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.
| Original language | English |
|---|---|
| Journal | Development (Cambridge, England) |
| Volume | 131 |
| Issue number | 2 |
| Pages (from-to) | 389-400 |
| Number of pages | 12 |
| ISSN | 0950-1991 |
| DOIs | |
| Publication status | Published - Jan 2004 |
Keywords
- Alleles
- Arabidopsis
- Arabidopsis Proteins
- Biological Transport, Active
- Gene Expression Regulation, Developmental
- Gene Expression Regulation, Plant
- Genes, Plant
- Gravitropism
- Guanine Nucleotide Exchange Factors
- Indoleacetic Acids
- Meristem
- Models, Biological
- Mutation
- Phenotype
- Plant Growth Regulators
- Plant Roots
- Journal Article
- Research Support, Non-U.S. Gov't