Analysis of secondary growth in the Arabidopsis shoot reveals a positive role of jasmonate signalling in cambium formation

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

Eva M. Sehr; Javier Agusti; Reinhard Lehner; Edward E. Farmer; Martina Schwarz; Thomas Greb

2010

Scholarcy highlights

  • Secondary or lateral growth is mediated by the activity of the vascular cambium
  • 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
  • We show that the products of COI1, MYC2, JASMONATE-ZIM-DOMAIN PROTEIN 7 and the touchinducible gene JASMONATE-ZIM-DOMAIN PROTEIN 10, which are components of the jasmonic acid 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
  • By identifying the products of the genes JAZ10, JAZ7, MYC2 and COI1 and jasmonic acid itself as regulators of interfascicular cambium initiation and activity, we have identified a connection between JA signalling and secondary growth regulation
  • Our analysis shows that there is an acropetal progression of IC initiation, and that secondary vascular tissue is produced in interfascicular regions of the Arabidopsis shoot
  • The positive effect of jasmonic acid 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

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