Abstract
Research concerning the influence of auxins and cytokinins on the content of carotenoids in <em>Chlorella pyrenoidosa</em> (<em>Chlorophyceae</em>) has been conducted. The strongest stimulating effect on carotenoids content in <em>Ch. pyrenoidosa</em> biomass was exerted by cytokinins (N-6-benzylaminopurine and N-6-furfurylaminopurine) and allantoin, weaker by auxins and their chemical analogues, and the weakest by tryptamine and 2,4-dichlorophenoxyacetic acid compared to the control. Under the influence of cytokinins the content of α- and β-carotene have been stimulated several times stronger than by auxins, and especially 2,4- dichlorophenoxyacetic acid and tryptamine. However, oxygen-rich xanthophylls content was most strongly reduced by cytokinins (60-70% in relation to the control) in the 20 day lasting of <em>Ch. pyrenoidosa</em> cultivation, similarly to auxins: 1-naphthaleneacetic acid, indole-3-butyric acid, 2,4- dichlorophenoxyacetic acid.
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