2007). The properties of elicitorresponsive photon emissions enhanced by pretreatment with plant defense activators. Jpn. J. Phytopathol. 73: 15-20. Elicitor-responsive photon emissions from rice cells induced with one biotic (N-acetylchitohexaose) and two abiotic (dipotassium hydrogen phosphate, copper chloride) elicitors were characterized. Photon emission caused by each elicitor had its own characteristic pattern, although the changes in both the intensity and the time course differed among

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... he elicitors. The lower the concentration of elicitor, the higher the increase in photon emissions,when acibenzolar-S-methyl, a plant activator, was the pretreatment. Although the degree of enhancement of elicitor-responsive photon emissions induced by each plant activator differed, a priming effect was observed for every combination of elicitor and plant activator except for copper chloride. Therefore, this phenomenon is thought to be common to a certain extent for elicitors. A novel screening method should make use of this phenomenon.