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synthetic hexaploid wheat and its utilization for wheat genetic improvement in China

Journal of Genetics and Genomics 2009年第9期36卷 539-546页

作者： Wuyun Yang Dengcai Liu Jun Li Lianquan Zhang Huiting Wei Xiaorong Hu Youliang Zheng Zhouhu He Yuchun Zou Crop Research Institute Sichuan Academy of Agricultural Science Chengdu 610066 China. Triticeae Research Institute Sichuan Agricultural University Dujiangyan city 611830 China Institute of Crop Science/National wheat Improvement Centre Chinese Academy of Agricultural Sciences (CAAS) Beijing 100081 China CIMMYT China Office clo CAAS Beijing 100081 China Northwest Plateau Institute of Biology Chinese Academy of Sciences Qinghai 810001 China

synthetic hexaploid wheat （Triticum turgidum x Aegilops tauschii） was created to explore for novel genes from T. turgidum and Ae. tauschii that can be used for common wheat improvement. In the present paper, research advances on the utilization of synthetic hexaploid wheat for wheat genetic improvement in China are reviewed. Over 200 synthetic hexaploid wheat （SHW） accessions from the International Maize and wheat Improvement Centre （CIMMYT） were introduced into China since 1995. Four cultivars derived from these, Chuanmai 38, Chuanmai 42, Chuanmai 43 and Chuanmai 47, have been released in China. Of these, Chuanmai 42, with large kernels and resistance to stripe rust, had the highest average yield （〉 6 t/ha） among all cultivars over two years in Sichuan provincial yield trials, outyielding the commercial check cultivar Chuanmai 107 by 22,7%. Meanwhile, by either artificial chromosome doubling via colchicine treatment or spontaneous chromosome doubling via a union of unreduced gametes （2n） from T. turgidum-Ae, tauschii hybrids, new SHW lines were produced in China. Mitotic-like meiosis might be the cytological mechanism of spontaneous chromosome doubling. SHW lines with genes for spontaneous chromosome doubling may be useful for producing new SHW-alien amphidiploids and double haploid in wheat genetic improvement.

关键词： Aegilops tauschii synthetic hexaploid wheat disease resistance genetic diversity wheat breeding unreduced gametes

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Genomic and genic sequence variation in synthetic hexaploid wheat (AABBDD) as compared to their parental species

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Progress in Natural Science:Materials International 2008年第5期18卷 533-538页

作者： Lihong Nie, Zongfu Han, Lahu Lu, Yingyin Yao, Qixin Sun, Zhongfu Ni Key Laboratory of Crop Heterosis and Utilization (MOE) and State Key Laboratory for Agrobiotechnology, Key Laboratory of Crop Genomics and Genetic Improvement (MOA), Beijing Key Laboratory of Crop Genetic Improvement, Department of Plant Genetics & Breeding, China Agricultural University, Beijing 100094, China Key Laboratory of Crop Heterosis and Utilization (MOE) and State Key Laboratory for Agrobiotechnology Key Laboratory of Crop Genomics and Genetic Improvement (MOA) Beijing Key Laboratory of Crop Genetic Improvement Department of Plant Genetics & Breeding China Agricultural University Beijing 100094 China

In order to understand the genomic changes during the evolution of hexaploid wheat, two sets of synthetic hexaploid wheat from hybridization between maternal tetraploid wheat (AABB) and paternal diploid goat grass (DD) were used for DNA-AFLP and single strand conformation polymorphism (SSCP) analysis to determine the genomic and genic variation in the synthetic hexaploid wheat. Results indicated that more DNA sequences from paternal diploid species were eliminated in the synthetic hexaploid wheat than from maternal tetraploid wheat, suggesting that genome from parental species of lower ploidity tends to be eliminated preferentially. However, sequence variation detected by SSCP procedure was much lower than those detected by DNA-AFLP, which indicated that much less variation in the genic regions occurred in the synthetic hexaploid wheat, and sequence variations detected by DNA-AFLP could be derived mostly from non-coding regions and repetitive sequences. Our results also indicated that sequence variation in 4 genes can be detected in hybrid F1, which suggested that this type of sequence variation could be resulted from distant hybridization. It was interesting to note that 3 out of the 4 genes were mapped and clustered on the long arm of chromosome 2D, which indicated that variation in genic sequences in synthetic hexaploid wheat might not be a randomized process.

