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Plant and Cell Physiology, 1986, Vol. 27, No. 3 453-461
© 1986

Article

High Temperature Sensitivity of Auxin-induced Ethylene Production in Mung Bean Hypocotyl Sections

Yuko Horiuchi and Hidemasa Imaseki

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

High temperature sensitivities of IAA-induced and 1-aminocyclopropane-1-carboxylic acid (ACC)-dependent ethylene production in etiolated mung bean (Vigna radiata [L] Wilczek) hypocotyl sections were compared at 30,40, 42.5°C. When ethylene production at 30°C was taken as control, IAA-induced production at 40°C was first enhanced and then suppressed after 3 h, whereas ACC-dependent production was enhanced two-fold throughout the 8 h experimental period. However, when hypocotyl sections treated with 1 mM ACC at 30°C for several hours were transferred to 40°C, the ACC-dependent production rate fell below that at 30°C. An initial transient enhancement of IAA-induced ethylene production at 40°C was supported by increased ACC synthase activity and thus by ACC content. At 42.5°C, both IAA-induced and ACC-dependent production were almost completely suppressed. The results indicate that auxin-induced ethylene production is affected by high temperatures in two different steps: a) at 40°C, the auxin action gradually deteriorates although conversion of ACC to ethylene is not affected at all, and at 42.5°C, the conversion is nearly completely suppressed.

(Received July 8, 1985; Accepted January 24, 1986)
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