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First published online 17 December 2003
doi: 10.1242/dev.00926

Development 131, 389-400 (2004)
Published by The Company of Biologists 2004
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Partial loss-of-function alleles reveal a role for GNOM in auxin transport-related, post-embryonic development of Arabidopsis

Niko Geldner1,*, Sandra Richter1, Anne Vieten1, Sebastian Marquardt1, Ramon A. Torres-Ruiz2, Ulrike Mayer1 and Gerd Jürgens1,{dagger}

1 ZMBP, Entwicklungsgenetik, Universität Tübingen, Auf der Morgenstelle 3, D-72076 Tübingen, Germany
2 Lehrstuhl für Genetik, Technische Universität München, Wissenschaftszentrum Weihenstephan (WZW), Am Hochanger 8, D-85350 Freising, Germany

{dagger} Author for correspondence (e-mail: gerd.juergens{at}zmbp.uni-tuebingen.de)

Accepted 16 October 2003

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.

Key words: GNOM, Guanine-nucleotide exchange factor, Auxin transport, Lateral root formation, Canalisation hypothesis


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