Partial loss-of-function alleles reveal a role forGNOMin auxin transport-related, post-embryonic development ofArabidopsis
Open Access
- 15 January 2004
- journal article
- Published by The Company of Biologists in Development
- Vol. 131 (2) , 389-400
- https://doi.org/10.1242/dev.00926
Abstract
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.Keywords
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