Abstract
Microdistribution of mannans in Arabidopsis stem was examined using immunolocalization with mannan-specific monoclonal antibodies (LM21 and LM22). Mannan labeling in secondary xylem cells (except for protoxylem vessels) was initially detected in the cell wall during S2 formation and increased gradually during development. Labeling in metaxylem vessels (vessels) was detected earlier than that in xylary fibers (fibers), but was much weaker than fibers. The S1 layer of vessels and fibers showed much less labeling than the S2 layer. Some strong labeling was also detected in pit membranes of vessel pits. Interfascicular fibers (If-fibers) showed more heterogeneous labeling patterns than fibers by LM21. Unlike fibers, If-fibers also revealed some strong labeling in the cell corner of the S1 layer, indicating different mannan labeling patterns between If-fibers and fibers. Interestingly, protoxylem vessels (proto-vessels) showed strong labeling at the early stage of secondary xylem formation with more intense labeling in the outer- than inner cell wall even though fibers and vessels showed no or very low labeling at this stage. Labeling intensity of proto-vessels was also much stronger than vessels and stronger or slightly weaker than fibers by LM21 and LM22, respectively. Using pectinase and mild alkali treatment, the presence of mannans in parenchymatous cells was also confirmed. Together our observations indicate that there are temporal and spatial variations in mannan labeling between cell types in the secondary xylem of Arabidopsis stems. Some similar features of mannan labeling between Arabidopsis and poplar are also discussed.
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Abbreviations
- HG:
-
Homogalacturonan
- If:
-
Interfascicular
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The authors gratefully acknowledge funding provided by the Formas FuncFiber Center of Excellence (http://www.funcfiber.se) and Formas Projects 2008-1399 and 2009-582.
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Kim, J.S., Daniel, G. Immunolocalization of hemicelluloses in Arabidopsis thaliana stem. Part II: Mannan deposition is regulated by phase of development and its patterns of temporal and spatial distribution differ between cell types. Planta 236, 1367–1379 (2012). https://doi.org/10.1007/s00425-012-1687-x
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DOI: https://doi.org/10.1007/s00425-012-1687-x