Photoprotection by carotenoids of plantago media photosynthetic apparatus in natural conditions

• Authors: Tamara Golovko , Olga Dymova , Ilya Zakhozhiy , Igor Dalke , Galina Tabalenkova
• Languages of publication: EN

Abstracts

EN

The study of daily changes in photosynthetic rate, of energy used in photochemical and non-photochemical processes, and of carotenoid composition aimed at evaluating the role of xanthophyll cycle (XC) in protection of hoary plantain plants (Plantago media) in nature. The leaves of sun plants differed from shade plants in terms of CO2 exchange rate and photosynthetic pigments content. The total pool XC pigments and the conversion state increased from morning to midday in sun plants. An increase in zeaxanthin content occurred concomitantly with the violaxanthin decrease. About 80% violaxanthin was involved in conversion. The maximum of zeaxanthin in XC pigments pool was 60%. The conversion state of XC was twice as lower in shade plants than that in sun plants. The photosynthesis of sun leaves was depressed strongly at midday, but changes of maximum quantum yield of PS2 (Fv/Fm) were not apparent at that time. The coefficient qN (non-photochemical quenching) in the sun leaves changed strongly, from 0.3 to 0.9 as irradiance increased. The direct relation between heat dissipation and the conversion state of XC in plantain leaves was revealed. Thus, plantain leaves were found to be resistant to excess solar radiation due to activation of qN mechanisms associated with the XC de-epoxidation.

Keywords

EN

carotenoids; photoinhibition; photoprotection; Plantago media; xanthophylls cycle

• Journal: Acta Biochimica Polonica
• Year: 2012
• Volume: 59
• Issue: 1
• Pages: 145-147

Dates

published

2012

received

2011-10-17

accepted

2012-03-01

(unknown)

2012-03-17

Contributors

author

Tamara Golovko

• Institute of Biology, Komi Science Centre, Ural Branch of Russian Academy of Sciences, Syktyvkar, Russia

author

Olga Dymova

• Institute of Biology, Komi Science Centre, Ural Branch of Russian Academy of Sciences, Syktyvkar, Russia

author

Ilya Zakhozhiy

• Institute of Biology, Komi Science Centre, Ural Branch of Russian Academy of Sciences, Syktyvkar, Russia

author

Igor Dalke

• Institute of Biology, Komi Science Centre, Ural Branch of Russian Academy of Sciences, Syktyvkar, Russia

author

Galina Tabalenkova

• Institute of Biology, Komi Science Centre, Ural Branch of Russian Academy of Sciences, Syktyvkar, Russia

References

• Demmig-Adams B (2003) Linking the xanthophylls cycle with thermal energy dissipation. Photosynth. Res 76: 73-80.
• Golovko TK, Dalke IV, Zakhozhiy IG, Dymova OV, Tabalenkova GN (2011) Functional plasticity of photosynthetic apparatus and its resistance to photoinhibition in Plantago media. Russ J Plant Physiol 58: 549-559.
• Jahns P, Latowski D, Strzalka K (2009) Mechanism and regulation of the violaxanthin cycle: The role of antenna proteins and membrane lipids. Biochim Biophys Acta 1787: 3-14.