Chromosomal location of root-knot-resistance gene in the D genome of wheat
1991
Kaloshian, I. | Waines, J.G. | Roberts, P.A. | Thomason, I.J.
Monosomic analysis was used to locate a single, dominant Meloidogyne javanica resistance-gene (Rkn) present in the D-genome of synthetic hexaploid wheat Prosquare derived from Aegilops squarrosa L. G 3489. Lines of Chinese Spring bread wheat monosomic for each of the seven D-genome chromosomes (1D-7D) were crossed with the synthetic hexaploid. On screening the seven F2 generations derived from monosomic F1 plants from the above crosses, six segregated into a 3:1 resistant-to-susceptible ratio in reaction to M. javanica. Monosomic 6D F2 plants deviated from a 3:1 ratio, with a large excess of resistant plants, which indicated that the nematode resistance gene is located on chromosome 6D.
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