HortScience (2000) 35, 1344-1346

Zhen-Xiang Lu, Gregory L. Reighard, Andrew P. Nyczepir, Thomas G. Beckman and David W. Ramming (2000)
Inheritance of resistance to root-knot nematodes (Meloidogyne sp.) in Prunus rootstocks
HortScience 35 (7), 1344-1346
Abstract: Two F₁ hybrid Prunus rootstocks, K62-68 and P101-41, developed from a cross of 'Lovell' [susceptible to both Meloidogyne incognita (Kofoid and White) Chitwood and M. javanica (Treub) Chitwood] and 'Nemared' (resistant to both root-knot nematode species), were selfed to produce two F₂ seedling populations. Vegetative propagation by herbaceous stem cuttings was used to produce four or eight self-rooted plants of each F₂ seedling for treatment replications. Eggs of M. incognita and M. javanica were inoculated into the potted media where plants were transplanted, and plants were harvested and roots examined for signs and symptoms associated with root-knot nematode infection ~120 days later. Segregation ratios in both F₂ families suggested that resistance to M. incognita in 'Nemared' is controlled by two dominant genes (Mi and Mij) and that to M. javanica by a single dominant gene (Mij). Thus, Mij conveys resistance to both M. incognita and M. javanica.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Andrew P. Nyczepir

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	Prunus (genus - other than fruit trees)
	Meloidogyne incognita	Prunus (genus - other than fruit trees)