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Development, Vol 124, Issue 23 4887-4895, Copyright © 1997 by Company of Biologists

JOURNAL ARTICLES

Chitin oligosaccharides can induce cortical cell division in roots of Vicia sativa when delivered by ballistic microtargeting

HR Schlaman, AA Gisel, NE Quaedvlieg, GV Bloemberg, BJ Lugtenberg, JW Kijne, I Potrykus, HP Spaink and C Sautter
Institute of Molecular Plant Sciences, Leiden University, Clusius Laboratory, The Netherlands.

Rhizobia, bacterial symbionts of leguminous plants, produce lipo-chitin oligosaccharide (LCO) signal molecules that can induce nodule organogenesis in the cortex of legume roots in a host-specific way. The multi-unsaturated fatty acyl and the O-acetyl moieties of the LCOs of Rhizobium leguminosarum biovar viciae were shown to be essential for obtaining root nodule induction in Vicia sativa plants. We have used ballistic microtargeting as a novel approach to deliver derivatives of the nodulation signal molecules inside the roots of V. sativa. This method offers the unique ability to introduce soluble compounds into the tissue at a small area. The mitogenic effect of microtargeting of chitin oligosaccharides, including an analysis of the influence of the chain length and modifications, was tested in a qualitative assay. The role of a cell division factor from the root stele, uridine, has also been examined in these experiments. The results show that O-acetylated chitin oligosaccharides can induce root cortical cell divisions when delivered by microtargeting. For this effect it is essential that uridine is co-targeted. The foci of cortical cell division were often similar to root nodule primordia. Anatomical examination also revealed chimeric structures that share characteristics with lateral root and nodule primordia. Our data favour a model in which the oligosaccharide moiety of the rhizobial LCO induces cortical cell division and the fatty acyl moiety plays a role in transport of the LCO into the plant tissue.
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© The Company of Biologists Ltd 1997