Sundberg, Björn
- Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
Abstract
The molecular mechanisms that control the ordered patterning of vascular tissue development in plants are not well understood. Several models propose a two-component system for vascular differentiation. These components include an inducer of vascular tissue development and an inhibitor that prevents the formation of vascular bundles near pre-existing bundles. We have identified two recessive allelic mutants in Arabidopsis, designated continuous vascular ring (cov1), that display a dramatic increase in vascular tissue development in the stem in place of the interfascicular region that normally separates the vascular bundles. The mutant plants exhibited relatively normal vascular patterning in leaves and cotyledons. Analysis of the interaction of cov1 with a known auxin signalling mutant and direct analysis of auxin concentrations suggests that cov1 affects vascular pattering by some mechanism that is independent of auxin. The COV1 protein is predicted to be an integral membrane protein of unknown function, highly conserved between plants and bacteria. In plants, COV1 is likely to be involved in a mechanism that negatively regulates the differentiation of vascular tissue in the stem
Keywords
Arabidopsis; differentiation; vascular bundle; patterning; auxin
Published in
Development
2003, volume: 130, number: 10, pages: 2139-2148
Publisher: COMPANY OF BIOLOGISTS LTD
SLU Authors
UKÄ Subject classification
Forest Science
Publication identifier
- DOI: https://doi.org/10.1242/dev.00441
Permanent link to this page (URI)
https://res.slu.se/id/publ/1181