The Rk locus
in cowpea has been used extensively to breed root-knot
nematode resistant varieties in the USA and other
countries. This gene locus was first designated as Rk by
Fery and Dukes (1980) and it confers resistance to many
populations of M. incognita, M. arenaria, M. hapla, and
M. javanica. Genetic studies have indicated that this locus
may have several alleles including rk, Rk, and Rk2. Rk2
confers broad-based resistance to different races of
M. incognita and M. javanica (Roberts et al., 1996).
The Rk locusin cowpea has been used extensively to breed root-knotnematode resistant varieties in the USA and othercountries. This gene locus was first designated as Rk byFery and Dukes (1980) and it confers resistance to manypopulations of M. incognita, M. arenaria, M. hapla, andM. javanica. Genetic studies have indicated that this locusmay have several alleles including rk, Rk, and Rk2. Rk2confers broad-based resistance to different races ofM. incognita and M. javanica (Roberts et al., 1996).
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