V. Williamson

Publications126
h-index48
Citations8,629
Highly Influential Citations364
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The Root Knot Nematode Resistance Gene Mi from Tomato Is a Member of the Leucine Zipper, Nucleotide Binding, Leucine-Rich Repeat Family of Plant Genes
TLDR
The Mi locus of tomato confers resistance to root knot nematodes, and three open reading frames were identified with similarity to cloned plant disease resistance genes, including Prf, a tomato gene required for resistance to Pseudomonas syringae.
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The nematode resistance gene Mi of tomato confers resistance against the potato aphid.
TLDR
It is shown 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.
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Nematode pathogenesis and resistance in plants.
TLDR
Nematodes comprise a large phylum of animals that includes plant and animal parasites as well as many free-living species, and the Heteroderidae can be divided into two groups: the cyst nematodes, which include the genera Heterodera and Globodera; and the root-knot nematode, which is the most economic damage worldwide.
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Sequence and genetic map of Meloidogyne hapla: A compact nematode genome for plant parasitism
TLDR
Meloidogyne hapla is established as a tractable model plant-parasitic nematode amenable to forward and reverse genetics, and a complete genome sequence is presented that defines a platform to elucidate mechanisms of parasitism by what is the largest uncontrolled group of plant pathogens worldwide.
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Evidence for a Role of the N Terminus and Leucine-Rich Repeat Region of the Mi Gene Product in Regulation of Localized Cell Death
TLDR
The phenotypes of chimeric constructs of the tomato Mi gene indicate that the LRR region of Mi-1.2 has a role in signaling localized cell death and that the N-terminal 161 amino acids have arole in regulating this death.
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Nematode resistance in plants: the battle underground.
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The root-knot nematode resistance gene Mi-1.2 of tomato is responsible for resistance against the whitefly Bemisia tabaci.
TLDR
The tomato gene Mi-1.2 is unique among characterized resistance genes in its activity against three very different organisms (root-knot nematodes, aphids, and whiteflies), making Mi a valuable resource in integrated pest management programs.
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Root-knot nematode resistance genes in tomato and their potential for future use.
  • V. Williamson
  • Biology, Medicine
    Annual review of phytopathology
  • 1998
TLDR
Analysis of transgenic plants revealed the unexpected result that Mi also confers resistance to potato aphids, providing a resource for broadening the base of root-knot nematode resistance in tomato and other crops.
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Application of Pluronic gel to the study of root-knot nematode behaviour
TLDR
Observations demonstrate that Pluronic gel is a useful medium for dissecting attraction of root-knot nematodes to their hosts and for studying additional aspects of their behaviour.
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A PCR-based marker tightly linked to the nematode resistance gene, Mi, in tomato
TLDR
A PCR-based codominant marker has been developed which is tightly linked to Mi, a dominant genetic locus in tomato that confers resistance to several species of root-knot nematode, and allows screening of germplasm where the linkage between Mi and Aps-1 has been lost.
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