cot1: A regulator of Arabidopsis trichome initiation

Daniel B. Szymanski, Daniel A. Klis, John C. Larkin, M. David Marks

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


In Arabidopsis, the timing and spatial arrangement of trichome initiation is tightly regulated and requires the activity of the GLABROUSI (GL1) gene. The COTYLEDON TRICHOME 1 (COT1) gene affects trichome initiation during late stages of leaf development and is described in this article. In the wild-type background, cot1 has no observable effect on trichome initiation. GL1 overexpression in wild-type plants leads to a modest number of ectopic trichomes and to a decrease in trichome number on the adaxial leaf surface. The cot1 mutation enhances GL1-overexpression-dependent ectopic trichome formation and also induces increased leaf trichome initiation. The expressivity of the cot1 phenotype is sensitive to cot1 and 35S: GL1 gene dosage, and the most severe phenotypes are observed when cot1 and 35S:GL1 are homozygous. The COT1 locus is located on chromosome 2 15.3 cM north of er. Analysis of the interaction between cot1, lry, and 35S:GL1 suggests that COT1 is part of a complex signal transduction pathway that regulates GL1-dependent adoption of the trichome cell fate.

Original languageEnglish (US)
Pages (from-to)565-577
Number of pages13
Issue number2
StatePublished - Jun 1 1998


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