Negative feedback regulation is responsible for the non-linear modulation of photosynthetic activity in plants and cyanobacteria exposed to a dynamic light environment

0170746 - UEK-B 20033053 RIV NL eng J - Journal Article
Nedbal, Ladislav - Březina, Vítězslav - Adamec, František - Štys, Dalibor - Oja, V. - Laisk, A. - Govindjee, A.
Negative feedback regulation is responsible for the non-linear modulation of photosynthetic activity in plants and cyanobacteria exposed to a dynamic light environment.
Biochimica Et Biophysica Acta-Bioenergetics. Roč. 1607, č. 1607 (2003), s. 5-17. ISSN 0005-2728. E-ISSN 1879-2650
R&D Projects: GA MŠMT LN00A141
Institutional research plan: CEZ:MSM 123100001; CEZ:AV0Z6087904
Keywords : Calvin-Benson Cycle * Forced oscilation * Intermittent light
Subject RIV: EI - Biotechnology ; Bionics
Impact factor: 4.431, year: 2003

Photosynthetic organisms exposed to a dynamic light environment exhibit complex transients of photosynthetic activities that are strongly dependent on the temporal pattern of the incident irradiance. In a harmonically modulated light of intensity I approximate to const. + sin(omegat), chlorophyll fluorescence response consists of a steady-state component, a component modulated with the angular frequency of the irradiance omega and several upper harmonic components (2omega, 3omega and higher). Our earlier reverse engineering analysis suggests that the non-linear response can be caused by a negative feedback regulation of photosynthesis. Here, we present experimental evidence that the negative feedback regulation of the energetic coupling between phycobilisome and Photosystem II (PSII) in the cyanobacterium, Synechocystis sp. PCC6803 indeed results in the appearance of upper harmonic modes in the chlorophyll fluorescence emission.
Permanent Link: http://hdl.handle.net/11104/0067828