关键词： synthetic hexaploid wheat Polyploidy Genome Sequence variation

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Quantitative trait loci analysis for root traits in synthetic hexaploid wheat under drought stress conditions

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Journal of Integrative Agriculture 2020年第8期19卷 1947-1960页

作者： LIU Rui-xuan WU Fang-kun YI Xin LIN Yu WANG Zhi-qiang LIU Shi-hang DENG Mei MA Jian WEI Yu-ming ZHENG You-liang LIU Ya-xi Triticeae Research Institute Sichuan Agricultural UniversityChengdu 611130P.R.China College of Environmental Sciences Sichuan Agricultural UniversityChengdu 611130P.R.China

synthetic hexaploid wheat(SHW),possesses numerous genes for drought that can help breeding for drought-tolerant wheat varieties.We evaluated 10 root traits at seedling stage in 111 F9 recombinant inbred lines derived from a F2 population of a SHW line(SHW-L1)and a common wheat line,under normal(NC)and polyethylene glycol-simulated drought stress conditions(DC).We mapped quantitative trait loci(QTLs)for root traits using an enriched high-density genetic map containing 120370 single nucleotide polymorphisms(SNPs),733 diversity arrays technology markers(DArT)and 119 simple sequence repeats(SSRs).With four replicates per treatment,we identified 19 QTLs for root traits under NC and DC,and 12 of them could be consistently detected with three or four replicates.Two novel QTLs for root fresh weight and root diameter under NC explained 9 and 15.7%of the phenotypic variation respectively,and six novel QTLs for root fresh weight,the ratio of root water loss,total root surface area,number of root tips,and number of root forks under DC explained 8.5–14%of the phenotypic variation.Here seven of eight novel QTLs could be consistently detected with more than three replicates.Results provide essential information for fine-mapping QTLs related to drought tolerance that will facilitate breeding drought-tolerant wheat cultivars.

关键词： synthetic hexaploid wheat quantitative trait loci drought stress root traits

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Identification of QTLs for Yield-Related Traits in the Recombinant Inbred Line Population Derived from the Cross Between a synthetic hexaploid wheat-Derived Variety Chuanmai 42 and a Chinese Elite Variety Chuannong 16

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Agricultural Sciences in China 2011年第11期10卷 1665-1680页

作者： TANG Yong-lu LI Jun WU Yuan-qi WEI Hui-ting LI Chao-SU YANG Wu-yun CHEN Fang Crop Research Institute Sichuan Academy of Agricultural Sciences Chengdu 610066 P.R.China College of Life Sciences Sichuan University Chengdu 610064 P.R.China Agronomy College Sichuan Agricultural University Ya ＇an 625014 P.R. China

synthetic hexaploid wheat （SHW） represents a valuable source of new resistances to a range of biotic and abiotic stresses. A recombinant inbred line （RIL） population with 127 recombinant inbred lines derived from a SHW-derived variety Chuanmai 42 crossing with a Chinese spring wheat variety Chuannong 16 was used to map QTLs for agronomic traits including grain yield, grains per square meter, thousand-kernel weight, spikes per square meter, grain number per spike, grains weight per spike, and biomass yield. The population was genotyped using 184 simple-sequence repeat （SSR） markers and 34 sequence-related amplified polymorphism （SRAP） markers. Of 76 QTLs （LOD〉2.5） identified, 42 were found to have a positive effect from Chuanmai 42. The QTL QGy.saas-4D.2 associated with grain yield on chromosome 4D was detected in four of the six environments and the combined analysis, and the mean yield, across six environments, of individuals carrying the Chuanmai 42 allele at this locus was 8.9% higher than that of those lines carrying the Chuannong 16 allele. Seven clusters of the yield-coincident QTLs were detected on 1A, 4A, 3B, 5B, 4D, and 7D.

