Cookies on this website
We use cookies to ensure that we give you the best experience on our website. If you click 'Continue' we'll assume that you are happy to receive all cookies and you won't see this message again. Click 'Find out more' for information on how to change your cookie settings.

After primary growth, most dicotyledonous plants undergo secondary growth. Secondary growth involves an increase in the diameter of shoots and roots through formation of secondary vascular tissue. A hallmark of secondary growth initiation in shoots of dicotyledonous plants is the initiation of meristematic activity between primary vascular bundles, i.e. in the interfascicular regions. This results in establishment of a cylindrical meristem, namely the vascular cambium. Surprisingly, despite its major implications for plant growth and the accumulation of biomass, the molecular regulation of secondary growth is only poorly understood. Here, we combine histological, molecular and genetic approaches to characterize interfascicular cambium initiation in the Arabidopsis thaliana inflorescence shoot. Using genome-wide transcriptional profiling, we show that stress-related and touch-inducible genes are up-regulated in stem regions where secondary growth takes place. Furthermore, we show that the products of COI1, MYC2, JAZ7 and the touch-inducible gene JAZ10, which are components of the JA signalling pathway, are cambium regulators. The positive effect of JA application on cambium activity confirmed a stimulatory role of JA in secondary growth, and suggests that JA signalling triggers cell divisions in this particular context.

Original publication

DOI

10.1111/j.1365-313X.2010.04283.x

Type

Journal article

Journal

Plant J

Publication Date

09/2010

Volume

63

Pages

811 - 822

Keywords

Arabidopsis, Arabidopsis Proteins, Basic Helix-Loop-Helix Leucine Zipper Transcription Factors, Cambium, Cell Division, Cyclopentanes, Gene Expression Profiling, Gene Expression Regulation, Developmental, Gene Expression Regulation, Plant, Meristem, Nuclear Proteins, Oligonucleotide Array Sequence Analysis, Oxylipins, Plant Growth Regulators, Plant Roots, Repressor Proteins, Reverse Transcriptase Polymerase Chain Reaction