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Integrating the physical and genetic map of bread wheat facilitates the detection of chromosomal rearrangements
ZHAO Lai-bin, XIE Die, HUANG Lei, ZHANG Shu-jie, LUO Jiang-tao, JIANG Bo, NING Shun-zong, ZHANG Lian-quan, YUAN Zhong-wei, WANG Ji-rui, ZHENG You-liang, LIU Deng-cai, HAO Ming
2021, 20 (9): 2333-2342.   DOI: 10.1016/S2095-3119(20)63289-0
Abstract118)      PDF in ScienceDirect      
The bread wheat genome harbors a high content of repetitive DNA, which is amenable to detection and characterization using fluorescence in situ hybridization (FISH) karyotyping.  An integrated genetic map was derived from a recombinant inbred population bred from a cross between a synthetic hexaploid wheat and a commercial Chinese bread wheat cultivar, based on 28 variable FISH sites and >150 000 single nucleotide polymorphism (SNP) loci.  The majority (20/28) of the variable FISH sites were physically located within a chromosomal region consistent with the genetic location inferred from that of their co-segregating SNP loci.  The eight exceptions reflected the presence of either a translocation (1R/1B, 1A/7A) or a presumptive intra-chromosomal inversion (4A).  For eight out of the nine FISH sites detected on the Chinese Spring (CS) karyotype, there was a good match with the reference genome sequence, indicating that the most recent assembly has dealt well with the problem of placing tandem repeats.  The integrated genetic map produced for wheat is informative as to the location of blocks of tandemly repeated DNA and can aid in improving the quality of the genome sequence assembly in regions surrounding these blocks.
 
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QTL Mapping for Important Agronomic Traits in Synthetic Hexaploid Wheat Derived from Aegiliops tauschii ssp. tauschii
YU Ma, CHEN Guo-yue, ZHANG Lian-quan, LIU Ya-xi, LIU Deng-cai, WANG Ji-rui, PU Zhien, ZHANG Li, LAN Xiu-jin, WEI Yu-ming, LIU Chun-ji , ZHENG You-liang
2014, 13 (8): 1835-1844.   DOI: 10.1016/S2095-3119(13)60655-3
Abstract1444)      PDF in ScienceDirect      
Aegiliops tauschii is classified into two subspecies: Ae. tauschii ssp. tauschii and Ae. tauschii ssp. strangulata. Novel genetic variations exist in Ae. tauschii ssp. tauschii that can be utilized in wheat improvement. We synthesized a hexaploid wheat genotype (SHW-L1) by crossing an Ae. tauschii ssp. tauschii accession (AS60) with a tetraploid wheat genotype (AS2255). A population consisting of 171 F8 recombinant inbred lines was developed from SHW-L1 and Chuanmai 32 to identify QTLs associated with agronomic traits. A new genetic map with high density was constructed and used to detect the QTLs for heading date, kernel width, spike length, spikelet number, and thousand kernel weight. A total of 30 putative QTLs were identified for five investigated traits. Thirteen QTLs were located on D genomes of SHW-L1, six of them showed positive effect on agronomic traits. Chromosome region flanked by wPt-6133–wPt-8134 on 2D carried five environment-independent QTLs. Each QTL accounted for more than 10% phenotypic variance. These QTLs were highly consistent across environments and should be used in wheat breeding.
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