Action spectrum for the effect of day-extensions on flowering and apex elongation in green,light-grown wheat (Triticum aestivum L.) |
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Authors: | H D Carr-Smith C B Johnson B Thomas |
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Institution: | (1) Department of Botany, Plant Science Laboratories, University of Reading, Whiteknights, P.O. Box 221, RG6 2AS Reading, Berks;(2) A.F.R.C. Institute of Horticultural Research, Worthing Road, BN17 6BD Littlehampton, West Sussex, UK |
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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.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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Keywords: | Action spectrum Light-grown plants Photoperiodism Phytochrome (type I) Triticum (photoperiodism) |
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