Effects of Cold Periods on the Stimulus-Response System of Phycomyces

Petzuch , M.; Delbrück , M.

doi:10.1085/jgp.56.3.297

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Article| September 01 1970

Effects of Cold Periods on the Stimulus-Response System of Phycomyces

M. Petzuch,

M. Petzuch

From the Division of Biology, California Institute of Technology, Pasadena, California 91109.

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M. Delbrück

From the Division of Biology, California Institute of Technology, Pasadena, California 91109.

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Author and Article Information

M. Petzuch

From the Division of Biology, California Institute of Technology, Pasadena, California 91109.

M. Delbrück

From the Division of Biology, California Institute of Technology, Pasadena, California 91109.

Dr. Petzuch's present address is Centre National de la Recherche Scientifique, Centre de Générique Moléculaire, 91-Gif-sur-Yvette, France.

Received: March 06 1970

Online ISSN: 1540-7748

Print ISSN: 0022-1295

1970

J Gen Physiol (1970) 56 (3): 297–308.

https://doi.org/10.1085/jgp.56.3.297

The sporangiophores of Phycomyces do not exhibit phototropic responses when growth is arrested reversibly by cooling to 1°C. Unilateral UV stimuli (254 nm) applied during cold periods are stored for at least 2 hr and produce tropic responses away from the light after warm-up. During the cold period dark adaptation proceeds at a rate which decreases with the temperature.

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