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Plant Physiology 66:615-618 (1980)
© 1980 American Society of Plant Biologists

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Articles

Action Spectra for the Inhibition of Hypocotyl Growth by Continuous Irradiation in Light and Dark-Grown Sinapis alba L. Seedlings 1

Christopher J. Beggs, M. Geoffrey Holmes, Merten Jabben and Eberhard Schäfer

Biologisches Institut II, Universität Freiburg, Schänzlestraße 1, D-7800 Freiburg, West Germany

Action spectra for the inhibition by continuous (24-hour) irradiation of hypocotyl growth in 54-hour-old Sinapis alba L. seedlings were measured using seedlings which had had four different pretreatments. These seedlings were either (a) dark-grown with a high total phytochrome level, (b) dark-grown with a low total phytochrome level, (c) light-grown with chlorophyll, or (d) light-grown with no chlorophyll [treated with 4-chloro-5-(methylamino)-2-({alpha},{alpha},{alpha}-trifluoro-m-tolyl)-3(2H) -pyridazinone (San 9789)].

The resulting action spectra show that the blue, red, and far-red (716 nm) wavebands are most inhibitory for dark-grown plants with high phytochrome content, whereas hypocotyl growth in dark-grown plants with a low phytochrome content are only slightly inhibited by blue and far-red radiation. In light-grown plants, the effectiveness of blue and far-red light almost disappears. The position of red light effectiveness in chlorophyll-containing plants is shifted to lower wavelengths compared with those containing no chlorophyll.

1 This work was supported by the Deutsche Forschungsgemeinschaft (SFB 46) (grant to E.S.), Osram GmbH, München and the Deutsche Akademische Austauschdienst (C.J.B.) M.G.H. was supported by the Deutsche Forschungsgemeinschaft (Biologie der Zeitmessung Wa 263/9). Part of these results were presented at the European Photomorphogenesis Symposium 1979 Antwerpen and are published in "Photoreceptors and Plant Development" edited by J. de Greef.




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