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

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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℃. When ethylene production at 30℃ was taken as control, IAA-induced production at 40℃ 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℃ for several hours were transferred to 40℃, the ACC-dependent production rate fell below that at 30℃. An initial transient enhancement of IAA-induced ethylene production at 40℃ was supported by increased ACC synthase activity and thus by ACC content. At 42.5℃, 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℃, the auxin action gradually deteriorates although conversion of ACC to ethylene is not affected at all, and at 42.5℃, the conversion is nearly completely suppressed.
日本植物生理学会の論文