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The tomato Mi-1 gene confers resistance to both root-knot nematodes and potato aphids

Abstract

Mi-1, a Lycopersicon peruvianum gene conferring resistance to the agricultural pests, root-knot nematodes, and introgressed into tomato, has been cloned using a selective restriction fragment amplification based strategy. Complementation analysis of a susceptible tomato line with a 100 kb cosmid array yielded a single cosmid clone capable of conferring resistance both to the root-knot nematode Meloidogyne incognita and to an unrelated pathogen, the potato aphid Macrosiphum euphorbiae. This resistance was stable. The Mi-1 gene encodes a protein sharing structural features with the nucleotide-binding site leucine-rich repeat–containing type of plant resistance genes.

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Figure 1: Positional cloning of Mi-1.
Figure 2: Root-knot nematode (Meloidogyne incognita) resistance. (A) The root system of a susceptible control plant (52201).
Figure 3: Potato aphid (Macrosiphum euphorbiae) resistance.
Figure 4: Structure of the Mi-1 gene.
Figure 5: Identification of Mi-1 homologs.

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Acknowledgements

We thank Jerina Pot and Maarten van Riel for artwork. We acknowledge the staff of De Ruiter Seeds and Enza Zaden for performing the nematode tests and of Rijk Zwaan for the aphid tests. This work was financed by Keygene N.V. and three Dutch breeding companies: De Ruiter Seeds, Enza Zaden, and Rijk Zwaan. Furthermore, this work was subsidized by the Dutch Ministry of Economic Affairs through a Programmatische Bedrijfsgerichte Technologie Stimulering grant. AFLP is a registered trademark of Keygene N.V.

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Correspondence to Pieter Vos†.

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Vos†, P., Simons†, G., Jesse, T. et al. The tomato Mi-1 gene confers resistance to both root-knot nematodes and potato aphids. Nat Biotechnol 16, 1365–1369 (1998). https://doi.org/10.1038/4350

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