关键词： yield-related traits quantitative trait loci Chuanmai 42 synthetic hexaploid wheat

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Effect of HMW-GS 6 + 8 and 1.5 + 10 from synthetic hexaploid wheat on wheat Quality Traits

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Agricultural Sciences in China 2008年第10期7卷 1161-1171页

作者： TANG Yong-lu YANG Wu-yun TIAN Ji-chun LI Jun CHEN Fang College of Life Sciences Sichuan University Chengdu 610064 P.R.China Crop Research Institute Sichuan Academy of Agricultural Sciences Chengdu 610066 P.R.China Agricultural College Shandong Agricultural University Tai＇an 250100 P.R.China

To determine the effect of 6 ＋ 8 and 1.5 ＋ 10 HMW-GS of synthetic hexaploid wheat （SHW） on main quality parameters of wheat, a set of recombinant inbred lines （RILs） derived from the cross between a SHW with N, 6 ＋ 8, 1.5 ＋ 10 HMW-GS and a cultivar Chuanyu 12-1 （CY 12-1） with 1, 7 ＋ 8, 2 ＋ 12 were planted in three environments in 2005 and 2006 and totally 16 quality parameters were tested for each line. Significant differences in all tested quality parameters but flour yield were observed between the two parents. The mean values of the RILs were intermediate to the parents for grain and protein parameters and some farinograph parameters, flour water absorption （FWA）, and farinograph softening （SOF） but beyond parents at dough stability time （DST）, breakdown time （BRT）, quality number （QN）, noodle score （NS）, and loaf volume （LOV）. All of the quality traits, especially in grain hardness （GH）, zeleny sedimentation volume （SED）, and most of farinograph parameters had significant difference between the different HMW-GS components. The effects of different alleles of HMW-GS at same locus （Glu-A1 or Glu-B1 or GIu-D1） on the different quality parameters were also different and affected by the other two loci. For most of parameters tested, 6 ＋ 8 was better than 7 ＋ 8 and there was no difference between 1.5 ＋ 10 and 2 ＋ 12. End-use quality was greatly influenced by components of HMW-GS. The components of 1, 6 ＋ 8, 1.5 ＋ 10 had the highest LOV and bread score （BS） values, whereas the components of 1, 7＋ 8 and 1.5 ＋ 10 had the highest NS values. Noodle score performed a positive linear relationship with falling number （FN） and its relationships to other quality parameters were affected by environments. Loaf volume had a significant negative relationship to SOF and positive associations with most of quality parameters. It could be concluded that HMW-GS 6＋ 8 from SHW had better overall quality characteristics than 7 ＋ 8, whereas the effects of 1.5 ＋ 10 on quality was different in respect to quality parameters and the HMW-GS c

关键词： synthetic hexaploid wheat recombinant inbred lines 6 ＋ 8 1.5 ＋ 10 HMW-GS HMW-GS component quality traits

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Genetic Analysis and Molecular Tagging a Novel Yellow Rust Resistance Gene Derived from synthetic hexaploid wheat Germplasm M08

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Agricultural Sciences in China 2008年第3期7卷 266-271页

作者： CHEN Guo-yue LI Li-hui Institute of Crop Sciences Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China Triticeae Research Institute Sichuan Agricultural University Ya＇an 625014 PR.China

Yellow rust of wheat （caused by Puccinia striiformis Westend. f. sp. tritici Eriks.） has been periodically epidemic and severely damaged wheat production in China. The development of resistant cultivars could be an effective way to reduce yield losses of wheat caused by yellow rust. Rust reaction tests and genetic analysis indicated that M08, the synthetic hexaploid wheat derived from hybridization between Triticum durum （2n = 6X = 28; genome AABB） and Aegilops tauschii （2n = 2X = 14; genome DD）, showed resistance to current prevailing yellow rust races at seedling stage, which was controlled by a single dominant gene, designated as YrAm. Bulked segregant analysis was used to identify microsatellite markers linked to gene YrAm in an F2 population derived from cross M08 （resistant） × Jinan 17 （susceptible）. Three microsatellite marker loci Xgwm77, Xgwm285, and Xgwml31 located on chromosome 3B were mapped to the YrAm locus. Xgwml31 was the closest marker locus and showed a linkage distance of 7.8 cM to the resistance locus. Thus, it is assumed that YrAm for resistance to yellow rust may be derived from Triticum durum and is located on the long arm of chromosome 3B.

