ISHS Acta Horticulturae 465: IV International Peach Symposium
INHERITANCE OF RESISTANCE TO ROOT-KNOT NEMATODES IN PEACH ROOTSTOCKS |
| Authors: | Z.X. Lu, G.L. Reighard, A.P. Nyczepir, T.G. Beckman, D.W. Ramming |
| Keywords: | Prunus persica, Meloidogyne incognita, Meloidogyne javanica |
| Abstract:
Two F1 peach hybrids, K62–68 and P101–41, developed from a cross of Lovell [homozygous susceptible to Meloidogyne incognita (Kofoid and White) Chitwood and M. javanica (Treub) Chitwood] and Nemared (homozygous resistant to both of these root-knot nematodes), were selfed to produce two F2 seedling populations. Vegetative propagation by herbaceous stem cuttings was used to produce 4 to 10 ramets of each F2 seedling for treatment replications. Eggs of M. incognita and/or M. javanica were inoculated onto the root systems of the ramets. Seedlings were harvested and roots examined for signs and symptoms associated with root-knot nematode infection approximately 120 days after inoculation. Segregation ratios in both F2 families suggested that resistance to M. incognita in Nemared is controlled by two dominant genes (Mi, Mij), and resistance to M. javanica in Nemared is also controlled by two dominant genes (Mj, Mij). One gene (Mij) appeared to be shared for resistance to both M. incognita and M. javanica. | |
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