Abstract
Ultraviolet A (UVA) induced inhibition in photosystem II (PSII) photochemistry of primary leaves of wheat seedlings senescing in light or darkness has been examined. O 2 evolution and 2,6-dichlorophenol indophenol (DCPIP) photoreduction diminished in the presence of light. Results of thermoluminescence (TL) studies suggest that UVA inhibits the activity of PSII by accelerating the process of senescence-induced modifications of Q B protein conformation and/or S-state transitions.
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