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Quantitative assay for algal chemotaxis.

R D Sjoblad, I Chet, R Mitchell

Applied and Environmental Microbiology

|December 1, 1978

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This study shows the unicellular alga Dunaliella tertiolecta is attracted to ammonium ions. Calcium and L-methionine enhance this chemoreception, with optimal attraction at pH 6.25.

Area of Science:

* Marine biology and algal physiology.
* Unicellular algae chemoreception studies.

Background:

* Understanding chemical sensing in unicellular algae is crucial for marine ecology.
* Dunaliella tertiolecta is a common neritic and littoral alga.

Purpose of the Study:

* To quantify the chemoreception of Dunaliella tertiolecta.
* To determine the alga's response to ammonium ions and other chemicals.
* To investigate factors influencing algal attraction to ammonium.

Main Methods:

* Quantitative capillary assay utilizing Lucite chemotaxis plates.
* Measurement of algal cell numbers using a Coulter Counter.
* Testing responses to varying concentrations of ammonium, calcium, and L-methionine.

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Main Results:

* Dunaliella tertiolecta exhibits positive chemotaxis towards ammonium ions, with peak attraction at 10(-3) M.
* Calcium and L-methionine were found to stimulate ammonium-induced chemoreception.
* Algal attraction to ammonium is influenced by incubation time, cell density, and pH, with an optimum at pH 6.25.

Conclusions:

* Ammonium ions are a significant chemoattractant for Dunaliella tertiolecta.
* The chemoreceptive response is modulated by environmental factors and specific chemical stimuli.
* This research provides a quantitative method for studying algal chemoreception.