Ultraviolet-A induced changes in photosystem II of thylakoids: effects of senescence and high growth temperature

Ultraviolet-A (UV-A) radiation induced changes in photosystem II (PS II) of senescing leaves of wheat seedlings were investigated. UV-A radiation did not show any significant effect on the level of photosynthetic pigments. However, the decline in F v/ F m and oxygen evolution rate indicated the dama...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. B, Biology Biology, 2003-05, Vol.70 (2), p.59-65
Main Authors: Nayak, L., Biswal, B., Ramaswamy, N.K., Iyer, R.K., Nair, J.S., Biswal, U.C.
Format: Article
Language:English
Subjects:
Fluorescence
Photosystem II
Photosystem II Protein Complex - chemistry
Photosystem II Protein Complex - radiation effects
Senescence
Temperature
Thermoluminescence
Thylakoids - chemistry
Thylakoids - radiation effects
Triticum - growth & development
Triticum - radiation effects
Ultraviolet Rays
Ultraviolet-A
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Summary:Ultraviolet-A (UV-A) radiation induced changes in photosystem II (PS II) of senescing leaves of wheat seedlings were investigated. UV-A radiation did not show any significant effect on the level of photosynthetic pigments. However, the decline in F v/ F m and oxygen evolution rate indicated the damaging effect of the radiation on primary photochemistry of PS II. Modification at the Q B-binding site was inferred from the observed downshift of peak temperature of thermoluminescence (TL) B-bands. The UV-A induced changes in PS II of chloroplasts from senescing leaves were found to be synergistically accelerated by high growth temperature.
ISSN:1011-1344
1873-2682
DOI:10.1016/S1011-1344(03)00052-6