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- W2114925287 abstract "Abstract The presence of indole-3-butyric acid (IBA) as an endogenous auxin in Arabidopsis has been recently demonstrated. However, the in vivo role of IBA remains to be elucidated. We present the characterization of a semi-dominant mutant that is affected in its response to IBA, but shows a wild-type response to indole-3-acetic acid (IAA), the predominant and most studied form of auxin. We have named this mutantrib1 for resistant to IBA. Root elongation assays show that rib1 is specifically resistant to IBA, to the synthetic auxin 2,4-dichlorophenoxyacetic acid, and to auxin transport inhibitors. rib1 does not display increased resistance to IAA, to the synthetic auxin naphthalene acetic acid, or to other classes of plant hormones. rib1individuals also have other root specific phenotypes including a shortened primary root, an increased number of lateral roots, and a more variable response than wild type to a change in gravitational vector. Adult rib1 plants are morphologically indistinguishable from wild-type plants. These phenotypes suggest thatrib1 alters IBA activity in the root, thereby affecting root development and response to environmental stimuli. We propose models in which RIB1 has a function in either IBA transport or response. Our experiments also suggest that IBA does not use the same mechanism to exit cells as does IAA and we propose a model for IBA transport." @default.
- W2114925287 created "2016-06-24" @default.
- W2114925287 creator A5008154919 @default.
- W2114925287 creator A5043535532 @default.
- W2114925287 date "2000-12-01" @default.
- W2114925287 modified "2023-10-02" @default.
- W2114925287 title "The <i>rib1</i> Mutant Is Resistant to Indole-3-Butyric Acid, an Endogenous Auxin in Arabidopsis" @default.
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- W2114925287 doi "https://doi.org/10.1104/pp.124.4.1739" @default.
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