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《Molecular Plant Breeding》 2015-01
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Mapping QTLs for the Traits Related to Spike and Plant Height in Wheat

Wang Jiajia;Wang Yingying;Zhang Zhaogui;Li Bing;Zhang Guizhi;Li Sishen;State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Shandong Agricultural University;Shandong Academy of Agricultural Sciences;  
Grain number per spike is an important trait for yield in wheat. Reducing the sterility of basal spikelets is an effective solution to increase kernel number per spike. In this study, we have gained a mutant line M7652 with 2-4 basal sterile spikelets by using Ethyl methyl sulfone(EMS) to induce Shannong1186(SN1186). A backcross population of BC3F2 and BC3F2:3generation was developed from a hybrid of M7652 cross SN1186(MS),in which M7652 was used as the donor parent and SN1186 as the recurrent parent; while the F2 and F2:3generations were developed from the cross of‘M7652×TN18'(MT). The two populations were used for mapping QTL for the mutated traits. Two genetic maps were constructed with SSR(simple sequence repeat) markers that spans the target regions of 38.9 c M and 73.1 c M, respectively. In the MS population, five QTLs were detected for spike related traits and one QTL was detected for plant height in three environments. These QTLs can explain 18.22%~47.23%of the phenotypic variation. All the QTLs were mapped in the same interva1 on chromosome 4B and formed a QTL cluster. In the MT population, four QTLs were detected for spike related traits and one QTL was detected for plant height in one environment. These QTLs can explain 1.51% ~39.15% of the phenotypic variation. All the QTLs formed a QTL cluster which is similar to the MS-F2:3population. Two clusters included the swes24 marker.The loci should be related to increase kernels number of spike and to decrease the plant height. It might lay the foundation for further fine mapping and cloning of kernel number per spike and plant height.
【Fund】: 山东省现代农业产业体系资助
【CateGory Index】: S512.1
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