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The Arabidopsis Dwarf Mutant shi Exhibits Reduced Gibberellin Responses Conferred by Overexpression of a New Putative Zinc Finger Protein
Open accessAbstract
shi (for short internodes), a semidominant dwarfing mutation of Arabidopsis caused by a transposon insertion, confers a phenotype typical of mutants defective in the biosynthesis of gibberellin (GA). However, the application of GA does not correct the dwarf phenotype of shi plants, suggesting that shi is defective in the perception of or in the response to GA. In agreement with this observation, the level of active GAs was elevated in shi plants, which is the result expected when feedback control of GA biosynthesis is reduced. Cloning of the SHI gene revealed that in shi, the transposon is inserted into the untranslated leader so that a cauliflower mosaic virus 35S promoter in the transposon reads out toward the SHI open reading frame. This result, together with mRNA analysis, suggests that the phenotype of the shi mutant is a result of overexpression of the SHI open reading frame. The predicted amino acid sequence of SHI has acidic and glutamine-rich stretches and shows sequence similarity over a putative zinc finger region to three presumptive Arabidopsis proteins. This suggests that SHI may act as a negative regulator of GA responses through transcriptional control.
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Citations
Cites
The New RGA Locus Encodes a Negative Regulator of Gibberellin Response in Arabidopsis thaliana
Silverstone, A. L., Mak, P. Y. A., Martinez, E. C., & Sun, T.-P. (1997) · Genetics · doi:10.1093/genetics/146.3.1087 · Cited by 297
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Schmutz, J., Cannon, S. B., Schlueter, J., Ma, J., Mitros, T., Nelson, W., Hyten, D. L., Song, Q., Thelen, J. J., Cheng, J., et al. (2010) · Nature · doi:10.1038/nature08670 · Cited by 4,463
The Arabidopsis SLEEPY1 Gene Encodes a Putative F-Box Subunit of an SCF E3 Ubiquitin Ligase[W]
McGinnis, K. M., Thomas, S. G., Soule, J. D., Strader, L. C., Zale, J. M., Sun, T.-P., & Steber, C. M. (2003) · The Plant Cell · doi:10.1105/tpc.010827 · Cited by 594
Repressing a Repressor: Gibberellin-Induced Rapid Reduction of the RGA Protein in Arabidopsis
Silverstone, A. L., Jung, H.-S., Dill, A., Kawaide, H., Kamiya, Y., & Sun, T.-P. (2001) · The Plant Cell · doi:10.1105/tpc.010047 · Cited by 472
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Wen, C.-K., & Chang, C. (2002) · The Plant Cell · doi:10.1105/tpc.010325 · Cited by 358
Metadata
- Authors
- Fridborg, I., Kuusk, S., Moritz, T., & Sundberg, E.
- Venue
- The Plant Cell
- Publisher
- Oxford University Press (OUP)
- Published
- 1999-06
- Volume
- 11
- Issue
- 6
- Pages
- 1019-1031
- ISSN
- 1040-4651 (ISSN-L)
- 1532-298X
- OpenAlex
- W2171718369
- Cited by
- 172
- References
- 1
- FWCI
- 13.81
- Type
- journal article
- Language
- en
- Open access
- green
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- Fridborg, I., Kuusk, S., Moritz, T., & Sundberg, E. (1999). The Arabidopsis Dwarf Mutant shi Exhibits Reduced Gibberellin Responses Conferred by Overexpression of a New Putative Zinc Finger Protein. The Plant Cell. https://doi.org/10.1105/tpc.11.6.1019
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