Effect of Salicylhydroxamic Acid on Respiration, Photosynthesis, and Peroxidase Activity in Various Plant Tissues

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Earlier reports from our laboratory described salicylhydroxamic acid (SHAM) stimulation of O_2 uptake by expanded soybean leaves or older green cotyledons. This stimulation could not be interpreted in terms of engagement or capacity of the cytochrome and alternative respiratory pathways. In this report, we tested the possibility that a soluble peroxidase, which can be easily eluted from soybean leaves and cotyledons, might be responsible for SHAM stimulation in whole tissue. The peroxidase catalyzes oxidation of NADH by O_2, is strongly stimulated by SHAM and benzhydroxamic acid (BHAM) and inhibited by KCN, propyl gallate and gentisic acid. This peroxidase, however, does not seem to be responsible for SHAM-stimulated O_2 uptake in whole, green tissue. In our earlier work reporting SHAM-stimulated respiration in green tissue, the samples had not been shielded from room light (10-20 μmol photons・m^<-2>・s^<-1>). In this report, we show that O_2-uptake rates of controls measured in darkness were always greater than those measured in room light. SHAM stimulation was not observed in the dark or in tissue without chlorophyll. We also found that CO_2 uptake of whole leaflets in saturating light was completely inhibited by SHAM fed through the transpiration stream. SHAM, therefore, is a potent inhibitor of photo-synthesis. We conclude that the SHAM-stimulated respiration of green tissues we reported earlier likely was due to very low rates of photosynthesis occurring under room light.
日本植物生理学会の論文

Effect of Salicylhydroxamic Acid on Respiration, Photosynthesis, and Peroxidase Activity in Various Plant Tissues

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