Two-dimensional imaging of ultraweak emissions from intact bean sprouts and soybean roots was achieved by a photon counting imager with ultrahigh sensitivity. As an new application of a use of ultraweak luminescence, we have studied plant-fungus interactions to reveal the nature of the defense responses. Ultraweak luminescence generated by sweet potato and nonpathogenic Fusarium oxysporum interactions associated with a defense response was detected by a photon counting method using ultrahigh-sensitive photodetectors. The time-dependent intensity variation, the spectrum and the two-dimensional imaging of the ultraweak luminescence are indicative of the defense response of the sweet potato to F. oxysporum. The production of ipomeamarone as a phytoalexin means that F. oxysporum induced the defense response in the sweet potato.
KeywordsDefense Response Sweet Potato Fusarium Oxysporum Photon Counting Soybean Root
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