On the involvement of acetylcholine in phytochrome action.

In a recent publication Jaffe (1) presented data which implicated acetylcholine as the causative agent in the phytochrome-mediated attachment of mung bean root tips on a glass surface. Since ACh2 is responsible for the bioelectric potential changes in certain nerve cells of animals, proof of its participation in any phytochrome-mediated process is of great significance in elucidating the mechanism of phytochrome action. In this study, attempts have been made to confirm Jaffe's finding that ACh mimics the effect of red light in causing root tips to adhere to glass after far red irradiation.