Abstract
The developmental ontogeny of the vascular system (consisting of xylem, phloem and [pro]cambium) is poorly understood despite its central role in plant physiology. We show that in the Arabidopsis root meristem, xylem cell lineages are specified early, whereas phloem and procambium are established through a set of asymmetric cell divisions. These divisions require the WOODEN LEG (WOL) gene. The WOL gene encodes a novel two-component signal transducer with an unusual tandem arrangement of two receiver domains. It is expressed specifically in the vasculature from the early stages of embryogenesis on, consistent with a role as a sensor for vascular morphogenesis.
Publication types
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Amino Acid Sequence
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Arabidopsis / enzymology*
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Arabidopsis / genetics
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Arabidopsis / growth & development*
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Arabidopsis / metabolism
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Base Sequence
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Cell Division
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DNA, Plant
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Histidine Kinase
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Molecular Sequence Data
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Morphogenesis
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Plant Roots / growth & development
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Protein Kinases / genetics
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Protein Kinases / metabolism*
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Protein Kinases / physiology
Substances
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DNA, Plant
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Protein Kinases
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Histidine Kinase
Associated data
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GENBANK/AA586219
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GENBANK/AB011485
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GENBANK/AC004557
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GENBANK/AC007069
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GENBANK/AI992824
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GENBANK/AJ234550
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GENBANK/AJ278528
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GENBANK/AJ278529
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GENBANK/AJ278530
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GENBANK/T20648
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GENBANK/U42597