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- W1969924740 abstract "Auxin regulates most aspects of flowering-plant growth and development, including key developmental innovations that evolved within the vascular plant lineage after diverging from a bryophyte-like ancestor nearly 500 million years ago [1De Smet I. Jürgens G. Patterning the axis in plants—auxin in control.Curr. Opin. Genet. Dev. 2007; 17: 337-343Crossref PubMed Scopus (98) Google Scholar, 2Friedman W.E. Moore R.C. Purugganan M.D. The evolution of plant development.Am. J. Bot. 2004; 91: 1726-1741Crossref PubMed Scopus (108) Google Scholar, 3Kenrick P. Crane P.R. The origin and early evolution of plants on land.Nature. 1997; 389: 33-39Crossref Scopus (912) Google Scholar]. Recent studies in Arabidopsis indicate that auxin acts by directly binding the TIR1 subunit of the SCFTIR1 ubiquitin ligase; this binding results in degradation of the Aux/IAA transcriptional repressors and de-repression of auxin-responsive genes [4Dharmasiri N. Dharmasiri S. Estelle M. The F-box protein TIR1 is an auxin receptor.Nature. 2005; 435: 441-445Crossref PubMed Scopus (1438) Google Scholar, 5Dharmasiri N. Dharmasiri S. Jones A.M. Estelle M. Auxin action in a cell-free system.Curr. Biol. 2003; 13: 1418-1422Abstract Full Text Full Text PDF PubMed Scopus (130) Google Scholar, 6Dharmasiri N. Dharmasiri S. Weijers D. Lechner E. Yamada M. Hobbie L. Ehrismann J.S. Jürgens G. Estelle M. Plant development is regulated by a family of auxin receptor F box proteins.Dev. Cell. 2005; 9: 109-119Abstract Full Text Full Text PDF PubMed Scopus (712) Google Scholar, 7Kepinski S. Leyser O. Auxin-induced SCFTIR1-Aux/IAA interaction involves stable modification of the SCFTIR1 complex.Proc. Natl. Acad. Sci. USA. 2004; 101: 12381-12386Crossref PubMed Scopus (123) Google Scholar, 8Kepinski S. Leyser O. The Arabidopsis F-box protein TIR1 is an auxin receptor.Nature. 2005; 435: 446-451Crossref PubMed Scopus (1215) Google Scholar, 9Tan X. Calderon-Villalobos L.I. Sharon M. Zheng C. Robinson C.V. Estelle M. Zheng N. Mechanism of auxin perception by the TIR1 ubiquitin ligase.Nature. 2007; 446: 640-645Crossref PubMed Scopus (1000) Google Scholar]. Little is known, however, about the mechanism of auxin action in other plants. To characterize auxin signaling in a nonflowering plant, we utilized the genetically tractable moss Physcomitrella patens. We used a candidate-gene approach to show that previously identified auxin-resistant mutants of P. patens harbor mutations in Aux/IAA genes. Furthermore, we show that the moss Aux/IAA proteins interact with Arabidopsis TIR1 moss homologs called PpAFB and that a reduction in PpAFB levels results in a phenotype similar to that of the auxin-resistant mutants. Our results indicate that the molecular mechanism of auxin perception is conserved in land plants despite vast differences in the role auxin plays in different plant lineages." @default.
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- W1969924740 date "2010-11-01" @default.
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- W1969924740 title "Physcomitrella patens Auxin-Resistant Mutants Affect Conserved Elements of an Auxin-Signaling Pathway" @default.
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- W1969924740 doi "https://doi.org/10.1016/j.cub.2010.08.050" @default.
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