Biologia plantarum 2012, 56:365-368 | DOI: 10.1007/s10535-012-0100-8

Multiple effects of inhibition of mitochondrial alternative oxidase pathway on photosynthetic apparatus in Rumex K-1 leaves

L.T. Zhang1, H.Y. Gao1,*, Z.S. Zhang1, Z.C. Xue1, Q.W. Meng1
1 State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, P.R. China

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.

Keywords: chlorophyll a fluorescence; high irradiance; JIP-test; photosystem 2
Subjects: high irradiance; JIP-test; chlorophyll fluorescence; irradiance; photosystem; aternative oxidase pathway
Species: Rumex

Received: August 4, 2010; Accepted: March 24, 2011; Published: June 1, 2012Show citation

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Zhang, L.T., Gao, H.Y., Zhang, Z.S., Xue, Z.C., & Meng, Q.W. (2012). Multiple effects of inhibition of mitochondrial alternative oxidase pathway on photosynthetic apparatus in Rumex K-1 leaves. Biologia plantarum, 56(2), 365-368. doi: 10.1007/s10535-012-0100-8.
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