Disentangling the photochemical salinity tolerance in Aster tripolium L.: connecting biophysical traits with changes in fatty acid composition

• DOI: 10.1111/plb.12517
• Publication Date: 2016-10-17T09:25:48Z
• Authors: B. Duarte; M. T. Cabrita; C. Gameiro; A. R. Matos; R. Godinho; J. C. Marques; I. Caçador
• Keywords: 0303 health sciences; Light; Photosystem I Protein Complex; Fatty Acids; Aster Plant; Photosystem II Protein Complex; Salt-Tolerant Plants; Salt Tolerance; Darkness; Sodium Chloride; Photochemical Processes; Adaptation, Physiological; 03 medical and health sciences; Phenotype; halophyte; saline; fatty acid; photobiology; Photosynthesis; agriculture

Abstract A profound analysis of A. tripolium photochemical traits under salinity exposure is lacking in the literature, with very few references focusing on its fatty acid profile role photophysiology. To address this, deep processes were evaluated by Pulse Amplitude Modulated (PAM) Fluorometry coupled a discrimination leaf profile. Plants exposed to 125–250 m NaCl showed higher light harvesting efficiencies and lower energy dissipation rates. exposure, there evident damage oxygen evolving complexes (OECs). On other hand, Reaction Centre (RC) closure net rate density increased, improving fluxes entering PS II, spite high amounts dissipated loss II antennae connectivity. Energy was mainly achieved through auroxanthin pathway. Total content displayed similar trend, being also levels omega‐3 omega‐6 acids. The increase oleic palmitic allows maintenance good functioning II. Also relevant concentration chloroplastic C16:1t individuals subjected NaCl, related electron transport activity organization Light Harvesting Complexes (LHC) thus reducing activation mechanisms. All these new insights shed some not only photophysiology this potential cash‐crop, but highlight important saline agriculture applications species as forage source essential