Resistance to Melampsora larici-epitea leaf rust in Salix: analyses of quantitative trait loci
2008 (English)In: Journal of Applied Genetics, ISSN 1234-1983, Vol. 49, no 4, 321-331 p.Article in journal (Refereed) Published
Quantitative resistance of Salix to Melampsora larici--epitea leaf rust was studied in 2 Salix mapping populations. One population was a backcross between a S, schwerinii x S. viminalis hybrid and S. viminalis, and the other was all F-2 population between S. viminalis and S. dasyclados. A leaf disc bioassay was used to study the components of quantitative resistance (latent period, uredinia number, and uredinia size) to 3 isolates of the leaf rust. The analysis of quantitative trait loci (QTLs) revealed 9 genomic regions in the backcross population and 7 genomic regions in the F-2 population that were important for rust resistance, with QTLs explaining 8-26% of the phenotypic variation. An important genomic region was identified for the backcross population in linkage group 2, where QTLs were identified for all resistance components for 2 of the rust isolates. Four of the QTLs had overlapping mapping intervals, demonstrating a common genetic background for latent period, uredinia diameter, and uredinia number. QTLs specific to some rust isolates and to some resistance components were also found, indicating a combination of common and specific mechanisms involved in the various resistance components. Breeding implications in relation to these findings are discussed.
Place, publisher, year, edition, pages
2008. Vol. 49, no 4, 321-331 p.
leaf disc inoculation, Melampsora larici-epitea, QTL mapping, quantitative resistance, Salix dasyclados, Salix schwerinii, Salix viminalis, short-rotation coppice, hybrid poplars, populina, willow, gene, aflp, components, mixtures, races, spp.
IdentifiersURN: urn:nbn:se:su:diva-57711ISI: 000261077700002OAI: oai:DiVA.org:su-57711DiVA: diva2:417653
authorCount :42011-05-172011-05-162011-05-17Bibliographically approved