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A Cryptic Wheat–Aegilops triuncialis Translocation with Leaf Rust Resistance Gene Lr58

^a Wheat Genetic and Genomic Resources Center, Dep. of Plant Pathology, Kansas State Univ., Manhattan, KS 66506
^b Dep. of Plant Breeding, Genetics & Biotechnology, Punjab Agricultural Univ., Ludhiana, 141004, Punjab, India
^c Dep. of Biotechnology, Indian Institute of Technology, Roorkee, 247667, Uttaranchal, India
^d Plant Science and Entomology Research Unit, USDA-ARS, Kansas State Univ., Manhattan, KS 66506
^e contributed equally to this work

View larger version (116K): [in this window] [in a new window]   Figure 1. Rust resistance in introgression line TA5605 with T2BS.2BL-2tL(0.95): (a) leaf rust (race PRTUS25) reaction of the parents and TA5605 at the seedling stage; (b) leaf rust (race MCDL) reaction of the parents and TA5605 line at the adult stage.

View larger version (50K): [in this window] [in a new window]   Figure 2. Molecular mapping of rust-resistant introgression T2BS·2BL-2tL(0.95) using bulked segregant analysis. Southern hybridization pattern of EcoRV-digested genomic DNA of parents and bulks from homozygous resistant and susceptible F2 plants using probe KSUH16. The restriction fragment length polymorphism fragments diagnostically polymorphic between resistant and susceptible bulks are indicated by arrows. The WL711 allele of XksuH16 replaced by an Aegilops triuncialis-specific allele is indicated with an asterisk.

View larger version (22K): [in this window] [in a new window]   Figure 3. Physical map of chromosome 2B of wheat and inferred genomic in situ hybridization, restriction fragment length polymorphism, and simple sequence repeat marker-based physical map of recombinant wheat–Aegilops triuncialis chromosomes 2B and 2t in WL711 background. In the inferred physical map of the introgression line T2BS·2BL-2tL(0.95), A. triuncialis 2t chromatin is indicated in gray. The solid black bands represent the C-banding pattern of chromosome 2B. The 2L consensus physical map was based on Delaney et al. (1995), Nelson et al. (1995), Dubcovsky et al. (1996), Sharp (1996), Sourdille et al. (2004), and Erayman et al. (2004). Markers used in the present study are shown in bold.