PCR markers for selection of adult plant leaf rust resistance in barley (Hordeum vulgare L.) |
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Authors: | Liu Fenglou Gupta Sanjiv Zhang Xiao-Qi Jones Michael Loughman Robert Lance Reg Li Chengdao |
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Institution: | (1) College of Agronomy, Northwest A&F University, No. 3 Taicheng Road, 712100 Yangling, Shaanxi, People’s Republic of China;(2) State Agricultural Biotechnology Center, Murdoch University, Perth, WA, 6150, