Action Spectra of Photomorphogenic Induction and Its Photoinactivation.

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Abstract
The action spectra of induction of photomorphogeneeis of the hypocotyl hook of Black Valentine bean seedlings and its inactivation were determined with interference-filter monochromators at 10 to 20 m[mu] intervals from 365 to 800 m[mu]. It was found that the induction response was proportional to the log of the incident energy over a range of 0.1 to 30 mj/cm2. The action spectrum showed a sharp major peak at 660 m[mu], with evidence of 2 shoulders around 560 and 620 m[mu] and a possible 3d at 700 m[mu]. In the shorter wavelengths, 2 minor peaks appeared around 400 and 500 m[mu]. The inactivation response was a linear function of incident energy up to 85% reversal. The action spectrum for inactivation had 2 major peaks at 710 and 730 m[mu], with a minor one at 640 m[mu]. Evidence is presented that the 710 m[mu] peak is the principal one.