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Action spectra for the inhibition of growth in radish hypocotyls

✍ Scribed by Ann M. Jose; Daphne Vince-Prue

Publisher
Springer-Verlag
Year
1977
Tongue
English
Weight
317 KB
Volume
136
Category
Article
ISSN
0032-0935

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✦ Synopsis

In etiolated seedlings of Raphanus sativus L. the inhibition of hypocotyl elongation by continuous light showed a major bimodal peak of action in the red and far-red, and two minor peaks in the blue regions of the spectrum. It is argued that, under conditions of prolonged irradiation, phytochrome is the pigment controlling the inhibition of hypocotyl elongation by red and far-red light, but that its mode of action in far-red is different from that in red. A distinct pigment is postulated for blue light.

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