title: Identification of genes expressed in vascular tissues using NPA-induced vascular overgrowth in Arabidopsis.
abstract: The genetic basis of vascular differentiation and function is relatively poorly understood, partly due to the difficulty of screening for mutants defective in internal vascular tissues. Here we present an approach based on a predicted increase in vascular-related gene expression in response to an auxin transport inhibitor-induced vascular overgrowth. We used microarray analyses to identify 336 genes that were up-regulated > or =2-fold in shoot tissues of Arabidopsis thaliana showing vascular overgrowth. Promoter-marker gene fusions revealed that 38 out of 40 genes with > or =4-fold up-regulation in vascular overgrowth tissues had vascular-related expression in transgenic Arabidopsis plants. Obtained expression patterns included cambial tissues and differentiating xylem, phloem and fibers. A total of 15 genes were found to have vascular-specific expression patterns in the leaves and/or inflorescence stems. This study provides empirical evidence of the efficiency of the approach and describes for the first time the in situ expression patterns of the majority of the assessed genes.
authors.affiliation: Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada. V5A 1S6.
authors.forename: Carol L
authors.initials: CL
authors.lastname: Wenzel
authors.forename: Qian
authors.initials: Q
authors.lastname: Hester
authors.forename: Jim
authors.initials: J
authors.lastname: Mattsson
mesh_terms: D017360:Arabidopsis / Q000187:drug effects* / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism; D035264:Flowers / Q000166:cytology / Q000378:metabolism; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant / Q000187:drug effects*; D010797:Phthalimides / Q000494:pharmacology*; D018515:Plant Leaves / Q000166:cytology / Q000378:metabolism; D040081:Protein Array Analysis; D015854:Up-Regulation
chemical_list: D029681:Arabidopsis Proteins; D010797:Phthalimides; C002687:alpha-naphthylphthalamic acid