Inheritance of Resistance to Root-knot Nematodes (Meloidogyne sp.) in Prunus Rootstocks

in HortScience
View More View Less
  • 1 Lethbridge Research Centre, Agriculture and Agri-Food Canada, Lethbridge, Alberta, T1J 4B1, Canada
  • 2 Department of Horticulture, Clemson University, Clemson, SC 29634-0375
  • 3 U.S. Department of Agriculture, Southeastern Fruit and Tree Nut Research Laboratory, Byron, GA 31008
  • 4 U.S. Department of Agriculture, Horticultural Crops Research Laboratory, Fresno, CA 93727

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.

If the inline PDF is not rendering correctly, you can download the PDF file here.

Contributor Notes

To whom reprint requests should be addressed. E-mail address:
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 122 44 11
PDF Downloads 90 35 6