Abstract
Lignification in Zinnia elegans L. stems is characterized by a burst in the production of H2O2, the apparent fate of which is to be used by xylem peroxidases for the polymerization of p-hydroxycinnamyl alcohols into lignins. A search for the sites of H2O2 production in the differentiating xylem of Z. elegans stems by the simultaneous use of optical (bright field, polarized light and epi-polarization) and electron-microscope tools revealed that H2O2 is produced on the outer-face of the plasma membrane of both differentiating (living) thin-walled xylem cells and particular (non-lignifying) xylem parenchyma cells. From the production sites it diffuses to the differentiating (secondary cell wall-forming) and differentiated lignifying xylem vessels. H2O2 diffusion occurs mainly through the continuous cell wall space. Both the experimental data and the theoretical calculations suggest that H2O2 diffusion from the sites of production might not limit the rate of xylem cell wall lignification. It can be concluded that H2O2 is produced at the plasma membrane in differentiating (living) thin-walled xylem cells and xylem parenchyma cells associated to xylem vessels, and that it diffuses to adjacent secondary lignifying xylem vessels. The results strongly indicate that non-lignifying xylem parenchyma cells are the source of the H2O2 necessary for the polymerization of cinnamyl alcohols in the secondary cell wall of lignifying xylem vessels.
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Abbreviations
- DCFH-DA :
-
2,7-Dichlorofluorescein diacetate
- DIC :
-
Differential interference contrast
- TMB :
-
3,3′,5,5′-Tetramethylbenzidine
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Acknowledgments
This work was supported by grants from the Fundación Séneca (project # PI-70/00615/FS/01) and MCYT (BOS2002-03550).
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Ros Barceló, A. Xylem parenchyma cells deliver the H2O2 necessary for lignification in differentiating xylem vessels. Planta 220, 747–756 (2005). https://doi.org/10.1007/s00425-004-1394-3
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DOI: https://doi.org/10.1007/s00425-004-1394-3