Fe3+对浮游颤藻生长和光合作用的影响
EFFECTS OF Fe3+ON GROWTH AND PHOTOSYNTHESIS OF OSCILLATORIA PLANCTONICA
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摘要: 考察了浓度为0-30mmol/L的范围内,Fe3+对浮游颤藻(Oscillatoria planctonicaWoloszynska)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,浮游颤藻的生长以及叶绿素和蛋白质的合成均受到明显的抑制,对其补铁后这种抑制能够得到一定程度的缓解。当Fe3+浓度达到10mmol/L时,最大生物量与比生长速率分别是不加铁时的3倍和4倍。富铁条件下藻细胞光饱和的光合作用速率(Pm)、暗呼吸速率(Rd)和表观光合作用效率(α)显著大于缺铁条件,而光补偿点Ic及饱和光强Ik则低于缺铁条件。结果显示,铁是浮游颤藻生长的重要限制因子。Abstract: Fe was suspected as a limitingfactor controlling phytoplankton abundance in certain areas of the open ocean1Some experiments have been run to examine growth limitation of oceanic and coastal species as a function of Fe3+concentrations.Few studies are conducted corresponding the effect of Fe3 +concentrations on algae in lake.Oscillatoria planctonica Woloszynska,a bloom-forming cyanobacterium,was grown in Fe-deficient and Fe-replete batch cultures using ambient levels of physical factors in natural blooms and in BG11 media1The characteristics of growth,biochemical composition and photosynthesis of Oscillatoria planctonica under Fe3+concentrations between 0-30 mmol/L were covered in this paper.The results showed that the growth and biochemical composition(chlorophyll a and protein contents)were limited when Fe3 +was below10 nmol/L and were alleviated by the addition of Fe3+.When the Fe3+concentration reached 10 mmol/L,the final yields and specific growth rate were 3 and 4 times respectively compared with those under zero added Fe3+condition1Chlorophyll aspecific light-saturated photosynthetic rate(Pm),dark respiration rate(Rd) and apparent photosynthetic efficiency(α) under Fe-replete conditions were significantly higher than those under Fe-limited conditions,whereas light saturated point(Ik)and light compensatory point(Ic) showed the contrary.It is evident that Fe deficiency imposed a restriction on the growth and division of Oscillatoria planctonica cells
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Keywords:
- Oscillatoriaplanctonica /
- Fe3+ /
- Growth /
- Photosynthesis
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