Multiple effects of inhibition of mitochondrial alternative oxidase pathway on photosynthetic apparatus in Rumex K-1 leaves
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The effects of inhibition of mitochondrial alternative oxidase (AOX) respiratory pathway on photosynthetic apparatus in Rumex K-1 leaves were studied. Under high irradiance, the inhibition of AOX pathway caused over-reduction of photosystem (PS) 2 acceptor side, a decrease in the energy transfer in the PS 2 units, damage of donor side of PS 2 and decrease in pool size of electron acceptors. The inhibition of AOX pathway also decreased photosynthetic performance index (PIABS), actual photochemical efficiency (ΦPS2), photochemical quenching (qP) and photosynthetic O2 evolution rate. The results demonstrate that mitochondrial AOX pathway plays a vital role in photoprotection of photosynthetic apparatus.
Additional key wordschlorophyll a fluorescence high irradiance JIP-test photosystem 2
- Q A
primary quinone electron acceptor of PS 2
reactive oxygen species
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We are grateful to the State Key Basic Research and Development Plan of China (2009CB118500) and China National Nature Science Foundation (No. 30671451; No. 30571125) for their financial support of this study.
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