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GENOMICS, MOLECULAR GENETICS & BIOTECHNOLOGY

Genetic Mapping of Wheat Curl Mite Resistance Genes Cmc3 and Cmc4 in Common Wheat

^a Dep. of Entomology, Kansas State Univ., Manhattan, KS 66506, USA
^b USDA-ARS-NPA, Plant Science and Entomology Research Unit, Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506, USA
^c Dep. of Plant Pathology, Kansas State Univ., Manhattan, KS 66506, USA

^* Corresponding author (gbg{at}ksu.edu)

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.

Abbreviations: cM, centimorgans • WCM, Wheat Curl Mite • WSMV, Wheat streak mosaic virus

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