7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

The role of low-energy fluorescence bands in the photoprotection of the major plant light harvesting complex.

8 Jul 2014, 11:10
D Les 103

D Les 103

Oral Presentation Track F - Applied Physics Applied


Mr Herman Stoltz (University of Pretoria)

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Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

Most photosynthetic organisms are designed to function optimally in low light conditions. However the typical daily incident irradiation is higher than the energy that a plant requires. Therefore it can lead to lethal consequences for the organism if the amount of light energy absorbed is not regulated efficiently. This regulation of the light energy is a major function of the light harvesting complexes in the Photosystem II (PSII) of the plants, a process known as non-photochemical quenching (NPQ). NPQ has been strongly linked to large, rapid intensity variations in the fluorescence; known as fluorescence intermittency or blinking. A major component of the thermal dissipation process, known a qE, is characterised by the appearance of low energy absorption and fluorescence bands. By mimicking the in vivo qE states of the major light harvesting complexes (LHCII) the protein dynamics under qE conditions can be monitored via changes in the absorption and fluorescent spectra. By using single molecule spectroscopy (SMS) it is possible to study a single antenna complex at a time in order to understand the molecular dynamics involved with qE. In this presentation the relationship between the fluorescence blinking and the low energy fluorescence bands (redshifts) is investigated.

Main supervisor (name and email)<br>and his / her institution

T.P.J. Kruger, tjaart.kruger@up.ac.za, University of Pretoria

Primary author

Mr Herman Stoltz (University of Pretoria)


Mr Joshua Botha (University of Pretoria) Mr Michael Gruber (Vrije University Amsterdam) Prof. Rienk Van Grondelle (Vrije University Amsterdam) Dr Tjaart Krüger (University of Pretoria)

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