Plant Physiol.
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Plant Physiology 66:534-535 (1980)
© 1980 American Society of Plant Biologists

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Short Communication

Phytochrome Modifies Blue-light-induced Electrical Changes in Corn Coleoptiles 1

Richard H. Racusen2 and Arthur W. Galston3

Department of Biology, Yale University, New Haven, Conn. 06520

Unilateral blue light administered to corn coleoptile segments produces no alteration of transmembrane potential on the light side, and only a small and slow hyperpolarization on the dark side. Red light causes a 5-15 millivolt depolarization in cells on the light side causes and somewhat smaller effects on the dark side. Blue given after red causes a rapid hyperpolarization on both sides of the coleoptile. The effect of the potentiating red preirradiation is probably due to phytochrome, being largely abolished by far-red given after red, but before the blue light. The effect of prior red irradiation decays in the dark, showing a half-time of about 45 minutes at room temperature. This rapid cooperativity between phytochrome and the phototropic pigment may indicate a common locale, possibly in a membrane.

2 Present address: Department of Botany, University of Maryland, College Park, Md. 20742.

3 To whom correspondence should be sent.

1 Aided by grant NSG-7290 from the National Aeronautics and Space Administration to AWG.




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Copyright © 1980 by the American Society of Plant Biologists