关键词： yellow rust resistance gene chromosomal location microsatellite marker synthetic hexaploid wheat Triticum durum

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Application of synthetic hexaploid wheat Derived from T.Durum, Ae.taushii in Common wheat Breeding for FHB Resistance

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Journal of Northeast Agricultural University(English Edition) 2002年第2期9卷 101-105页

作者： ZHANGJu－mei SUNLian－fa 等 CropBreedingInstitute HeilongjiangAcademyofAgriculturalSciencesHarbinHeilongjiang150086PRC

The F 1 and F 4 plants of 'synthetic hexaploid wheat/common wheat'crosses and part of their parents were inoculated with Fusarium graminearum to evaluate FHB resistance.The results showed tht the scab resistance in the F 1 varied with the synthetic wheat accessions used as crossing parents.In the F 4,some resistant head lines were generated from the crosses,although their parents had different scab resistance levels.It indicated that synthetic hexaploid wheat are useful in wheat breeding for scab resistance.

关键词： common wheat breeding synthetic hexaploid wheat FHB

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Identification,mapping and use of PmSE5785,a new recessive powdery mildew resistance gene,in synthetic hexaploid wheat

Identification,mapping and use of PmSE5785,a new recessive p...

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第六届全国小麦基因组学及分子育种大会

作者： Yajuan Wang Changyou Wang Wei Quan Xiujuan Jia Ying Fu Hong Zhang Xinlun Liu Chenhuan Chen Wanquan JI State Key Laboratory of Crop Stress Biology for Arid Areas College of AgronomyNorthwest A&F University

Powdery mildew of wheat(Triticum aestivum L.),a major fungal disease in many areas of the world,is caused by Blumeria graminis f.***.tritici.synthetic hexaploid wheat is an important germplasm resource for the transfer of beneficial genes from alien species to common wheat.synthetic wheat ’SE5785’ was screened for resistance to powdery mildew during the seedling and adult stages.Genetic analyses of an F population and the F families,which were developed from a cross of ’SE5785’ and a susceptible common wheat,’Xiaoyan 22’,revealed that the powdery mildew resistance in’SE5785’ was controlled by a single recessive gene.Molecular markers and a bulked segregant analysis were used to characterize and map the powdery mildew resistance gene.A genetic map comprised Xcfd62,Xbarc59,PmSE5785,Xgwm539,and Xwmc817,spanned 16.3 cM.Xbarc59 and Xgwm539 were flanking markers tightly linked to SE5785 at genetic distances of 3.6 and 4.0 cM,respectively.’Chinese Spring’ and its corresponding nulli-tetrasomic lines were used to confirm that PmSE5785 was located on chromosome 2D.Because no gene for powdery mildew resistance derived from the genus Triticum had been located on this chromosome arm,this was apparently a newly discovered locus and was,therefore,designated PmSE5785.From the population cross of’SE5785’/’Xiaoyan 22’,we developed two new germplasm lines,N07228-1 and N07228-2,having large seeds,powdery mildew resistance,and improved agronomic traits.These new germplasm lines could serve as sources of resistance to powdery mildew in wheat breeding.

关键词： synthetic hexaploid wheat Powdery mildew Resistance gene Genetic mapping Germplasm use

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Integrating the physical and genetic map of bread wheat facilitates the detection of chromosomal rearrangements

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Journal of Integrative Agriculture 2021年第9期20卷 2333-2342页

作者： 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 Triticeae Research Institute Sichuan Agricultural UniversityChengdu 611130P.R.China Crop Research Institute Sichuan Academy of Agricultural SciencesChengdu 610066P.R.China State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China Sichuan Agricultural UniversityChengdu 611130P.R.China

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>150000 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(1 R/1 B,1 A/7 A)or a presumptive intra-chromosomal inversion(4 A).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.

关键词： Triticeae Triticum turgidum repetitive DNA sequences fluorescence in situ hybridization(FISH) wheat genome synthetic hexaploid wheat

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