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KMID : 0368419880310030205
Journal of Plant Biology
1988 Volume.31 No. 3 p.205 ~ p.215
Effect of Simetryne on Chloroplast-Mediated Electron Transport and Photoacoustic Signal
îïúèãÕ/Chun, Hyun Sik
ì°û³ñÁ/àØéÍåÇìé/ÚÓìÒûÛ/ì°òåÛô/Lee, Hae Joo/Sunwoo, Yang il/Park, In Ho/Lee, Chin Bum
Abstract
The effects of simetryne on light induced electron transport and phosphorylation in isolated spinach (Spinacia oleracea L.) chloroplasts were investigated in comparison with sencor and DCMU. Simetryne, like sencor and DCMU, completely, inhibited PS¥± electron transport and phosphorylation with 10^-6 M treatment but did not inhibit PS¥° electron transport. Interference with the electron transport pathway was evidenced by the greater sensitivity of oxygen evolution and uptake than phosphorylation. The following order of decreasing inhibitory effectiveness was exhibited; DCMU>simetryne>sencor.
The photoacoustic technique was also used to monitor the relative photosynthetic activity in the leaves treated with the herbicides (simetryne, sencor or DCMU) in viva and in vitro. Photoacoustic measurements on intact leaves provide quantitative information on two related aspects of the photosynthetic process, namely, photochemical energy storage and oxygen evolution. The relative photoacoustic signal of leaves treated with the herbicides showed low level in 21 Hz, but high level in 380 Hz and on isolated chloroplasts (both 21 Hz and 380 Hz) in comparison with that of the untreated leaves. These results suggest that some of photochemical energy is converted into the heat owing to the inhibition of electron transport pathway by the herbicides.
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