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GrainGenes Reference Report: CRS-43-644

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Reference
CRS-43-644
Title
Genetic mapping of wheat curl mite resistance genes Cmc3 and Cmc4 in common wheat
Journal
Crop Science
Year
2003
Volume
43
Pages
644-650
Author
Malik R
Brown-Guedira GL
Smith CM
Harvey TL
Gill BS
Abstract
Summary: To diversify the genetic base of resistance in wheat (Triticum aestivum L.) to the wheat curl mite (WCM), Aceria tosichella Keifer, resistance to this pest was transferred from the dipolid goatgrass Aegilops taushcii (Coss.). Schmal. to the hard red winter wheat germplasm KS96WGRC40 by backcrossing to the cultivar TAM 107. KS96WGRC40 has WCM resistance derived from both Ae. tauschii and rye (Secale cereale L.). The objectives of this study were to determine if a unique WCM resistance gene was transferred from Ae. tauschii to KS96WGRC40 and to determine the chromosome and linkage map locations of the WCM resistance genes in the germplasm. The rye-derived WCM resistance gene in TAM 107 and KS96WGRC40, designated Cmc3, is present on wheat-rye translocation T1AL.1RS. Marker analysis of a segregating F2 population revealed that the rye-specific microsatellite marker SCM09 can be used to select wheat lines carrying the 1RS segment and Cmc3. Allelism tests indicated that the Ae. tauschii-derived WCM resistance gene in KS96WGRC40, designated Cmc4, segregated independently of the Cmc1 gene previously transferred from this species. Molecular and cytogenetic analyses located Cmc4 distally on chromosome 6DS flanked by markers Xgdm141 (4.1 centimorgans, cM) and XksuG8 (6.4 cM). The linked markers may be used in wheat breeding programs for the selection of lines resistant to WCM and for gene pyramiding
Keyword
[ Hide all but 1 of 41 ]
aegilops
aegilops tauschii
backcrossing
base
bread wheat
breeding
breeding programs
chromosome
common wheat
crop
cultivar
d genome
eriophyidae
f-2 population
gene
gene-pyramiding
genetic mapping
germplasm
linkage
linkage map
map
mapping
microsatellite
microsatellite marker
mite
pest
population
program
resistance
resistant
rye
secale cereale
selection
streak mosaic-virus
tauschii
translocation
triticum
triticum aestivum
wheat breeding
wheat lines
winter

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