Journal
MOLECULAR PLANT-MICROBE INTERACTIONS
Volume 16, Issue 7, Pages 645-649Publisher
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/MPMI.2003.16.7.645
Keywords
Bemisia argentifolii; Macrosiphum euphorbiae; Meloidogyne spp.; Mi gene; plant resistance; transgenic plants
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The tomato gene Mi-1.2 confers resistance against root-knot nematodes and some isolates of potato aphid. Resistance to the whitefly Bemisia tabaci previously has been observed in Mi-bearing commercial tomato cultivars, suggesting that Mi, or a closely linked gene, is responsible for the resistance. The response of two biotypes of B. tabaci to tomato carrying the cloned Mi was compared with that of the isogenic untransformed tomato line Moneymaker. Our results indicate that Mi-1.2 is responsible for the resistance in tomato plants to both B- and Q- biotypes. Mi-1.2 is unique among characterized resistance genes in its activity against three very different organisms (root-knot nematodes, aphids, and whiteflies). These pests are among the most important on tomato crops worldwide, making Mi a valuable resource in integrated pest management programs.
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