ISSN:
1432-2242
Keywords:
Potato cyst-nematode
;
Quantitative trait loci RFLP
;
Distorted segregation
;
Solanum spegazzinii
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract A high level of resistance toGlobodera pallida pathotypes Pa2 and Pa3 exists inSolanum spegazzinii, a wild relative of potato (S. tuberosum ssp.tuberosum). Here we report the mapping of loci 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 ofS. spegazzinii. Additionally, the contribution of the susceptible parent to nematode resistance was determined. TheGpa 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. Our results indicate that a prediction of the genetic constitution of a quantitative trait based solely on phenotypic observations can lead to erroneous conclusions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01253983
