Effect of light on growth and endogenous hormones in Chlorella minutissima (Trebouxiophyceae)

0429591 - ÚEB 2015 RIV FR eng J - Článek v odborném periodiku
Stirk, W. A. - Balint, P. - Tarkowská, Danuše - Novák, Ondřej - Maroti, G. - Ljung, K. - Turečková, Veronika - Strnad, Miroslav - Ordog, V. - van Staden, J.
Effect of light on growth and endogenous hormones in Chlorella minutissima (Trebouxiophyceae).
Plant Physiology and Biochemistry. Roč. 79, JUN 2014 (2014), s. 66-76. ISSN 0981-9428
Grant CEP: GA ČR GA206/09/1284; GA MŠMT LK21306; GA MŠMT(CZ) LO1204
Grant ostatní: GA MŠk(CZ) ED0007/01/01
Program: ED
Institucionální podpora: RVO:61389030
Klíčová slova: Abscisic acid * Auxins * Brassinosteroids
Kód oboru RIV: EF - Botanika
Impakt faktor: 2.756, rok: 2014

Plant growth regulators (PGRs) play an important role in mediating growth and stress responses in plants. Light influences PGRs concentrations in vascular plants. The effect of light on growth and endogenous PGR concentrations in microalgae was investigated in the present study. Chlorella minutissima MACC 360 was grown in 14:10 h light:dark (L:D), continuous dark (CD) and continuous dark with the addition of 5 g L-1 glucose (CD + G) for 48 h. Cultures were synchronized in the L:D cultures, increasing in size during the light period and dividing during the dark period. C minutissima cells did not increase in size or undergo cell division in CD cultures. In CD + G conditions, the cultures were no longer synchronized but did continue to increase in cell size and constantly underwent cell division although fewer cells divided than in the L:D cultures. Endogenous auxin and cytokinin concentrations increased and gibberellin concentrations decreased over time in the actively growing cultures (L:D and CD + G) but did not increase in the CD cultures. The largest increase in indole content was in the CD + G cultures while the L:D cultures had the largest cytokinin increase. Brassinosteroid concentrations decreased over time in all the cultures including those grown in CD conditions. Abscisic acid (ABA) concentrations were low and only increased in the CD cultures. These results show that endogenous PGRs were affected by the light regime and/or culture growth.
Trvalý link: http://hdl.handle.net/11104/0234677