The effects of iron on growth, photosynthesis and biochemical composition of a marine algae <i>Phaeodactylum tricornutum</i>

Zhu Mingyuan; Mu Xueyan; Li Ruixiang; Lu Ruihua

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Zhu Mingyuan, Mu Xueyan, Li Ruixiang, Lu Ruihua. The effects of iron on growth, photosynthesis and biochemical composition of a marine algae Phaeodactylum tricornutum[J]. Haiyang Xuebao, 2000, 22(1): 110-116.

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Zhu Mingyuan, Mu Xueyan, Li Ruixiang, Lu Ruihua. The effects of iron on growth, photosynthesis and biochemical composition of a marine algae Phaeodactylum tricornutum[J]. Haiyang Xuebao, 2000, 22(1): 110-116.

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The effects of iron on growth, photosynthesis and biochemical composition of a marine algae Phaeodactylum tricornutum

Key Laboratory of Marine Science and Numerical Modeling, State Oceanic Administration; First Institute of Oceanography, State Oceanic Administration, Qingdeo 266003

Received Date: 1998-11-09
Rev Recd Date: 1999-07-19

Abstract

Abstract

Iron supply has been proved to influenee phytoplankton biomass,growth rate and species composition as well as primary productivity in both high and low NO₃^- water.The effect of iron on photosynthesis,growth,and biochemical composition of Phaeodactytum tricornutum is studied with laboratory culture.The results show that the algae growth and photosynthetic rate are allotted obviously by the concentration of iron,5×10^-7 mol/dm³ seems to bo the optimum saturated concentration of iron for photosynthesis.The content of biochemical component in Phaeodactylum tricornutum changes under different iron regimes.The increase of chl-a was most significant,ranges from 25% to 35%.Chl-c and carotenoids also increase at degrees less than that of chl-a.Carbohydrates and proteins increase by 5%～10% and 5%～15%,respectively.The activity of cell superoxide dismutase(SOD)and ratio of fluorescence before and after adding DCMU(F_d/F) also increase.Iron has been referred as a factor of limitation in ptimary productivity in the sea.
- Iron,
- growth,
- photosynthesis,
- biochemical composition

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References(20)

References

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