Abstract
Relative quantum responsivity curves for inhibition of hypocotyl elongation in Sinapis alba L. seedlings previously grown in white light confirm that a marked “end of day” inhibition response can be induced by a monochromatic light treatment (30 min) at the end of the light period. In dark grown seedlings, however, no growth inhibition can be induced by a 30 min monochromatic light treatment. A prerequisite for an induction response appears to be a pretreatment with continuous light. Far red light is most effective with blue and red light showing a lesser effectiveness. The light pretreatment also shows a marked fluence rate dependency with respect to its ability to allow an induction response to manifest itself. The pretreatment required shows all the characteristics of a classical “HIR” response. The appearance of the effect in plants treated with the herbicide SAN 9789 seems to exclude chlorophyll as being the photoreceptor.
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Abbreviations
- SAN 9789:
-
4-chloro-5-(methylamino)-2-(α, α, α-trifluoro-m-tolyl)-3(2H)-pyridazinone
- RG9 light:
-
long wavelength far red light (Schott RG9 colour glass)
- FR:
-
far red light
- WL:
-
white light
- BL:
-
blue light
- RL:
-
red light
- D:
-
darkness
- Ptot :
-
total phytochrome
- Pfr :
-
far red absorbing form of phytochrome
- HSR:
-
high irradiance response
References
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Beggs, C.J., Geile, W., Holmes, M.G. et al. High irradiance response promotion of a subsequent light induction response in Sinapis alba L.. Planta 151, 135–140 (1981). https://doi.org/10.1007/BF00387814
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DOI: https://doi.org/10.1007/BF00387814