title: Development and characterization of wheat- Leymus racemosus translocation lines with resistance to Fusarium Head Blight.
abstract: Wheat scab (Fusarium Head Blight, FHB) is a destructive disease in the warm and humid wheat-growing areas of the world. Finding diverse sources of FHB resistance is critical for genetic diversity of resistance for wheat breeding programs. Leymus racemosus is a wild perennial relative of wheat and is highly resistant to FHB. Three wheat- L. racemosus disomic addition (DA) lines DA 5 Lr#1, DA 7 Lr#1 and DALr.7 resistant to FHB were used to develop wheat- L.racemosus translocation lines through irradiation and gametocidal gene-induced chromosome breakage. A total of nine wheat-alien translocation lines with wheat scab resistance were identified by chromosome C-banding, GISH, telosomic pairing and RFLP analyses. In line NAU 614, the long arm of 5 Lr#1 was translocated to wheat chromosome 6B. Four lines, NAU 601, NAU 615, NAU 617, and NAU 635, had a part of the short arm of 7 Lr#1 transferred to different wheat chromosomes. Four other lines, NAU 611, NAU 634, NAU 633, and NAU 618, contained translocations involving Leymus chromosome Lr.7 and different wheat chromosomes. The resistance level of the translocation lines with a single alien chromosome segment was higher than the susceptible wheat parent Chinese Spring but lower than the alien resistant parent L. racemosus. At least three resistance genes in L. racemosus were identified. One was located on chromosome Lr.7, and two could be assigned to the long arm of 5 Lr#1 and the short arm of 7 Lr#1.
authors.affiliation: The National Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China. pdchen@njau.edu.cn
authors.forename: Peidu
authors.initials: P
authors.lastname: Chen
authors.forename: Wenxuan
authors.initials: W
authors.lastname: Liu
authors.forename: Jianhua
authors.initials: J
authors.lastname: Yuan
authors.forename: Xiue
authors.initials: X
authors.lastname: Wang
authors.forename: Bo
authors.initials: B
authors.lastname: Zhou
authors.forename: Suling
authors.initials: S
authors.lastname: Wang
authors.forename: Shouzhong
authors.initials: S
authors.lastname: Zhang
authors.forename: Yigao
authors.initials: Y
authors.lastname: Feng
authors.forename: Baojun
authors.initials: B
authors.lastname: Yang
authors.forename: Guangxin
authors.initials: G
authors.lastname: Liu
authors.forename: Dajun
authors.initials: D
authors.lastname: Liu
authors.forename: Lili
authors.initials: L
authors.lastname: Qi
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Bernd
authors.initials: B
authors.lastname: Friebe
authors.forename: Bikram S
authors.initials: BS
authors.lastname: Gill
mesh_terms: D002871:Chromosome Banding; D032461:Chromosomes, Plant; D005670:Fusarium / Q000235:genetics / Q000472:pathogenicity*; D007113:Immunity, Innate / Q000235:genetics; D017403:In Situ Hybridization; D008540:Meiosis; D008677:Metaphase; D010935:Plant Diseases / Q000382:microbiology; D014178:Translocation, Genetic; D014908:Triticum / Q000166:cytology / Q000235:genetics* / Q000382:microbiology*