Negative Phototropism of Phycomyces in the Ultra-violet

Details Negative Phototropism of Phycomyces in the Ultra-violet Negative Phototropism of Phycomyces in the Ultra-violet

May 1957

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1957natur.179.1028c&link_type=abstract

Nature, Volume 179, Issue 4568, pp. 1028-1029 (1957).

Physics

Optics

5

Scientific paper

IN the course of a study of the growth and curvature of the sporangiophores of Phycomyces, the phototropic sensitivity was re-examined. Preliminary experiments showed that unfiltered green light, isolated from a General Electric H85C3 capillary mercury lamp by a Bausch and Lomb grating monochromator with quartz optics, caused very marked negative curvatures, that is, away from the light source. Addition of a plain glass filter to the system eliminated this response, thus showing that it was due to ultra-violet light of wave-length less than 300 mµ in the second-order spectrum from the monochromator. When sporangiophores were exposed to ultra-violet light of wave-length 280 mµ, negative curvatures began to develop after about 5 min., and after 20-30 min. most of the sporangiophores had curved through at least 90°, pointing directly away from the light source.

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