Photomovement of two species of Dunaliella Teod. (Chlorophyta): [preprint]
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Date
2012-08-29T14:02:07Z
Authors
Posudin, Yuriy
Massjuk, Nadiya
Lilitskaya, Galyna
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Abstract
This review is focused on photomovement of two species of green alga Dunaliella Teod., D.salina Teod. and D. viridis Teod., as the principal organisms investigated. Problems in terminology and a logical basis for classification of photomovement in microorganisms are discussed. The results of experimental investigations on the critical factors controlling and modulating photomovement are described and include the effects of various abiotic factors, critical aspects of hotomovement such as photoreception (i.e., location and structure of photoreceptor systems, composition of photoreceptor pigments, mechanisms of photoreception and photoorientation), sensory transduction of absorbed light into signals that govern the activity of the motor apparatus and flagellar activity. Various aspects involved in the utilization of the species as models for studying photomovement, such as testing aquatic media and the effects of urface-active substances, salts of heavy metals and pesticides on algal photomovement parameters are described. Vector methods for testing are proposed for assessing the action of various chemicals. Likewise, the potential of using the two species as organisms for transgenic alteration, such as enhanced production of s-carotene, ascorbic and dehydroascorbic acids, glycerin and other valuable organic compounds are described. The main tendencies and perspectives for further photomovement investigations in flagellates are discussed.