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PMID:10205161

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Citation

Marchant, A, Kargul, J, May, ST, Muller, P, Delbarre, A, Perrot-Rechenmann, C and Bennett, MJ (1999) AUX1 regulates root gravitropism in Arabidopsis by facilitating auxin uptake within root apical tissues. EMBO J. 18:2066-73

Abstract

Plants employ a specialized transport system composed of separate influx and efflux carriers to mobilize the plant hormone auxin between its site(s) of synthesis and action. Mutations within the permease-like AUX1 protein significantly reduce the rate of carrier-mediated auxin uptake within Arabidopsis roots, conferring an agravitropic phenotype. We are able to bypass the defect within auxin uptake and restore the gravitropic root phenotype of aux1 by growing mutant seedlings in the presence of the membrane-permeable synthetic auxin, 1-naphthaleneacetic acid. We illustrate that AUX1 expression overlaps that previously described for the auxin efflux carrier, AtPIN2, using transgenic lines expressing an AUX1 promoter::uidA (GUS) gene. Finally, we demonstrate that AUX1 regulates gravitropic curvature by acting in unison with the auxin efflux carrier to co-ordinate the localized redistribution of auxin within the Arabidopsis root apex. Our results provide the first example of a developmental role for the auxin influx carrier within higher plants and supply new insight into the molecular basis of gravitropic signalling.

Links

PubMed PMC1171291 Online version:10.1093/emboj/18.8.2066

Keywords

Arabidopsis/metabolism; Arabidopsis/physiology; Arabidopsis Proteins; Biological Transport; Gravitropism; Indoleacetic Acids/metabolism; Phenotype; Plant Proteins/physiology; Plant Roots/metabolism; Plants, Genetically Modified; Signal Transduction

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ARATH:AUX1

GO:0009958: positive gravitropism

ECO:0000269:

P

figure 3 shows that AUX1 restores gravitropic root growth.

complete
CACAO 4348


See also

References

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