Aspects of iron nutrition in macroalgaeUlva pertusa (Chlorophyta) under iron stress

Liu Jing-wen; Dong Shuang-lin; Liu Xiao-yun

doi:10.1007/BF02849654

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Aspects of iron nutrition in macroalgaeUlva pertusa (Chlorophyta) under iron stress

Updated：2023-05-16

- Aspects of iron nutrition in macroalgaeUlva pertusa (Chlorophyta) under iron stress
- Journal of Oceanology and Limnology Vol. 20, Issue 2, Pages: 162-169(2002)
- Affiliations：
  
  Aquaculture Research Laboratory Ocean University of Qingdao
- Author bio：
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- DOI：10.1007/BF02849654
  CLC：
- Published：2002
- Accepted：
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Jing-wen, L., Shuang-lin, D. & Xiao-yun, L. Aspects of iron nutrition in macroalgaeUlva pertusa (Chlorophyta) under iron stress., Chin. J. Ocean. Limnol. 20, 162–169 (2002). https://doi.org/10.1007/BF02849654
DOI：

Jing-wen, L., Shuang-lin, D. & Xiao-yun, L. Aspects of iron nutrition in macroalgaeUlva pertusa (Chlorophyta) under iron stress., Chin. J. Ocean. Limnol. 20, 162–169 (2002). https://doi.org/10.1007/BF02849654 DOI：

摘要

Abstract

Chlorophyll (Chl) and total nitrogen (TN) content in tissues were measured in Fe-deficient cultures ofUlva. pertusa over a period of 60 days. Photosynthetic carbon fixation rates were studied at the start of and 30 days after Fe-deficiency culture

when the effects of Fe-deficiency on the ultrastructure were also analyzed. The iron content in tissue decreased exponentially during Fe-deficiency (from 726.7 to 31.6 μg/gdw) and simultaneously Chl and TN content declined to 4.35% and 59.9% of their original levels respectively. Maximum carbon fixation rate (50–250 μmol/m2 s) under Fe-deficiency decreased significantly compared with the control (p<0.01) and was 13.6 to 0.365 μg C/cm2 h. Photosynthesis in Fe-deficient cells became light-saturated at lower irradiance than that in control. Ultrastructural observations of Fe-deficient cells showed reductions in chloroplast number

some degeneration of lamellar organization

an increase in vacuolar area

a decrease in mitochondrial matrix density

and variation in accumulation body number and morphology. During Fe-deficiency

the algae growth rate continued to decline and after 6 weeks of iron deficiency

no further growth was detectable. These suggested that the lower growth rate ofUlva. pertusa under Fe-deficiency could be due mainly to nitrogen utilization and inhibition of photosynthesis.

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references

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