Journal
CHINESE SCIENCE BULLETIN
Volume 52, Issue 13, Pages 1742-1745Publisher
SCIENCE PRESS
DOI: 10.1007/s11434-007-0275-0
Keywords
DEG proteases; D1 protein; degradation; PSII reaction center; Arabidopsis thaliana
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Deg5, deg8 and the double mutant, deg5deg8 of Arabidopsis thaliana were used to study the physiological role of the DEG proteases in the repair cycle of photosystem II (PSII) under heat stress. PSII activity in deg mutants showed increased sensitivity to heat stress, and the extent of this effect was greater in the double mutant, deg5deg8, than in the single mutants, deg5 and deg8. Degradation of the D1 protein was slower in the mutants than in the WT plants. Furthermore, the levels of other PSII reaction center proteins tested remained relatively stable in the mutant and WT plants following high-temperature treatment. Thus, our results indicate that DEG5 and DEG8 may have synergistic function in degradation of D1 protein under heat stress.
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