Roach 2022 Abstract Bioblast
Roach Thomas (2022)
Event: Bioblast 2022
Photosynthetic organisms can tolerate rapid changes in light intensity, which is facilitated by non-photochemical quenching (NPQ) [of chlorophyll fluorescence]. Mechanisms of NPQ include dissipating excess light energy to heat (qE), the reversible attachment of light-harvesting complexes (LHC) to photosystems (state transition / qT) and photoinhibition (qI). Chlorophyll is a ubiquitous pigment of photosynthetic organisms, found in LHC and the reaction centres of photosystem II and I (PSII; PSI). At room temperature, chlorophyll fluorescence is derived predominantly from PSII, and provides insights into PSII efficiency, thus photosynthesis. However, NPQ has a mjor impact on chlorophyll fluorescence intensity. Since NPQ mechanisms can occur simultaneously, they cause complexities in deciphering the signal. The aim of this report is to provide an overview of how various NPQ mechanisms in the model unicellular chlorophyte, Chlamydomonas reinhardtii, as well as environmental conditions, affect chlorophyll fluorescence.
- Department of Botany, University of Innsbruck, Austria