明显增加,Fe2各组增量最大,Fe1各组多糖倍增与Fe0相似。亚铁离子浓度的进一步增加有利于单位细胞色素chla和chlc的积累。亚铁离子的不同化合物状态影响到多糖和光合色素的累积,但不影响种群生长率和对NO3--N的吸收。 |
| 关键词: 亚铁离子 赤潮异弯藻(Heterosigma akashiwo) 种群消长 多糖 光合色素 |
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| 基金项目:国家自然科学基金项目( 20472040) ; 教育部高等学校科技创新工程重大项目培育资金项目( 705028) ; 浙江省自然科学基金资助项目( Y504083) |
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| Population dynamics and some biochemical changes in Heterosigma akashiwo affected by ferrous ion |
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| Abstract: |
| The effects of ferrous ion on ichthyotoxic red tide organism Heterosigma akashiwo were studied. Two ferrous ion forms, Fe(NH4)2(SO4)(Fe1) and FeSO4(Fe2), were added to the culture under three different concentrations(high group, 150 nmol/L; low group, 50 nmol/L, naught group, 0 nmol/L), changes of population, polysaccharide, chlorophyll a and c and nitrate level in culture medium were investigated. The results indicated that ferrous concentration affects the population crash, a ferrous deficient group(Fe0) can maintain a longer life and a higher density than the higher iron groups during the population crash. The cellular polysaccharide content in Fe1 group is significantly higher than that in Fe2 group both at stationary phase and crash phase. From stationary phase to crash phase, the polysaccharide content in each group increased, the highest increase appeared in Fe2. Increase of ferrous ion is helpful to the accumulation of chlorophylls. The different formations of ferrous ion affect the accumulations of polysaccharide and chlorophylls but have no obvious effects on the population growth rate and nitrate level. |
| Key words: Ferrous ion Heterosigma akashiwo population dynamics polysaccharides chlorophylls |
