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Inheritance and mapping of Mj-2, a new source of root-knot nematode (Meloidogyne javanica) resistance in carrot

Permanent URL:
http://handle.nal.usda.gov/10113/58508
File:
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Abstract:
Root-knot nematodes limit carrot production around the world by inducing taproot forking and galling deformities that render carrots unmarketable. In warmer climates, Meloidogyne javanica and Meloidogyne incognita are most prevalent. In F2 and F3 progeny from the cross between an Asian carrot resistant to M. javanica, PI 652188, and a susceptible carrot, resistance response was incompletely dominant with a relatively high heritability (H2 = 0.78) and provided evidence for a single gene, designated Mj-2, contributing to resistance. Molecular markers linked to the previously described root-knot nematode resistance gene, Mj-1 on chromosome 8 derived from “Brasilia,” demonstrated that Mj-2 does not map to that same locus but is on the same chromosome.
Author(s):
Aamir Ali , William C. Matthews , Pablo F. Cavagnaro , Massimo Iorizzo , Philip A. Roberts , Philipp W. Simon
Subject(s):
Daucus carota , Meloidogyne incognita , Meloidogyne javanica , carrots , chromosome mapping , genes , genetic markers , genetic resistance , heritability , host-parasite relationships , inheritance (genetics) , loci , pest resistance , progeny , root-knot nematodes
Source:
Journal of heredity 2014 3 1 v.105 no.2
Language:
English
Year:
2014
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.