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Development ePress online publication date 17 Dec 2003
doi: 10.1242/dev.00926

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Research article

Partial loss-of-function alleles reveal a role for GNOM in auxin transport-related, post-embryonic development of Arabidopsis


Niko Geldner, Sandra Richter, Anne Vieten, Sebastian Marquardt, Ramon A. Torres-Ruiz, Ulrike Mayer, and Gerd Jürgens*
* Author for correspondence (e-mail: gerd.juergens{at}zmbp.uni-tuebingen.de)

The Arabidopsis GNOM gene encodes an ARF GDP/GTP exchange factor involved in embryonic axis formation and polar localisation of the auxin efflux regulator PIN1. To examine whether GNOM also plays a role in post-embryonic development and to clarify its involvement in auxin transport, we have characterised newly isolated weak gnom alleles as well as trans-heterozygotes of complementing strong alleles. These genotypes form a phenotypic series of GNOM activity in post-embryonic development, with auxin-related defects, especially in the maintenance of primary root meristem activity and in the initiation and organisation of lateral root primordia. Our results suggest a model for GNOM action mediating auxin transport in both embryogenesis and post-embryonic organ development.
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