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Updated: May 6, 2026
Screening Cotton Genotypes for Reniform Nematode Resistance
Published on: May 2, 2019
Association of RFLP markers with loci conferring broad-based resistance to the soybean cyst nematode (Heterodera
R A Vierling1, J Faghihi, V R Ferris
1Indiana Crop Improvement Association and Department of Agronomy, Purdue University, 47907-1150, West Lafayette, IN, USA.
Abstract:
Soybean cyst nematode (SCN) is a major soybean yield-limiting pest. The present study was conducted to map broad-based SCN resistance loci from the cultivar 'Hartwig'. Two-hundred F2∶3 lines derived from the cross 'Williams 82' x 'Hartwig' were screened with a fourth-generation SCN inbred and 56 polymorphic molecular markers. Allele states and phenotypes were analyzed using stepwise regression and the model selection was made at P [Symbol: see text] 0.01. Four unlinked RFLP markers (A006, A567, A487, A112) were associated with SCN resistance and the partial coefficient of determinations (R(2)) were 91%, 1%, 1%, and 1%. We have mapped a new, major SCN resistance locus (A006) and three minor loci (A567, A487, A112). This complete mapping will accelerate the transfer of broad-based resistance without linkage drag and aid in the determination of relationships among various SCN-resistant germplasm sources.
