The Journal of General Physiology
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The Journal of General Physiology, Vol 84, 845-859, Copyright © 1984 by The Rockefeller University Press

ARTICLES

The gravireceptor of Phycomyces. Its development following gravity exposure

DS Dennison and W Shropshire Jr

The gravitropism of a mature stage IV Phycomyces sporangiophore has a shorter and more uniform latency if the sporangiophore is exposed horizontally to gravity during its earlier development (stage II and stage III). This early exposure to an altered gravitational orientation causes the sporangiophore to develop a gravireceptor as it matures to stage IV and resumes elongation. A technique has been developed to observe the spatial relationship between the vacuole and the protoplasm of a living sporangiophore and to show the reorganization caused by this exposure to altered gravity. Possible gravireceptor mechanisms are discussed.
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