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  • Title: The nematode resistance gene Mi of tomato confers resistance against the potato aphid.
    Author: Rossi M, Goggin FL, Milligan SB, Kaloshian I, Ullman DE, Williamson VM.
    Journal: Proc Natl Acad Sci U S A; 1998 Aug 18; 95(17):9750-4. PubMed ID: 9707547.
    Abstract:
    Resistance against the aphid Macrosiphum euphorbiae previously was observed in tomato and attributed to a novel gene, designated Meu-1, tightly linked to the nematode resistance gene, Mi. Recent cloning of Mi allowed us to determine whether Meu-1 and Mi are the same gene. We show that Mi is expressed in leaves, that aphid resistance is isolate-specific, and that susceptible tomato transformed with Mi is resistant to the same aphid isolates as the original resistant lines. We conclude that Mi and Meu-1 are the same gene and that Mi mediates resistance against both aphids and nematodes, organisms belonging to different phyla. Mi is the first example of a plant resistance gene active against two such distantly related organisms. Furthermore, it is the first isolate-specific insect resistance gene to be cloned and belongs to the nucleotide-binding, leucine-rich repeat family of resistance genes.
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