A Novel Root-Knot Nematode Resistance QTL on Chromosome Vu01 in Cowpea

G3 : Genes - Genomes - Genetics
Arsenio D NdevePhilip A Roberts

Abstract

The root-knot nematode (RKN) species Meloidogyne incognita and M. javanica cause substantial root system damage and suppress yield of susceptible cowpea cultivars. The narrow-based genetic resistance conferred by the Rk gene, present in some commercial cultivars, is not effective against Rk-virulent populations found in several cowpea production areas. The dynamics of virulence within RKN populations require a broadening of the genetic base of resistance in elite cowpea cultivars. As part of this goal, F1 and F2 populations from the cross CB46-Null (susceptible) x FN-2-9-04 (resistant) were phenotyped for M. javanica induced root-galling (RG) and egg-mass production (EM) in controlled growth chamber and greenhouse infection assays. In addition, F[Formula: see text] families of the same cross were phenotyped for RG on field sites infested with Rk-avirulent M. incognita and M. javanica The response of F1 to RG and EM indicated that resistance to RKN in FN-2-9-04 is partially dominant, as supported by the degree of dominance in the F2 and F[Formula: see text] populations. Two QTL associated with both RG and EM resistance were detected on chromosomes Vu01 and Vu04. The QTL on Vu01 was most effective against aggressive M. javanica, ...Continue Reading

References

Oct 1, 1996·The Plant Cell·V M Williamson, R S Hussey
Sep 1, 1985·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·G C Fernandez, J C Miller
Oct 10, 2015·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Bao-Lam HuynhPhilip A Roberts
Oct 25, 2016·The Plant Journal : for Cell and Molecular Biology·María Muñoz-AmatriaínTimothy J Close
Jan 1, 2018·Journal of Nematology·Arsenio D NdevePhilip A Roberts

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Citations

Nov 22, 2019·Frontiers in Plant Science·Prasanna KankanalaKirankumar S Mysore

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Methods Mentioned

BETA
Assay
genotyping

Software Mentioned

MSTmap
RStudio

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