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Rethy R, Dedonder A, De Petter E, et al. Biphasic fluence-response curves for phytochrome-mediated kalanchoë seed germination : sensitization by gibberellic Acid. Plant Physiol. 1987;83(1):126-30doi: 10.1104/pp.83.1.126.
Rethy, R., Dedonder, A., De Petter, E., Van Wiemeersch, L., Fredericq, H., De Greef, J., Steyaert, H., & Stevens, H. (1987). Biphasic fluence-response curves for phytochrome-mediated kalanchoë seed germination : sensitization by gibberellic Acid. Plant physiology, 83(1), 126-30. https://doi.org/10.1104/pp.83.1.126
Rethy, R, et al. "Biphasic fluence-response curves for phytochrome-mediated kalanchoë seed germination : sensitization by gibberellic Acid." Plant physiology vol. 83,1 (1987): 126-30. doi: https://doi.org/10.1104/pp.83.1.126
Rethy R, Dedonder A, De Petter E, Van Wiemeersch L, Fredericq H, De Greef J, Steyaert H, Stevens H. Biphasic fluence-response curves for phytochrome-mediated kalanchoë seed germination : sensitization by gibberellic Acid. Plant Physiol. 1987 Jan;83(1):126-30. doi: 10.1104/pp.83.1.126. PMID: 16665187; PMCID: PMC1056310.
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Plant Physiol. 1987 Jan;83(1):126-30. doi: 10.1104/pp.83.1.126.

Biphasic fluence-response curves for phytochrome-mediated kalanchoë seed germination : sensitization by gibberellic Acid.

Plant physiology

R Rethy, A Dedonder, E De Petter, L Van Wiemeersch, H Fredericq, J De Greef, H Steyaert, H Stevens

Affiliations

  1. Laboratory of Plant Physiology, State University of Gent, Ledeganckstraat 35, B-9000 Gent, Belgium.

PMID: 16665187 PMCID: PMC1056310 DOI: 10.1104/pp.83.1.126

Abstract

The fluence-response curves for the effect of two red pulses separated by 24 hours on the germination of Kalanchoe blossfeldiana Poelln. cv Vesuv seeds, incubated on gibberellic acid (GA(3)) are biphasic for suboptimal concentrations. The response in the low fluence range corresponds with a classical red/far-red reversible phytochrome mediated reaction. GA(3) induces an additional response in the very low fluence range, which is also phytochrome mediated. The sensitivity to phytochrome-far-red absorbing form (Pfr), however, is increased about 20,000-fold, so that even far-red fluences become saturating. Both in the very low and low fluence response range, the maximal responses induced by saturating fluences are modulated by the GA(3) concentration. GA(3) having no direct influence on the phytochrome phototransformations, alters the Pfr requirement and determines the responding seed population fraction in the very low and low fluence range. The effet of GA(3) appears to be on the transduction chain of the phytochrome signal.

References

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