Differential photosynthetic performance and photoprotection mechanisms of three Mediterranean evergreen oaks under severe drought stress

Functional Plant Biology : FPB
José Javier Peguero-PinaEustaquio Gil-Pelegrín

Abstract

The ability of three Mediterranean oaks (Quercus coccifera L., Quercus ilex ssp. ballota (Desf.) Samp and Quercus suber L.) to cope with intense drought was investigated. Water stress reduced stomatal conductance and photosynthesis in these species. Drought-mediated changes in photosynthetic-related parameters allowed the characterisation of the specific photo-protective mechanisms. Specifically, Q. suber downregulated photosynthetic electron transport rates (ETR) closing PSII reaction centres (i.e. decreasing photochemical quenching) and through an antheraxanthin (A) + zeaxanthin (Z)-mediated diminished intrinsic PSII efficiency (Φexc.). These changes were lower in Q. coccifera and Q. ilex ssp. ballota, which decreased further ETR photo-inactivating PSII centres (evidenced by their low predawn Fv/Fm ratios at high water stress). The predawn Fv/Fm ratio decreased in Q. coccifera largely due to Fm decreases, whereas in Q. ilex ssp. ballota Fv/Fm decreases were due to F0 increases, below -4 MPa. These Fv/Fm decreases were well correlated with increases in the A + Z photo-protective pigments. An analysis of dark respiration and photorespiration as alternative electron sinks under intense drought stress also revealed interspecific ...Continue Reading

References

Jan 1, 1993·Plant Physiology·E. E. Pfundel, R. A. Dilley
Mar 12, 2004·Annual Review of Plant Physiology and Plant Molecular Biology·Krishna K. Niyogi
Apr 12, 2005·The New Phytologist·Christopher TraiserVolker Mosbrugger
Sep 2, 2006·The New Phytologist·Barbara Demmig-Adams, William W Adams
Sep 1, 1990·Photosynthesis Research·O van Kooten, J F Snel
Jun 1, 2004·The New Phytologist·Tim J Brodribb, N Michele Holbrook

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Citations

Oct 7, 2017·Physiologia Plantarum·Jesús Rodríguez-CalcerradaLuis Gil
Jun 3, 2021·Proceedings of the National Academy of Sciences of the United States of America·Rachid CheddadiEnno Schefuß
Oct 4, 2013·Journal of Proteome Research·José Valero-GalvánJesús V Jorrín-Novo

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