Genetic effect of locus B2 inhibiting awning in double-ditelosomic 6B of Triticum durum DR147

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• 作者：Hao Li ; Yanchao Han ; Xiaoxue Guo ; Fei Xue…
• 关键词：Awning inhibitor ; Double ditelosomic ; Genetic similarity ; Microsatellite marker ; Partial dominance ; Triticum durum
• 刊名：Genetic Resources and Crop Evolution
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：62
• 期：3
• 页码：407-418
• 全文大小：3,339 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Plant Physiology
  Plant Pathology
  
• 出版者：Springer Netherlands
• ISSN：1573-5109

文摘

Plentiful awn variations have been discovered in hexaploid wheats, while less were observed in diploid and tetraploid wheats. However, a double ditelosomic line of 6B (dDT6B) in tetraploid wheat cultivar DR147 specifically displayed awnless phenotype, which arised from the presence of awning inhibitor B2 located in telosome 6BL derived from hexaploid wheat cultivar Chinese Spring (CS). B2 locus was definitely proved to be essential for the awnless phenotype and the partial dominance effect of B2 locus was thus indicated. Furthermore, employing microsatellite markers, the CS genetic background of telosome 6BL and 6BS of dDT6B proved to be distinctly and partially retained in dDT6B, indicated by a genetic similarities coefficient 0.542 with CS. According to the genetic and physical map of chromosome 6B, B2 locus was anchored to a region between 6BL-5 and the distal boundary of 6BL-6’s interstitial deletion, adjacent to three markers-em class="a-plus-plus">Xwmc539, Xgpw5130 and Xwmc748. Inspired by recalcitrant retention after 16 generations-backcross with tetraploid wheat, B2 locus was demonstrated to be located in recombination coldspots of telosome 6BL, which was the proximal region of Xwmc748 to centromere.