Quantitatively-inherited resistance to Globodera pallida is dominated by one major locus in Solanum spegazzinii
1994
Kreike, C.M. | Koning, J.R.A. de | Vinke, J.H. | Ooijen, J.W. van | Stiekema, W.J. (DLO-Centre for Plant Breeding and Reproduction Research, Wageningen (Netherlands). Dept. of Molecular Biology)
A high level of resistance to Globodera pallida pathotypes Pa2 and Pa3 exists in Solanum spegazinii, a wild relative of potato (S. tuberosum ssp. tuberosum). The mapping of loci is rported involved in quantitatively inherited nematode resistance with the use of RFLPs. One major locus, Gpa, was mapped on chromosome 5 and two minor loci on chromosomes 4 and 7 of S. spegazzinii. Additionally, the contribution of the susceptible parent to nematode resistance was determined. The Gpa locus was solely responsible for the high resistance level found in the segregating population. However, the RFLP marker closely linked to this resistance locus showed a distorted segregation, with a shortage of plants having the resistance linked allele. These results indicate that a prediction of the genetic constitution of a quantitative trait based solely on phenotypic observations can lead to erroneous conclusions.
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