Identification and genetic mapping of a powdery mildew resistance gene in wild emmer (Triticum dicoccoides) accession IW72 from Israel

Xiaoling Ji, Chaojie Xie, Zhongfu Ni, Tsomin Yang, Eviatar Nevo, Tzion Fahima, Zhiyong Liu, Qixin Sun

Research output: Contribution to journalArticlepeer-review


Powdery mildew, caused by Blumeria graminis f. sp. tritici (Bgt), is a devastating disease of wheat (Triticum aestivum) in China and worldwide, causing severe yield losses annually. Wild emmer (T. dicoccoides) accession IW72 collected from Israel is resistant to powdery mildew at the seedling and adult stages. Genetic analysis indicated that the resistance was controlled by a single dominant gene, temporarily designated MlIW72. The F2 population and F3 families derived from a hybrid between IW72 and susceptible durum wheat line Mo75 were used for molecular mapping of the resistance gene. MlIW72 was linked with SSR loci Xgwm344, Xcfa2040, Xcfa2240, Xcfa2257 and Xwmc525 on the long arm of chromosome 7A. In addition, two STS markers, MAG2185 (derived from RFLP marker PSR680) and MAG1759 (developed from EST CD452874), were mapped close to MlIW72. All these markers were physically located in the terminal bin 0.86-1.00 of 7AL. The chromosome location and genetic mapping results suggested that the powdery mildew resistance gene identified in wild emmer accession IW72 might be a new allele at the Pm1 locus or a new locus closely linked to Pm1.

Original languageEnglish
Pages (from-to)385-390
Number of pages6
Issue number3
StatePublished - Feb 2008

Bibliographical note

Funding Information:
Acknowledgements The authors thank Dr. Robert McIntosh for his comprehensive review of this manuscript. This work was Wnancially supported by the National Natural Science Foundation of China (30571151), National Fund for Distinguished Young Scholars (30425039), State High-Tech Programs (2006AA100102, 2006AA10Z1C4, 2006AA10Z1E9) Fok Ying Tung Education Foundation (94021), and Beijing Natural Science Foundation (6061003).


  • Genetic mapping
  • Powdery mildew
  • Resistance gene
  • Triticum dicoccoides
  • Wild emmer

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Genetics
  • Plant Science
  • Horticulture


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