title: Genetic rearrangements of six wheat-agropyron cristatum 6P addition lines revealed by molecular markers.
abstract: Agropyron cristatum (L.) Gaertn. (2n = 4x = 28, PPPP) not only is cultivated as pasture fodder but also could provide many desirable genes for wheat improvement. It is critical to obtain common wheat-A. cristatum alien disomic addition lines to locate the desired genes on the P genome chromosomes. Comparative analysis of the homoeologous relationships between the P genome chromosome and wheat genome chromosomes is a key step in transferring different desirable genes into common wheat and producing the desired alien translocation line while compensating for the loss of wheat chromatin. In this study, six common wheat-A. cristatum disomic addition lines were produced and analyzed by phenotypic examination, genomic in situ hybridization (GISH), SSR markers from the ABD genomes and STS markers from the P genome. Comparative maps, six in total, were generated and demonstrated that all six addition lines belonged to homoeologous group 6. However, chromosome 6P had undergone obvious rearrangements in different addition lines compared with the wheat chromosome, indicating that to obtain a genetic compensating alien translocation line, one should recombine alien chromosomal regions with homoeologous wheat chromosomes. Indeed, these addition lines were classified into four types based on the comparative mapping: 6PI, 6PII, 6PIII, and 6PIV. The different types of chromosome 6P possessed different desirable genes. For example, the 6PI type, containing three addition lines, carried genes conferring high numbers of kernels per spike and resistance to powdery mildew, important traits for wheat improvement. These results may prove valuable for promoting the development of conventional chromosome engineering techniques toward molecular chromosome engineering.
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement (NKCRI), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Haiming
authors.initials: H
authors.lastname: Han
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement (NKCRI), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Li
authors.initials: L
authors.lastname: Bai
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement (NKCRI), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Junji
authors.initials: J
authors.lastname: Su
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement (NKCRI), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Jinpeng
authors.initials: J
authors.lastname: Zhang
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement (NKCRI), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Liqiang
authors.initials: L
authors.lastname: Song
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement (NKCRI), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Ainong
authors.initials: A
authors.lastname: Gao
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement (NKCRI), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Xinming
authors.initials: X
authors.lastname: Yang
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement (NKCRI), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Xiuquan
authors.initials: X
authors.lastname: Li
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement (NKCRI), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Weihua
authors.initials: W
authors.lastname: Liu
authors.affiliation: National Key Facility for Crop Gene Resources and Genetic Improvement (NKCRI), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Lihui
authors.initials: L
authors.lastname: Li
mesh_terms: D031702:Agropyron / Q000235:genetics*; D032461:Chromosomes, Plant / Q000235:genetics*; D003433:Crosses, Genetic; D018745:Genome, Plant; D006824:Hybridization, Genetic; D017403:In Situ Hybridization; D014178:Translocation, Genetic; D014908:Triticum / Q000235:genetics*