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Preillumination of lettuce seedlings with red light enhances the resistance of photosynthetic apparatus to UV-A.
Zitatschlüssel Kreslavski2013
Autor Kreslavski, Vladimir D. and Lyubimov, Valery Yu and Shirshikova, Galina N. and Shmarev, Alexander N. and Kosobryukhov, Anatoly A. and Schmitt, Franz-Josef and Friedrich, Thomas and Allakhverdiev, Suleyman I.
Seiten 1–6
Jahr 2013
DOI 10.1016/j.jphotobiol.2013.02.016
Journal J Photochem Photobiol B
Jahrgang 122
Monat may
Institution Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Moscow Region 142290, Russia. vkreslav@rambler.ru
Zusammenfassung Seedlings of 10-day-old lettuce (Lactuca sativa L., cultivar Berlin) were preilluminated by low intensity red light (?max=660 nm, 10 min, 5 ?mol quanta m(-2) s(-1)) and far-red light (?max=730 nm, 10 min, 5 ?mol quanta m(-2) s(-1)) to study the effect of pre-treatment on photosynthesis, photochemical activity of photosystem II (PSII), the contents of photosynthetic and UV-A-absorbing pigments (UAPs) and H2O2, as well as total and ascorbate peroxidase activities in cotyledonary leaves of seedlings exposed to UV-A. UV radiation reduced the photosynthetic rate (Pn), the activity of PSII, and the contents of Chl a and b, carotenoids and UAPs in the leaves, but increased the content of H2O2 and the total peroxidase activity. Preillumination with red light removed these effects of UV. In turn, the illumination with red light, then far-red light removed the effect of the red light. Illumination with red light alone increased the content of UAPs, as well as peroxidase activity. It is suggested that higher resistance of the lettuce photosynthetic apparatus to UV-A radiation is associated with involvement of the active form of phytochrome B, thereby increasing peroxidase activities as well as UAPs and saving preservation of photosynthetic pigment contents due to pre-illumination with red light.
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