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Plant and Cell Physiology, 1973, Vol. 14, No. 5 881-892
© 1973

Article

Properties of the proteinaceous inhibitor of ethylene synthesis: Action on ethylene production and indoleacetylaspartate formation

Shingo Sakai and Hidemasa Imaseki

Research Institute for Biochemical Regulation, Faculty of Agriculture, Nagoya University Nagoya 464, Japan

Several properties of the proteinaceous inhibitor of ethylene biosynthesis are described. The inhibitor reversibly inhibited ethylene production by auxin-treated hypocotyl segments of etiolated mungbean seedlings. It also inhibited endogenous ethylene formation. Fluorescence microscopy of tissue treated with the inhibitor labeled with a fluorescent dye, FITC, revealed that the action of the inhibitor only on epidermal cells was enough to achieve inhibition. The site of auxin-induced ethylene production was assumed to be the epidermis. The inhibitor inhibits neither respiration of hypocotyl segments nor auxin-induced elongation growth of wheat coleoptiles. Relative levels of free IAA in tissue were not altered by the inhibitor, but IA-Asp formation was reversively suppressed.

A possible interrelation between ethylene production and IA-Asp formation is discussed

(Received March 30, 1973; )
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