Abstract
Germination of Rumex obtusifolius L. seeds (nutlets) is low in darkness at 25° C. Germination is stimulated by exposure to 10 min red light (R) and also by a 10-min elevation of temperature to 35° C. A 10-min exposure to far-red light (FR) can reverse the effect of both R (indicating phytochrome control) and 35° C treatment. Fluence-response curves for this reversal of the effect of R and 35° C treatments are quantitatively identical. Treatment for 10 min with light of wavelenght 680, 700, 710 and 730 nm, after R and 35° C treatment, demonstrates that germination induced by 35° C treatment results from increased sensitivity to a pre-existing, active, far-red-absorbing form of phytochrome (Pfr) in the seeds.
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Abbreviations
- FR:
-
far-red light
- P:
-
phytochrome
- Pr:
-
red-absorbing form of P
- Pfr:
-
far-red-absorbing form of P
- R:
-
red light
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Hand, D.J., Craig, G., Takaki, M. et al. Interaction of light and temperature on seed germination of Rumex obtusifolius L.. Planta 156, 457–460 (1982). https://doi.org/10.1007/BF00393317
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DOI: https://doi.org/10.1007/BF00393317