Journal of Plant Research

, 123:25 | Cite as

Weeds of change: Cardamine hirsuta as a new model system for studying dissected leaf development

  • Claudia Canales
  • Michalis Barkoulas
  • Carla Galinha
  • Miltos Tsiantis
JPR Symposium

Abstract

Cardamine hirsuta, a small crucifer closely related to the model organism Arabidopsis thaliana, offers high genetic tractability and has emerged as a powerful system for studying the genetic basis for diversification of plant form. Contrary to A. thaliana, which has simple leaves, C. hirsuta produces dissected leaves divided into individual units called leaflets. Leaflet formation requires activity of Class I KNOTTED1-like homeodomain (KNOX) proteins, which also promote function of the shoot apical meristem (SAM). In C. hirsuta, KNOX genes are expressed in the leaves whereas in A. thaliana their expression is confined to the SAM, and differences in expression arise through cis-regulatory divergence of KNOX regulation. KNOX activity in C. hirsuta leaves delays the transition from proliferative growth to differentiation thus facilitating the generation of lateral growth axes that give rise to leaflets. These axes reflect the sequential generation of cell division foci across the leaf proximodistal axis in response to auxin activity maxima, which are generated by the PINFORMED1 (PIN1) auxin efflux carriers in a process that resembles organogenesis at the SAM. Delimitation of C. hirsuta leaflets also requires the activity of CUPSHAPEDCOTYLEDON (CUC) genes, which direct formation of organ boundaries at the SAM. These observations show how species-specific deployment of fundamental shoot development networks may have sculpted simple versus dissected leaf forms. These studies also illustrate how extending developmental genetic studies to morphologically divergent relatives of model organisms can greatly help elucidate the mechanisms underlying the evolution of form.

Keywords

Leaf development Auxin KNOX proteins 

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Copyright information

© The Botanical Society of Japan and Springer 2009

Authors and Affiliations

  • Claudia Canales
    • 1
  • Michalis Barkoulas
    • 1
  • Carla Galinha
    • 1
  • Miltos Tsiantis
    • 1
  1. 1.Department of Plant SciencesUniversity of OxfordOxfordUK

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