期刊
EMBO JOURNAL
卷 32, 期 1, 页码 149-158出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/emboj.2012.303
关键词
auxin; endodermis; founder cell; lateral root initiation; pericycle
资金
- ERC starting independent research grant [ERC-2007-Stg-207362-HCPO]
- Special Research Fund of Ghent University
- BBSRC IPA
- Interuniversity Attraction Poles Programme [IUAP VI/33]
- Belgian State, Science Policy Office
- BBSRC [BB/D019613/1, BB/H020314/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/H020314/1, BB/D019613/1] Funding Source: researchfish
Lateral root (LR) formation is initiated when pericycle cells accumulate auxin, thereby acquiring founder cell (FC) status and triggering asymmetric cell divisions, giving rise to a new primordium. How this auxin maximum in pericycle cells builds up and remains focused is not understood. We report that the endodermis plays an active role in the regulation of auxin accumulation and is instructive for FCs to progress during the LR initiation (LRI) phase. We describe the functional importance of a PIN3 (PIN-formed) auxin efflux carrier-dependent hormone reflux pathway between overlaying endodermal and pericycle FCs. Disrupting this reflux pathway causes dramatic defects in the progress of FCs towards the next initiation phase. Our data identify an unexpected regulatory function for the endodermis in LRI as part of the fine-tuning mechanism that appears to act as a check point in LR organogenesis after FCs are specified. The EMBO Journal (2013) 32, 149-158. doi:10.1038/emboj.2012.303; Published online 23 November 2012
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