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Journal of Experimental Botany, Vol. 52, No. 354, pp. 173-177, January 2001
© 2001 Oxford University Press

Short Communications

Macromolecular trafficking between Nicotiana tabacum and the holoparasite Cuscuta reflexa

Sophie Haupt1,3, Karl J. Oparka1, Norbert Sauer2 and Stefanie Neumann3,4

1 Unit of Cell Biology, Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK
2 Lehrstuhl Botanik II, Molekulare Pflanzenphysiologie, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
3 Martin-Luther-Universität, Halle-Wittenberg, Institut für Pflanzen- und Zellphysiologie, Weinberweg 10, D-06120 Halle/Saale, Germany

Abstract

Transgenic tobacco plants expressing green fluorescent protein (GFP) under the control of the companion cell-specific promoter, AtSUC2, were parasitized by the holoparasite Cuscuta reflexa (dodder). GFP, moving in the translocation stream of the host, was transferred to the Cuscuta phloem via the absorbing hyphae of the parasite. An identical pattern of transfer was observed for the phloem-mobile probe, carboxyfluorescein. Following uptake by the parasite, GFP was translocated and unloaded from the Cuscuta phloem in meristematic sink tissues. Contrary to published data, these observations suggest the presence of a functional symplastic pathway between Cuscuta and its hosts, and demonstrate a considerable capacity for macromolecular exchange between plant species.

Key words: Cuscuta, green fluorescent protein, macromolecular transport, Nicotiana, plasmodesmata, symplastic transport.


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