Abstract
THE earliest known physiological response brought about by phytochrome after absorption of red photons is a change in the electrical charge on cell surfaces that causes, in suitable conditions, a fapid attachment of root tips of barley and mung beans to glass charged with phosphates1–4. Far-red irradiation results in detachment of the root tips. I have shown previously that in the presence of greater than 10−8 M indoleacetic acid (IAA), mung bean root tips fail to attach following red irradiation3. This indicates that IAA is able to overcome the influence of phytochrome. I shall show here that in contrast to IAA, abscisic acid (ABA) at very low concentrations causes mung bean root tips to adhere to glass after successive red and far-red irradiation.
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