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QTL mapping of BNYVV resistance from the WB258 source in sugar beet
Author(s) -
Grimmer M. K.,
Kraft T.,
Francis S. A.,
Asher M. J. C.
Publication year - 2008
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2008.01539.x
Subject(s) - biology , sugar beet , genetics , population , gene , quantitative trait locus , gene mapping , plant disease resistance , allele , plant virus , genotype , chromosome , virus , horticulture , demography , sociology
Rhizomania, caused by Beet necrotic yellow vein virus (BNYVV), is an important sugar‐beet disease worldwide. The aim of this study was to investigate and map BNYVV resistance from the WB258 source. Presence of a major resistance gene (termed Rz5 ) was indicated by ∼1 : 1 segregation of virus levels in a population of 170 individuals derived from WB258. The maximum logarithm of odds (LOD) position for Rz5 , identified by interval mapping, explained ∼81% of the phenotypic variance. Rz5 was mapped alongside the previously identified Rz4 from the R36 source. Rz4 and Rz5 were located to 6.9 cM and 6.0 cM regions, respectively, on chromosome III by interval mapping. These locations corresponded well to the position of the widely deployed Rz1 gene, suggesting that the three genes could represent an allelic series. Physical mapping is probably required to confirm this however. BNYVV resistance genes from novel sources are potentially important in breeding for more durable resistance either as separate genes or as BNYVV race‐specific alleles.