Abstract

Abstract Although previous workers reported that root-knot nematode resistance was controlled by 2 pairs of genes, there were more than 1/16 resistant plants in an F2 population from ‘Alabama No. 1’ (resistant) crossed with ‘Hawaiian Wonder’ (susceptible). The evaluation of F3 families showed that the excess of resistant individuals was not due to escapes. The 2-gene hypothesis was insufficient to account for the segregation patterns in the F3 families, but they could be explained on a 3-gene basis. The simplest genetic explanation is that there are at least 3 pairs of genes which are equal in their action, but a certain minimum number of genes for susceptibility are necessary before all resistance is lost.

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