title: QTL mapping of BNYVV resistance from the WB41 source in sugar beet.
abstract: The most important rhizomania-resistance gene in sugar beet is the Rz1 gene from the Holly Sugar Company in California, the source widely used to breed partially resistant varieties. Other important gene sources are WB41 and WB42, which both originate from Beta vulgaris subsp. maritima collected in Denmark, and which have been reported to be similar. The major resistance gene in WB42 is known as Rz2. We studied the resistance in WB41 and used markers to map the major resistance gene in this source, which we call Rz3. It was identified on chromosome III. This is the chromosome that Rz1 and Rz2 have been mapped to. Data from greenhouse tests and ELISA showed that Rz3 had incomplete penetrance, with heterozygotes varying widely in resistance levels. The involvement of additional minor genes in the strong resistance of the original WB41 source cannot be excluded.
authors.affiliation: Syngenta Seeds AB, Landskrona, Sweden.
authors.forename: Sara
authors.initials: S
authors.lastname: Gidner
authors.forename: Britt-Louise
authors.initials: BL
authors.lastname: Lennefors
authors.forename: Nils-Otto
authors.initials: NO
authors.lastname: Nilsson
authors.forename: Jan
authors.initials: J
authors.lastname: Bensefelt
authors.forename: Evert
authors.initials: E
authors.lastname: Johansson
authors.forename: Ulf
authors.initials: U
authors.lastname: Gyllenspetz
authors.forename: Thomas
authors.initials: T
authors.lastname: Kraft
mesh_terms: D027461:Beta vulgaris / Q000235:genetics* / Q000821:virology; D032461:Chromosomes, Plant / Q000235:genetics*; D017343:Genes, Plant / Q000235:genetics*; D010935:Plant Diseases / Q000235:genetics*; D010942:Plant Viruses / Q000502:physiology*; D040641:Quantitative Trait Loci