Plant biodiversity and regulation of photosynthesis in the natural environment

摘要: Investigation of photosynthesis regulation in different plant groups exposed to variable conditions showed that all species have similar photosynthetic electron transport modulation while excess energy dissipation is specific. Photosynthesis regulated response dynamic environmental satisfy metabolic demands also avoiding possible over-excitation the chain and generation harmful reactive oxygen species. Photosynthetic organisms evolved several mechanisms modulate light harvesting efficiency respond changing at timescales, going from fast sun flecks slow seasonal variations. These regulatory changed during evolution organisms, adapting various ecological niches, making investigation biodiversity highly valuable uncover conserved traits plasticity complement studies on model In this work, a set plants belonging genera angiosperms, gymnosperms, ferns lycophytes were investigated by monitoring their parameters seasons looking for common trends differences. plants, analysed rate was found be modulated growth intensity, ensuring balance between available photochemical capacity. Growth influenced threshold where heat excitation energy, mechanism called non-photochemical quenching (NPQ), activated. On contrary, NPQ amplitude did not correlate with intensity experienced but species-specific feature. The zeaxanthin-dependent component NPQ, qZ, most its kinetic properties response.