ISSN:
1432-2242
Keywords:
Key words RFLPs
;
Solanum spegazzinii
;
Globodera sp.
;
Interlocus interaction
;
Intralocus interaction
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract A backcross population, derived from the cross (S. tuberosum×S. spegazzinii)×S. tuberosum was used to map QTLs involved in nematode resistance, tuber yield and root development. Complete linkage maps were available for the interspecific hybrid parent as well as the S. tuberosum parent, and interval mapping for all traits was performed for both. Additionally, the intra- and inter-locus interactions of the QTLs were examined. The Gro1.2 locus, involved in resistance to G. rostochiensis pathotype Ro1, that was previously mapped in the S. tuberosum×S. spegazzinii F1 population, was located more precisely on chromosome 10. A new resistance locus, Gro1.4, also conferring resistance to G. rostochiensis pathotype Ro1, was found on chromosome 3. Different alleles of this locus originating from both parents contributed to the resistant phenotype, indicating multiallelism at this locus. No interlocus interactions were observed between these two resistance loci. For resistance to G. pallida no QTLs were detected. One minor QTL involved in tuber yield was located on chromosome 4. Two QTLs involved in root development and having large effects were mapped on chromosomes 2 and 6 and an epistatic interaction was found between these two loci.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s001220050150
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