Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 85:1146-1150 (1987)
© 1987 American Society of Plant Biologists

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Membranes and Bioenergetics

Wavelength Effect on the Action of a N-Phenylimide S-23142 and a Diphenylether Acifluorfen-Ethyl in Cotyledons of Cucumber (Cucumis sativus L.) Seedlings 1

Ryo Sato, Eiki Nagano, Hiromichi Oshio, Katsuzo Kamoshita and Masaki Furuya2

Sumitomo Chemical Company Ltd., Takarazuka Research Center, Pesticides Research Laboratory, 2-1, 4-chome Takatsukasa, Takarazuka, Hyogo 665, Japan, Division of Biological Regulation, National Institute for Basic Biology, Okazaki, Aichi 444, Japan

Specific wavelengths of light required for expression of phytotoxic activity of S-23142 (N-[4-chloro-2-fluoro-5-propargyloxy]phenyl-3,4,5,6-tetra- hydrophthalimide) and acifluorfen-ethyl (ethyl-5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitro benzoic acid) were determined in cotyledons of cucumber seedlings using the Okazaki Large Spectrograph. Leakage of amino acids from the cotyledons was measured as an indication of the phytotoxic activity. The wavelength effects showed common major peaks of activity at 550 and 650 nanometers and a minor peak at 450 nanometers for both herbicides, indicating a common primary photoreaction. Concomitant application of DCMU (3-[3,4-dichlorophenyl]-1,1-dimethylurea) with S-23142 had little influence on the effective wavelengths for S-23142 activity. Light of 450 and 650 nanometers was relatively less effective in achlorophyllous tissue grown in far red light than in green tissue. These results strongly suggest that the phytotoxic action of S-23142 and diphenylethers involves multiple photoreactions and that one of the photoreceptor pigments may be chlorophyll or its related pigment, although photosynthesis is not involved.

2 Present address: Frontier Research Programs, Riken Institute, Wako, Saitama 351-01, Japan.

1 This study was carried out under the NIBB Cooperative Research Program for the Okazaki Large Spectrograph (86-503).






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