Abstract
Fluence-rate response curves for wavelengths from 640 nm to 730 nm were constructed for the day-extension promotion of flowering in green, light-grown, wheat (Triticum aestivum L., cv. Alexandria), a long-day plant. The resultant action spectrum had action maxima at 660 nm and 716 nm and resembles spectra for the high-irradiance reaction (HIR) seen in etiolated plants. Because, the HIR is thought to be controlled by type I pytochrome (that which is most abundant in etiolated tissue) our results indicate the involvement of type I phytochrome in the photomorphogenesis of a light-grown, green plant.
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Abbreviations
- Pr:
-
red-light-absorbing form of phytochrome
- Pfr:
-
far-red-light-absorbing form of phytochrome
- Ptot:
-
total phytochrome level (Pr+Pfr)
- HIR:
-
high-irradiance reaction
- SDP:
-
short-day plant(s)
- LDP:
-
long-day plant(s)
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Carr-Smith, H.D., Johnson, C.B. & Thomas, B. Action spectrum for the effect of day-extensions on flowering and apex elongation in green, light-grown wheat (Triticum aestivum L.). Planta 179, 428–432 (1989). https://doi.org/10.1007/BF00397581
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DOI: https://doi.org/10.1007/BF00397581