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The Mi gene in tomato confers resistance to Meloidogyne arenaria, M. incognita, and M. javanica. Dr. Williamson initiated efforts to clone this gene immediately upon her appointment at UC-Davis, and completed the task in 1998. It proved to be much more difficult than originally anticipated. Although Mi was mapped fairly rapidly to a 650 kb region of the short arm of chromosome 6, final mapping and cloning was impeded by the lack of polymorphisms in this region. In the end, it turned out that there were two intact gene sequences within a 52 kb region, only one of which actually confers resistance.
Since cloning Mi, Dr. Williamson and her colleagues have worked to characterize the gene and unravel the precise mechanism by which it confers resistance. Mi belongs to a family of similar resistance genes that have conserved LRR, LZ, and NBS domains. One of the unique discoveries that has come from the work on Mi is that, in addition to conferring resistance to Meloidogyne species, Mi also confers resistance to the potato aphid. This will lead to research that may reveal similarities between aphids and Meloidogyne spp. that were previously undreamed of and (or) reveal multiple activities of the resistance gene product. Such research will inevitably lead to a greater understanding of how Mi and similar resistance genes function. Further, with knowledge of the sequence of Mi, the ability to alter specific portions of the sequence, and to then transform tomato and other plants, Dr. Williamson and her colleagues are unraveling the function of a nematode resistance gene.
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Michael Robert Winter, Adam P Taranto,Henok Zemene Yimer, Alison Coomer-Blundell,Shahid Siddique,Valerie M Williamson, Dave H Lunt
biorxiv(2023)
Annual review of phytopathology (2022): 143-162
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