QTL Mapping for Important Agronomic Traits in Synthetic Hexaploid Wheat Derived from Aegiliops tauschii ssp. tauschii |
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| Authors: | 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 |
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| Affiliation: | 1、Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, P.R.China
2、School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, P.R.China
3、Agronomy College, Sichuan Agricultural University, Chengdu 611130, P.R.China
4、CSIRO Plant Industry, St Lucia, QLD 4067, Australia |
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| Abstract: | 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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| Keywords: | genetic map QTL DArT agronomic traits synthetic wheat Aegilops tauschii ssp tauschii |
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