CHANGES IN ENDOGENOUS CYTOKININ CONCENTRATIONS IN CHLORELLA (CHLOROPHYCEAE) IN RELATION TO LIGHT AND THE CELL CYCLE

0368602 - ÚEB 2012 RIV US eng J - Journal Article
Stirk, W. A. - van Staden, J. - Novák, Ondřej - Doležal, Karel - Strnad, Miroslav - Dobrev, Petre - Sipos, G. - Oerdoeg, V. - Balint, P.
CHANGES IN ENDOGENOUS CYTOKININ CONCENTRATIONS IN CHLORELLA (CHLOROPHYCEAE) IN RELATION TO LIGHT AND THE CELL CYCLE.
Journal of Phycology. Roč. 47, č. 2 (2011), s. 291-301. ISSN 0022-3646. E-ISSN 1529-8817
R&D Projects: GA ČR GA301/08/1649; GA ČR GA206/09/1284
Institutional research plan: CEZ:AV0Z50380511
Keywords : cell cycle * Chlorella * cis-zeatin * cytokinins * N6-(2-isopentenyl)adenine
Subject RIV: EF - Botanics
Impact factor: 2.071, year: 2011

Endogenous cytokinins were quantified in synchronized Chlorella minutissima Fott et Novakova (MACC 361) and Chlorella sp. (MACC 458) grown in a 14:10 light:dark (L:D) photoperiod. In 24 h experiments, cell division occurred during the dark period, and cells increased in size during the light period. Cytokinin profiles were similar in both strains, consisting of five cis-zeatin (cZ) and three N6-(2-isopentenyl)adenine (iP) derivatives. Cytokinin concentrations were low during the dark period and increased during the light period. In 48 h experiments using synchronized C. minutissima (MACC 361), half the cultures were maintained in continuous dark conditions for the second photoperiod. Cell division occurred during both dark periods, and cells increased in size during the light periods. Cultures kept in continuous dark did not increase in size following cell division.
Permanent Link: http://hdl.handle.net/11104/0202900