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GrainGenes Reference Report: TAG-107-509

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Reference	TAG-107-509
Title	Mapping genes affecting flowering time and frost resistance on chromosome 5B of wheat
Journal	Theoretical and Applied Genetics
Year	2003
Volume	107
Pages	509-514
Author	Toth B Galiba G Feher E Sutka J Snape JW
Abstract	Two populations of single chromosome recombinant lines were used to map genes controlling flowering time on chromosome 5B of wheat, and one of the populations was also used to map a new frost resistance gene. Genetic maps were developed, mainly using microsatellite markers, and QTL analysis was applied to phenotypic data on the performance of each population collected from growth-room tests of flowering time and frost tolerance. Using a recombinant substitution-line mapping population derived from a cross between the substitution-line 'Chinese Spring' ('Cheyenne' 5B) and 'Chinese Spring' (CS), the gene Vrn-B1, affecting vernalization response, an earliness per se locus, Eps-5BL1, and a gene, Fr-B1, affecting frost resistance, were mapped. Using a 'Hobbit Sib' ('Chinese Spring' 5BL) x 'Hobbit Sib' recombinant substitution line mapping population, an earliness per se locus, Eps-5BL2 was mapped. The Vrn-B1 locus was mapped on the distal portion of the long arm of chromosome 5B, to a region syntenous with the segments of chromosomes 5A and 5D containing Vrn-A1 and Vrn-D1 loci, respectively. The two Eps-5BL loci were mapped close to the centromere with a 16-cM distance from each other, one in agreement with the position of a homoeologous locus previously mapped on chromosome 5H of barley, and suggested by the response of 'Chinese Spring' deletion lines. The Fr-B1 gene was mapped on the long arm of chromosome 5B, 40 cM from the centromeric marker. Previous comparative mapping data with rice chromosome 9 would suggest that this gene could be orthologous to the other Fr genes mapped previously by us on chromosomes 5A or 5D of wheat, although in a more proximal position. This study completes the mapping of these homoeoallelic series of vernalization requirement genes and frost resistance genes on the chromosomes of the homoeologous group 5 in wheat.
External Databases	Pubmed: 12734655 https://doi.org/10.1007/s00122-003-1275-3
Gene	Fr-B2 (Triticum)
Gene Class	Frost resistance
Locus	Fr-B2
QTL	Eps-5BL.1 Eps-5BL.2
Keyword	[ Hide all but 1 of 36 ] 5a barley bread wheat centromere chinese comparative mapping deletion earliness earliness per se flowering flowering time fr1 genes frost resistance frost tolerance gene long arm map mapping mapping genes performance position qtl qtl analysis quantitative trait loci resistance rice se series spring substitution substitution line tolerance vernalization vernalization requirement vernalization response vrn-b1

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