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| Content Provider | Springer Nature Link |
|---|---|
| Author | Canales, Claudia Barkoulas, Michalis Galinha, Carla Tsiantis, Miltos |
| Copyright Year | 2009 |
| 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 CUP SHAPED COTYLEDON (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. |
| Starting Page | 25 |
| Ending Page | 33 |
| Page Count | 9 |
| File Format | |
| ISSN | 09189440 |
| Journal | Journal of Plant Research |
| Volume Number | 123 |
| Issue Number | 1 |
| e-ISSN | 16180860 |
| Language | English |
| Publisher | Springer Japan |
| Publisher Date | 2009-10-08 |
| Publisher Place | Japan |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Leaf development Auxin KNOX proteins Plant Biochemistry Plant Physiology Plant Ecology Plant Sciences |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science |
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