[Low radiance in the region of wavelengths 620-660 nm reduces the UV-B-induced damage to photosystem II in spinach leaves].
The effect of monochromatic preirradiation in the region of wavelengths 550-730 nm on the parameters of variable and delayed fluorescence in primary spinach leaves irradiated with UV-B was investigated. It was shown that irradiation of leaves with UV-B at lambda(M) = 300 nm reduced photoinduced changes in variable and delayed fluorescence as well as increased the half rise-time of maximum fluorescence. Preirradiation in the region of 620-660 nm (I = 2-4 W x m(-2)) reduced partly the damage to photosystem II induced by UV-B, whereas preirradiation at lambda(m) = 550, 600, 700, and 730 nm had no significant influence. Potential receptors of red light that take part in the protection of photosystem II against UV-B are discussed.
Kreslavskiĭ
V D
VD
Ivanov
A A
AA
Kosobriukhov
A A
AA
D008027:Light; D045332:Photosystem II Protein Complex / Q000528:radiation effects*; D018515:Plant Leaves / Q000528:radiation effects; D018724:Spinacia oleracea / Q000528:radiation effects*; D014466:Ultraviolet Rays
D045332:Photosystem II Protein Complex