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Action spectra for changes in the “high irradiance reaction” in hypocotyls ofSinapis albaL.

✍ Scribed by M. G. Holmes; E. Schäfer

Publisher
Springer-Verlag
Year
1981
Tongue
English
Weight
573 KB
Volume
153
Category
Article
ISSN
0032-0935

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✦ Synopsis

Detailed action spectra are presented for the inhibition of hypocotyl extension in dark-grown Sinapis alba L. seedlings by continuous (24 h) narrow waveband monochromatic light between 336 nm and 783 nm. The results show four distinct wavebands of major inhibitory action; these are centred in the ultra-violet (λmax=367 nm), blue (λmax=446 nm), red (λmax=653 nm) and far-red (λmax=712 nm) wavebands. Previous irradiation of the plants with red light (which also decreases Ptot) causes decreased inhibitory action by all wavelengths except those responsible for the red light inhibitory response. Pre-irradiation did not alter the wavelength of the action maxima. It is concluded that ultra-violet and blue light act mainly on a photoreceptor which is different from phytochrome.

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