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A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response
Published on: April 17, 2016
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Complex sphingolipid metabolism impacts cell division and plasmodesmal development in the moss Physcomitrium patens
Linus Wegner1, Cornelia Herrfurth2,3, Ivo Feussner2,4
1Institute of Botany, Justus-Liebig University, Giessen 35392, Germany.
Plant Physiology
|November 8, 2025
Summary
Physcomitrium patens mutants lacking essential sphingolipids, like glycosyl inositol phosphorylceramides (GIPCs), exhibit severe defects in cell division, cell plate formation, and plasmodesmata structure. These findings highlight sphingolipids
Area of Science:
- Plant Biology
- Cell Biology
- Biochemistry
Background:
- Glycosyl inositol phosphorylceramides (GIPCs) are essential membrane lipids in plants, but their functions are challenging to study due to severe mutant phenotypes.
- Physcomitrium patens offers a simplified model for studying complex developmental patterning and characterizing severe mutant alleles.
Purpose of the Study:
- To functionally characterize mutants affecting GIPC synthesis in P. patens.
- To investigate the morphological, histological, and cytological consequences of impaired GIPC synthesis.
Main Methods:
- Isolation and biochemical characterization of P. patens mutants in GIPC synthesis pathways (s4h/sbh and ipcs).
- Phenotypic analysis including cell division, expansion, differentiation, and intercellular motility assays.
- Transmission electron microscopy (TEM) to assess cell ultrastructure and plasmodesmata.
Main Results:
- Mutants displayed abnormal cell division planes, irregular cell wall depositions, and incomplete cell divisions.
- Sphingolipid deficiency impacted cell plate formation and cell autonomy.
- Significant plasmodesmal structural defects were observed in s4h and ipcs mutants, correlating with altered macromolecule transport in s4h.
Conclusions:
- Sphingolipids are crucial for proper cell division orientation, cell plate formation, and plasmodesmal structure in P. patens.
- The study provides a toolkit for analyzing cell division and plasmodesmal phenotypes in mosses.
- P. patens is a valuable model for studying severe mutant phenotypes related to fundamental cell functions and sphingolipid metabolism.
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