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Related Experiment Videos

Allelopathic effect of Acorus tatarinowii upon algae.

C Q He1, C K Wang

  • 1Department of Environmental Science & Engineering, Shanghai University, Shanghai 200072, China. hecq@China.com

Journal of Environmental Sciences (China)
|November 29, 2001
PubMed
Summary

Acorus tatarinowii root secretions exhibit allelopathic effects on algae, inhibiting their growth. Low concentrations may promote algae, but higher concentrations are inhibitory.

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Area of Science:

  • Plant Biology
  • Ecology
  • Biochemistry

Background:

  • Algae compete with aquatic plants for resources like light and nutrients.
  • Acorus tatarinowii, also known as Chinese sweet flag, is an aquatic plant.

Purpose of the Study:

  • To investigate the allelopathic effects of Acorus tatarinowii root secretions on algae.
  • To determine the concentration-dependent effects of these secretions on algal growth and physiology.

Main Methods:

  • Treatment of algae with Acorus tatarinowii root secretions ('A. tatarinowii water').
  • Measurement of chlorophyll a destruction, photosynthetic rates, and triphenyltetrazolium chloride (TTC) deoxidization ability.
  • Microscopic observation of algal cell morphology.
  • Testing varying concentrations of root secretions for inhibitory effects.

Main Results:

  • A. tatarinowii secretions damaged chlorophyll a and reduced algal photosynthetic rates.
  • Algal cells showed reduced TTC deoxidization and morphological changes.
  • Allelopathic effects were concentration-dependent, with inhibition occurring above a threshold of 30-45 microliters/disc.
  • Low concentrations of secretions promoted algal growth, while higher concentrations inhibited it.

Conclusions:

  • Acorus tatarinowii possesses significant allelopathic properties against algae.
  • Planting Acorus tatarinowii can be an effective strategy for controlling green algae growth.
  • The allelopathic effect is mediated by a concentration-dependent mechanism, with a critical threshold for inhibition.

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