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Research ArticleResearch Article
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CLV3 Is Localized to the Extracellular Space, Where It Activates the Arabidopsis CLAVATA Stem Cell Signaling Pathway

Enrique Rojo, Vijay K. Sharma, Valentina Kovaleva, Natasha V. Raikhel, Jennifer C. Fletcher
Enrique Rojo
aDepartment of Botany and Plant Sciences and Center for Plant Cell Biology, University of California, Riverside, California 92521
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Vijay K. Sharma
bUnited States Department of Agriculture Plant Gene Expression Center, University of California Berkeley Plant and Microbial Biology Department, 800 Buchanan Street, Albany, California 94710
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Valentina Kovaleva
aDepartment of Botany and Plant Sciences and Center for Plant Cell Biology, University of California, Riverside, California 92521
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Natasha V. Raikhel
aDepartment of Botany and Plant Sciences and Center for Plant Cell Biology, University of California, Riverside, California 92521
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Jennifer C. Fletcher
bUnited States Department of Agriculture Plant Gene Expression Center, University of California Berkeley Plant and Microbial Biology Department, 800 Buchanan Street, Albany, California 94710
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Published May 2002. DOI: https://doi.org/10.1105/tpc.002196

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Abstract

Plant growth and development depends on the activity of a continuously replenished pool of stem cells within the shoot apical meristem to supply cells for organogenesis. In Arabidopsis, the stem cell–specific protein CLAVATA3 (CLV3) acts cell nonautonomously to restrict the size of the stem cell population, but the hypothesis that CLV3 acts as an extracellular signaling molecule has not been tested. We used genetic and immunological assays to show that CLV3 localizes to the apoplast and that export to the extracellular space is required for its function in activating the CLV1/CLV2 receptor complex. Apoplastic localization allows CLV3 to signal from the stem cell population to the organizing center in the underlying cells.

  • Received February 6, 2002.
  • Accepted February 11, 2002.
  • Published May 2, 2002.
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CLV3 Is Localized to the Extracellular Space, Where It Activates the Arabidopsis CLAVATA Stem Cell Signaling Pathway
Enrique Rojo, Vijay K. Sharma, Valentina Kovaleva, Natasha V. Raikhel, Jennifer C. Fletcher
The Plant Cell May 2002, 14 (5) 969-977; DOI: 10.1105/tpc.002196

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CLV3 Is Localized to the Extracellular Space, Where It Activates the Arabidopsis CLAVATA Stem Cell Signaling Pathway
Enrique Rojo, Vijay K. Sharma, Valentina Kovaleva, Natasha V. Raikhel, Jennifer C. Fletcher
The Plant Cell May 2002, 14 (5) 969-977; DOI: 10.1105/tpc.002196
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The Plant Cell Online: 14 (5)
The Plant Cell
Vol. 14, Issue 5
May 2002
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