Genetic diversity of HMW glutenin subunits in diploid,tetraploid and hexaploid <Emphasis Type="Italic">Triticum</Emphasis> species |
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| Authors: | Li-Li Xu Wei Li Yu-Ming Wei You-Liang Zheng |
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| Institution: | (1) Key Laboratory of Crop Genetic Resources and Improvement in Southwest China, Ministry of Education, Sichuan Agricultural University, Yaan, Sichuan, 625014, China;(2) Triticeae Research Institute, Sichuan Agricultural University, Dujiangyan, Sichuan, 611830, China;(3) College of Agronomy, Sichuan Agricultural University, Yaan, Sichuan, 625014, China |
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| Abstract: | The genetic variations of high-molecular-weight (HMW) glutenin subunits in 1051 accessions of 13 Triticum subspecies were investigated using sodium dodecyl sulfate polyacrylamide-gel electrophoresis. A total of 37 alleles were
detected, resulting in 117 different allele combinations, among which 20, 68 and 29 combinations were observed in diploid,
tetraploid and hexaploid wheats, respectively. Abundance and frequency of allele and combinations in tetraploid wheats were
higher than these in hexaploid wheats. Allele Glu-A1c was the most frequent subunit at Glu-A1 locus in tetraploid and hexaploid wheats. Consequently, the results also suggested that the higher variations occurred at
Glu-B1 locus compared to Glu-A1 and Glu-D1. Therefore, carthlicum wheat possessing the allele 1Ay could be presumed a special evolutional approach distinguished from other tetraploid species.
Furthermore, this provides a convenient approach of induction of the 1Ay to common wheat through direct cross with carthlicum wheat. Alleles Glu-B1c and Glu-B1i generally absent in tetraploid wheats were also found in tetraploid wheats. Our results implied that tetraploid and hexaploid
wheats were distinguished in dendrogram, whereas carthlicum and spelta wheats and however displayed the unique performance. In addition, founder effect, no-randomness of diploidization, mutation
and artificial selection could cause allele distribution of HMW-GS in Triticum. All alleles of HMW-GS in Triticum could be further utilized through hybrid in the quality improvement of common wheat. |
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| Keywords: | Genetic diversity HMW glutenin Triticum |
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