Enhanced chloroplastic generation of H2O2 in stress-resistant Thellungiella salsuginea in comparison to Arabidopsis thaliana.
Bottom Line: In order to find some basis of salinity resistance in the chloroplastic metabolism, a halophytic Thellungiella salsuginea was compared with glycophytic Arabidopsis thaliana.Salinity treatment (0.15 and 0.30 M NaCl for A.t. and T.s., respectively) led to a decrease in ratios of chl a/b and F730 /F685 .In A.t., a salinity-driven enhancement of YII and NPQ was found, in association with the stimulation of H2 O2 production from PQ pool.
Affiliation: Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387, Kraków, Poland.Show MeSH
Mentions: PSII performance in the light-adapted state (YII) was monitored at increasing intensities of actinic light (Fig. 2A). In T.s., YII values were significantly higher than in A.t. (significances start from the light intensity of 23 µmol m−2 s−1). Salinity treatment did not change YII in T.s., whereas, a significant increase was noted in A.t., with exception of the highest light intensity used. However, YII values in salt-treated T.s. were still higher than in salt-treated A.t. (significances were found in the range of light intensities between 23 and 900 µmol m−2 s−1). In the control T.s. plants, values of NPQ were lower than in A.t. in the range of light intensities from 185 to 455 µmol m−2 s−1 (Fig. 2B). A difference in NPQ between these two species became more pronounced after salinity treatment (significances from 185 to 900 µmol m−2 s−1).
Affiliation: Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, 30-387, Kraków, Poland.