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

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• 作者：Yajuan Wang ; Changyou Wang ; Wei Quan ; Xiujuan Jia ; Ying Fu ; Hong Zhang…
• 关键词：Synthetic hexaploid wheat ; Powdery mildew ; Resistance gene ; Genetic mapping ; Germplasm use
• 刊名：Euphytica
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：207
• 期：3
• 页码：619-626
• 全文大小：1,092 KB
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• 作者单位：Yajuan Wang (1)
  Changyou Wang (1)
  Wei Quan (1)
  Xiujuan Jia (1)
  Ying Fu (1)
  Hong Zhang (1)
  Xinlun Liu (1)
  Chunhuan Chen (1)
  Wanquan Ji (1)
  
  1. State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  Plant Sciences
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5060

文摘

Powdery mildew of wheat (Triticum aestivum L.) caused by Blumeria graminis f. sp. tritici, is a major fungal disease in many areas of the world. Synthetic hexaploids, created from durum wheat and Aegilops tauschii are important sources of beneficial genes for wheat improvement. Synthetic wheat ‘SE5785’ was found resistant to powdery mildew at the seedling and adult stages. Genetic analyses of the F₂ population and F_2:3 families developed from a cross of ‘SE5785’ with the susceptible common wheat, ‘Xiaoyan 22’, revealed that resistance in ‘SE5785’ was controlled by a single recessive gene. Bulked segregant analysis was used to map the powdery mildew resistance locus. The resulting genetic map comprised of markers Xcfd62, Xbarc59, PmSE5785, Xgwm539, and Xwmc817 spanned 16.3 cM. Markers Xbarc59 and Xgwm539 were tightly linked to the resistance locus at genetic distances of 3.6 and 4.0 cM, respectively. ‘Chinese Spring’ and its nulli-tetrasomic lines confirmed that PmSE5785 was located on chromosome 2D. Because no gene for powdery mildew resistance had ever been located on this chromosome in the genus Triticum, this must be a new locus, therefore, designated PmSE5785. N07228-1 and N07228-2 with large seeds and powdery mildew resistance were selected from the progeny of the cross ‘SE5785’/‘Xiaoyan 22’. These new lines can serve as sources of resistance to powdery mildew in wheat breeding. Keywords Synthetic hexaploid wheat Powdery mildew Resistance gene Genetic mapping Germplasm use