Differentiating Arabidopsis Shoots from Leaves by Combined YABBY Activities
Open Access
- 1 July 2010
- journal article
- Published by Oxford University Press (OUP) in THE PLANT CELL ONLINE
- Vol. 22 (7), 2113-2130
- https://doi.org/10.1105/tpc.110.075853
Abstract
In seed plants, leaves are born on radial shoots, but unlike shoots, they are determinate dorsiventral organs made of flat lamina. YABBY genes are found only in seed plants and in all cases studied are expressed primarily in lateral organs and in a polar manner. Despite their simple expression, Arabidopsis thaliana plants lacking all YABBY gene activities have a wide range of morphological defects in all lateral organs as well as the shoot apical meristem (SAM). Here, we show that leaves lacking all YABBY activities are initiated as dorsiventral appendages but fail to properly activate lamina programs. In particular, the activation of most CINCINNATA-class TCP genes does not commence, SAM-specific programs are reactivated, and a marginal leaf domain is not established. Altered distribution of auxin signaling and the auxin efflux carrier PIN1, highly reduced venation, initiation of multiple cotyledons, and gradual loss of the SAM accompany these defects. We suggest that YABBY functions were recruited to mold modified shoot systems into flat plant appendages by translating organ polarity into lamina-specific programs that include marginal auxin flow and activation of a maturation schedule directing determinate growth.Keywords
This publication has 89 references indexed in Scilit:
- Morphogenesis of Simple and Compound Leaves: A Critical ReviewTHE PLANT CELL ONLINE, 2010
- YABBYs and the Transcriptional Corepressors LEUNIG and LEUNIG_HOMOLOG Maintain Leaf Polarity and Meristem Activity inArabidopsisTHE PLANT CELL ONLINE, 2009
- Differential Recruitment ofWOXTranscription Factors for Lateral Development and Organ Fusion in Petunia andArabidopsisTHE PLANT CELL ONLINE, 2009
- The Transcript and Metabolite Networks Affected by the Two Clades of Arabidopsis Glucosinolate Biosynthesis RegulatorsPlant Physiology, 2008
- A Protracted and Dynamic Maturation Schedule UnderliesArabidopsisLeaf DevelopmentTHE PLANT CELL ONLINE, 2008
- Regulation of LANCEOLATE by miR319 is required for compound-leaf development in tomatoNature Genetics, 2007
- KANADI and Class III HD-Zip Gene Families Regulate Embryo Patterning and Modulate Auxin Flow during Embryogenesis inArabidopsisTHE PLANT CELL ONLINE, 2007
- The Balance between theMIR164AandCUC2Genes Controls Leaf Margin Serration inArabidopsisTHE PLANT CELL ONLINE, 2006
- Control of leaf vascular patterning by polar auxin transportGenes & Development, 2006
- Endogenous and Synthetic MicroRNAs Stimulate Simultaneous, Efficient, and Localized Regulation of Multiple Targets in Diverse SpeciesTHE PLANT CELL ONLINE, 2006