Journal of Nematology (1998) 30, 76-80

E.A. Tzortzakakis, D.L. Trudgill and M.S. Phillips (1998)
Evidence for a dosage effect of the Mi gene on partially virulent isolates of Meloidogyne javanica
Journal of Nematology 30 (1), 76-80
Abstract: The reproduction of single egg-mass isolates of Meloidogyne javanica from Crete that differed in virulence were compared on tomato (Lycopersicon esculentum) genotypes homozygous or heterozygous for the Mi gene. The reproduction of three isolates with partial virulence was much greater on tomato genotypes heterozygous for the Mi gene (cultivars Scala, Bermuda, and 7353) than on two homozygous genotypes (F8 inbred lines derived from Scala). The reproduction of a highly virulent isolate on the homozygous and heterozygous genotypes was similar to that on a susceptible cultivar. These results pose questions regarding the nature of partial virulence and indicate a quantitative effect of the Mi gene in relation to such virulence.
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Database assignments for author(s): Emmanuel A. Tzortzakakis

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Meloidogyne javanica	Tomato (Solanum lycopersicum)	Greece