Differentiation of conductive cells: a matter of life and death

•Sieve elements and tracheary elements are specialized conductive cells.•Phloem sieve elements undergo selective autolysis and enucleation.•Xylem tracheary elements undergo programmed cell death and autolysis.•Sieve elements and tracheary elements have thickened walls (primary vs. secondary).•Emergi...

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Bibliographic Details
Published in:Current opinion in plant biology 2017-02, Vol.35, p.23-29
Main Authors: Heo, Jung-ok, Blob, Bernhard, Helariutta, Ykä
Format: Article
Language:English
Subjects:
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis - metabolism
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Cell Differentiation
Phloem - physiology
Plant Development - genetics
Plant Proteins - genetics
Plant Proteins - metabolism
Transcription Factors - genetics
Transcription Factors - metabolism
Xylem - physiology
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Summary:•Sieve elements and tracheary elements are specialized conductive cells.•Phloem sieve elements undergo selective autolysis and enucleation.•Xylem tracheary elements undergo programmed cell death and autolysis.•Sieve elements and tracheary elements have thickened walls (primary vs. secondary).•Emerging genetic networks for xylem and phloem bear some structural similarities. Two major conducting tissues in plants, phloem and xylem, are composed of highly specialized cell types adapted to long distance transport. Sieve elements (SEs) in the phloem display a thick cell wall, callose-rich sieve plates and low cytoplasmic density. SE differentiation is driven by selective autolysis combined with enucleation, after which the plasma membrane and some organelles are retained. By contrast, differentiation of xylem tracheary elements (TEs) involves complete clearance of the cellular components by programmed cell death followed by autolysis of the protoplast; this is accompanied by extensive deposition of lignin and cellulose in the cell wall. Emerging molecular data on TE and SE differentiation indicate a central role for NAC and MYB type transcription factors in both processes.
ISSN:1369-5266
1879-0356
DOI:10.1016/j.pbi.2016.10.007