XYLEM INTERMIXED WITH PHLOEM1, a leucine-rich repeat receptor-like kinase required for stem growth and vascular development in <Emphasis Type="Italic">Arabidopsis thaliana</Emphasis> |
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Authors: | Anthony?C?Bryan Adam?Obaidi Michael?Wierzba Email author" target="_blank">Frans?E?TaxEmail author |
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Institution: | (1) Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ 85721, USA;(2) Department of Plant Sciences, University of Arizona, Tucson, AZ 85721, USA; |
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Abstract: | The regulation of cell specification in plants is particularly important in vascular development. The vascular system is comprised
two differentiated tissue types, the xylem and phloem, which form conductive elements for the transport of water, nutrients
and signaling molecules. A meristematic layer, the procambium, is located between these two differentiated cell types and
divides to initiate vascular growth. We report the identification of a receptor-like kinase (RLK) that is expressed in the
vasculature. Histochemical analyses of mutants in this kinase display an aberrant accumulation of highly lignified cells,
typical of xylem or fiber cells, within the phloem. In addition, phloem cells are sometimes located adjacent to xylem cells
in these mutants. We, therefore, named this RLK XYLEM INTERMIXED WITH PHLOEM 1 (XIP1). Analyses of longitudinal profiles of
xip1 mutant stems show malformed cell files, indicating defects in oriented cell divisions or cell morphology. We propose that
XIP1 prevents ectopic lignification in phloem cells and is necessary to maintain the organization of cell files or cell morphology
in conductive elements. |
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