Abstract
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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Abbreviations
- B:
-
blue
- D:
-
dark
- FR:
-
far-red
- HIR:
-
high irradiance reaction
- HW:
-
half power bandwith
- Pr:
-
R absorbing form of phytochrome
- Pfr:
-
FR absorbing form of phytochrome
- Ptot:
-
total phytochrome=Pr+Pfr
- R:
-
red
- UV:
-
ultra violet
References
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Holmes, M.G., Schäfer, E. Action spectra for changes in the “high irradiance reaction” in hypocotyls of Sinapis alba L.. Planta 153, 267–272 (1981). https://doi.org/10.1007/BF00383898
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DOI: https://doi.org/10.1007/BF00383898