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PMID:18653559

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Citation

Tucker, MR, Hinze, A, Tucker, EJ, Takada, S, Jürgens, G and Laux, T (2008) Vascular signalling mediated by ZWILLE potentiates WUSCHEL function during shoot meristem stem cell development in the Arabidopsis embryo. Development 135:2839-43

Abstract

Stem cells are maintained in an undifferentiated state by signals from their microenvironment, the stem cell niche. Despite its central role for organogenesis throughout the plant's life, little is known about how niche development is regulated in the Arabidopsis embryo. Here we show that, in the absence of functional ZWILLE (ZLL), which is a member of the ARGONAUTE (AGO) family, stem cell-specific expression of the signal peptide gene CLAVATA3 (CLV3) is not maintained despite increased levels of the homeodomain transcription factor WUSCHEL (WUS), which is expressed in the organising centre (OC) of the niche and normally promotes stem cell identity. Tissue-specific expression indicates that ZLL acts to maintain the stem cells from the neighbouring vascular primordium, providing direct evidence for a non-cell-autonomous mechanism. Furthermore, mutant and marker gene analyses suggest that during shoot meristem formation, ZLL functions in a similar manner but in a sequential order with its close homologue AGO1, which mediates RNA interference. Thus, WUS-dependent OC signalling to the stem cells is promoted by AGO1 and subsequently maintained by a provascular ZLL-dependent signalling pathway.

Links

PubMed Online version:10.1242/dev.023648

Keywords

Arabidopsis/cytology; Arabidopsis/embryology; Arabidopsis/metabolism; Arabidopsis Proteins/metabolism; Embryonic Development; Homeodomain Proteins/metabolism; Meristem/growth & development; Meristem/metabolism; Mutation/genetics; Recombinant Fusion Proteins/metabolism; Seeds/cytology; Seeds/metabolism; Signal Transduction; Stem Cells/cytology; Stem Cells/metabolism

Significance

Annotations

Gene product Qualifier GO ID GO term name Evidence Code with/from Aspect Notes Status


See also

References

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