7-11 July 2014
Africa/Johannesburg timezone
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Investigation of the involvement of specific carotenoids in the major plant light harvesting antenna during photoprotection

Presented by Mr. Alexander PARADZAH on 8 Jul 2014 from 11:30 to 11:50
Type: Oral Presentation
Session: Applied
Track: Track F - Applied Physics


Under high irradiation levels, photosynthetic organisms harvest more light than they can utilise in the process of photosynthesis. The excess light is often harmful and has to be dissipated through a process of photoprotection, also known as non-photochemical quenching (NPQ). NPQ is a complex and not well understood process. The pigments responsible for light harvesting consist of carotenoids and chlorophylls. The interaction between these pigments plays an important role in NPQ by producing thermal dissipative channels which compete with the efficient transfer of excitation energy. Energy transfer within light-harvesting antenna complexes can be probed using a technique known as femtosecond pump-probe spectroscopy. In this study the involvement of specific carotenoids in the major component of NPQ has been investigated for the light harvesting complex II (LHC II) of a mutated Arabidopsis species. Mutation of the species was done to control the carotenoids content to thereby have a better understanding of the role of specific carotenoids in NPQ. The main results of the study will be presented.






Dr Tjaart Kruger, University of Pretoria tjaart.kruger@up.ac.za




Room: D Les 103

Primary authors