Fe3+对铜绿微囊藻生长和光合作用的影响

考察了在0～30000nmol/L浓度范围内，Fe³⁺对铜绿微囊藻（Microcystis aeruginosa）的生长、生化组成和光合作用的影响。结果表明，当Fe³⁺浓度小于10nmol/L时，铜绿微囊藻的生长以及叶绿素和蛋白质的合成均受到明显的限制，Fe³⁺浓度达到30000nmol/L时，其生长受到抑制。富铁条件下藻细胞光饱和的光合作用速率（P_m）、暗呼吸速率（R_d）和表观光合作用效率（α）显著大于缺铁条件，而补偿光强（I_c）及饱和光强（I_k）则低于缺铁条件。结果显示，Fe³⁺是铜绿微囊藻生长的重要限制因子。

Effects of Fe3+ on growth and photosynthesis of microcystis aeruginosa

The effects of Fe³⁺ concentrations changed between 0～30000nmol/L on the growth, biochemical composition and the photosynthesis of microcystis aeruginosa were studied. Ambient levels of physical factors in natural blooms and in BG11 media were used in batch cultures. The results showed that the growth and the biochemical composition (chlorophyll a and protein contents) were limited when Fe³⁺ was below 10nmol/L. When the concentration of Fe³⁺ reached to 30000nmol/L, the growth of this alga was still restained. The chlorophyll aspecific light-saturated photosynthetic rate (P_m), dark respiration rate (R_d) and the apparent photosynthetic efficiency (α) under Fe-replete conditions were significantly higher than those under Fe-limited conditions, whereas the light saturated point (I_k) and the light compensatory point (I_c) showed the contrary. It is evident that the Fe³⁺ deficiency imposed a restriction on the growth and division of microcystis aeruginosa cells.