Abstract
We have localized two cell-wall-matrix polysaccharides, the main pectic polysaccharide, rhamnogalacturonan I (RG-I), and the hemicellulose, xyloglucan (XG), in root-tip and leaf tissues of red clover (Trifolium pratense L.) using immunoelectron microscopy. Our micrographs show that in both leaf and root tissues RG-I is restricted to the middle lamella, with 80–90% of the label associated with the expanded regions of the middle lamella at the corner junctions between cells. Xyloglucan, however, is nearly exclusively located in the cellulose-microfibril-containing region of the cell wall. Thus, these cell-wall-matrix polysaccharides are present in distinct and complementary regions of the cell wall. Our results further show that during cell expansion both RG-I and XG are present within Golgi cisternae and vesicles, thus confirming that the Golgi apparatus is the main site of synthesis of the non-cellulosic cell-wall polysaccharides. No label is seen over the endoplasmic reticulum, indicating that synthesis of these complex polysaccharides is restricted to the Golgi. The distribution of RG-I and XG in root-tip cells undergoing cell division was also examined, and it was found that while XG is present in the Golgi stacks and cell plate during cytokinesis, RG-I is virtually absent from the forming cell plate.
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Abbreviations
- ER:
-
endoplasmic reticulum
- RG-I:
-
rhamnogalacturonan I
- XG:
-
xyloglucan
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Moore, P.J., Staehelin, L.A. Immunogold localization of the cell-wall-matrix polysaccharides rhamnogalacturonan I and xyloglucan during cell expansion and cytokinesis inTrifolium pratense L.; implication for secretory pathways. Planta 174, 433–445 (1988). https://doi.org/10.1007/BF00634471
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DOI: https://doi.org/10.1007/BF00634471