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