Protective Effect of Putrescine and Spermidine on the Thylakoid Membrane Activity After High Temperature Treatment
Polyamines (PAs) are important factor regulating growth, biosynthesis of protein, RNA, DNA (1–3) as well as stabilizing chloroplast thylakoid membranes and retarding chlorophyll loss (4). Polyamine metabolism change may play a role in plant adaptation to agents inducing biological stress and may serve as a homeostatic buffering mechanism to stabilize cellular pH in stressed plant cells (1,5). Many of the biological functions of PAs appears to be attributed to the cationic nature of these molecules, which are highly protonated at physiological pH (6,7), and their electrostatic interactions with negatively charged functional groups of membranes and enzymatic or structural proteins in the cells (5). Changes in the surface charge density induce considerable conformational alterations and reorganizations of the pigment-protein complexes (8,9) which are sufficient for the heat-induced inactivation of photosynthetic activity (10,11).
KeywordsLeaf Disc Thylakoid Membrane Surface Charge Density Cationic Nature Phospholipid Head Group
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