Abstract

IAA induced a diurnal change in floral response to chilling of Lemna gibba G3 under continuous light, as has been reported for ACh. This IAA effect was antagonized by an antiauxin, T-CA. NAA and 2,4-D had no influence on the temperature sensitivity of the duckweed. ACh-like reagents were examined with respect to the sensitivity to their antagonists. Atropine, an ACh-specific antagonist, inhibited the action of IAA. The IAA treatment, however, decreased the ACh content of the plant by ca. 30%. Thus, IAA and ACh are surmised to attack the same or similar action site(s) independently.

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