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 Bioljournal_title
Developmental biologyauthors
Robinson KR,Miller BJdoi
10.1006/dbio.1997.8600subject
Has Abstractpub_date
1997-07-01 00:00:00pages
125-30issue
1eissn
0012-1606issn
1095-564Xpii
S0012-1606(97)98600-0journal_volume
187pub_type
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journal_title:Developmental biology
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