Abstract
The effects of NaCl salinity and Abscisic acid pretreatment on the polypeptide composition, photochemical activity and kinetic characteristics of oxygen evolving reactions in isolated thylakoids from barley ( Hordeum vulgare L., var. Alfa ) seedlings were studied. It was shown that thylakoids isolated from plants previously subjected to a prolonged NaCl treatment were more resistant to high concentration of NaCl after in vitro incubation. Pretreatment with ABA 3 days before salinization diminished the inhibitory effect of the NaCl. Both ABA and NaCl treatment lead to an increase in the internal ABA level in the plant leaves. ABA seems to play a specific role in this adaptive process, promoting some structural changes in the chloroplast membranes, which in turn reflect on the oxygen evolving mechanisms. The obtained results are discussed in terms of an effect of salinity and ABA treatment leading to an increased participation of the stroma situated photosystem II centers, possessing higher resistance to damaging factors.
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