Hydrobiological Bulletin

, Volume 14, Issue 3, pp 152–157 | Cite as

Physiology of some submersed aquatic angiosperms: effects of heavy metals

  • Sasadhar Jana
  • Monojit A. Choudhuri
Article

Summary

  1. 1.

    Potamogeton showed the highest rates of dark respiration, net photosynthesis, photorespiration, and Hill activity, and the highest chlorophyll a:b ratio, and the lowest photosynthesis:photorespiration ratio.Hydrilla showed the lowest dark respiration, photorespiration and chlorophyll a:b ratio, and the highest apparent photosynthesis and photosynthesis: photorespiration ratio.Vallisneria was intermediate in this respect.

     
  2. 2.

    Induced aging lowered the Hill activity, the rates of net and apparent photosynthesis, and the photorespiration, and increased the dark respiration and the photosynthesis: photorespiration ratio in all the three species. The chlorophyll a:b ratio increased inHydrilla but decreased in the other two species during aging.

     
  3. 3.

    All the heavy metal compounds lowered the dark respiration, the Hill activity, and the net and apparent photosynthesis in all the three species exceptPotamogeton where Cu increased the dark respiration. All the metals always increased the photosynthesis: photorespiration ratio. The chlorophyll a:b ratio was increased inHydrilla and lowered in the other two species. The effects of metals on the photorespiration were variable.

     
  4. 4.

    Treatments of heavy metal compounds in different combinations produced more or less similar effects on the physiological parameters as were obtained when applied alone

     

Keywords

Heavy Metal Chlorophyll Physiological Parameter Metal Compound Dark Respiration 

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Copyright information

© Netherlands Hydrobiological Society 1980

Authors and Affiliations

  • Sasadhar Jana
    • 1
  • Monojit A. Choudhuri
    • 1
  1. 1.Plant Physiology and Biochemistry Laboratory, Botany DepartmentBurdwan UniversityBurdwanIndia

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