The coupling of cyclic GMP and photopolarization of Pelvetia zygotes.

Abstract:

:Unidirectional blue light directs the rhizoid-thallus axis in the apolar zygotes of Fucus and Pelvetia. Here, it is shown that blue light (but not red light) increased cyclic GMP levels of Pelvetia zygotes by about a factor of 2. When the increase in cyclic GMP was blocked by a guanylyl cyclase inhibitor, photopolarization was also blocked. Bathing the cells in a permeant cyclic GMP analog, which should tend to collapse intracellular cyclic GMP gradients, reduced the degree of photopolarization. Growing the cells in the dark in a gradient of the analog caused the rhizoids to tend to form on the low concentration side. It appears that the stimulation of the blue light photoreceptors on the side nearer the light activates guanylyl cyclase and results in a transcytoplasmic cyclic GMP gradient that is necessary for polarization.

journal_name

Dev Biol

journal_title

Developmental biology

authors

Robinson KR,Miller BJ

doi

10.1006/dbio.1997.8600

subject

Has Abstract

pub_date

1997-07-01 00:00:00

pages

125-30

issue

1

eissn

0012-1606

issn

1095-564X

pii

S0012-1606(97)98600-0

journal_volume

187

pub_type

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