Effect of Common Bean Seedling Pretreatment with Chlorocholine Chloride on Photosystem II Tolerance to UV-B Radiation, Phytohormone Content, and Hydrogen Peroxide Content

In true leaves of common bean (Phaseolus vulgaris L., cv. Berbukskaya) 11-day-old seedlings, pre-treatment with 1.6 mM chlorocholine chloride (CCC) resulted in the improved photosystem II (PSII) tolerance to UV-B radiation, an increase in the contents of cytokinins, ABA, and H2O2, but a decrease in the content of gibberellins. It is suggested that development of increased PSII tolerance to UV-B under the influence of CCC is partially related to the increase in the contents of ABA, cytokinins, and UV-absorbing pigments in the leaves of pretreated plants.