Brassinosteroid production and signaling differentially control cell division and expansion in the leaf
© 2012 The Authors. New Phytologist © 2012 New Phytologist Trust.
| Veröffentlicht in: | The New phytologist. - 1990. - 197(2013), 2 vom: 15. Jan., Seite 490-502 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2013
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| Zugriff auf das übergeordnete Werk: | The New phytologist |
| Schlagworte: | Journal Article Research Support, Non-U.S. Gov't Arabidopsis Proteins Brassinosteroids Protein Kinases EC 2.7.- BRI1 protein, Arabidopsis EC 2.7.11.1 |
| Zusammenfassung: | © 2012 The Authors. New Phytologist © 2012 New Phytologist Trust. Brassinosteroid (BR) hormones control plant growth through acting on both cell expansion and division. Here, we examined the role of BRs in leaf growth using the Arabidopsis BR-deficient mutant constitutive photomorphogenesis and dwarfism (cpd). We show that the reduced size of cpd leaf blades is a result of a decrease in cell size and number, as well as in venation length and complexity. Kinematic growth analysis and tissue-specific marker gene expression revealed that the leaf phenotype of cpd is associated with a prolonged cell division phase and delayed differentiation. cpd-leaf-rescue experiments and leaf growth analysis of BR biosynthesis and signaling gain-of-function mutants showed that BR production and BR receptor-dependent signaling differentially control the balance between cell division and expansion in the leaf. Investigation of cell cycle markers in leaves of cpd revealed the accumulation of mitotic proteins independent of transcription. This correlated with an increase in cyclin-dependent kinase activity, suggesting a role for BRs in control of mitosis |
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| Beschreibung: | Date Completed 21.05.2013 Date Revised 20.04.2021 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1469-8137 |
| DOI: | 10.1111/nph.12036 |