Abstract
Hypocotyls of dark-grown seedlings of Ara bidosis thaliana exhibit a strong negative gravitropism, which is reduced by red and also by long-wavelength, far-red light treatments. Light treatments using phytochrome A (phyA)- and phytochrome B (phyB)-deficient mutants showed that this response is controlled by phyB in a red/far-red reversible way, and by phyA in a non-reversible, very-low-fluence response. Crosses of the previously analyzed phyB-1 allele (in the ecotype Landsberg erecta background) to the ecotype Nossen wild-type (WT) background resulted in a WT-like negative gravitropism in darkness, indicating that the previously described gravitropic randomization observed with phyB-1 in the dark is likely due to a second mutation independent of that in the PHYB gene.
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Abbreviations
- FR:
-
long-wavelength far-red light
- phyA:
-
phytochrome A (holoprotein)
- phyB:
-
phytochrome B (holoprotein)
- Pr:
-
red-absorbing form of phytochrome
- WT:
-
wild type
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We thank Dr. A. Nagatani (RIKEN Institute, Wako-City, Japan) and Dr. M. Furuya (Hitachi, Hatoyama, Japan) for the phyA-201/phyB-5 double mutant. The work was supported by Deutsche Forschungsgemeinschaft and Human Frontier Science Program grants to E.S.
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Poppe, C., Hangarter, R.P., Sharrock, R.A. et al. The light-induced reduction of the gravitropic growth-orientation of seedlings of Arabidopsis thaliana (L.) Heynh. is a photomorphogenic response mediated synergistically by the far-red-absorbing forms of phytochromes A and B. Planta 199, 511–514 (1996). https://doi.org/10.1007/BF00195180
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DOI: https://doi.org/10.1007/BF00195180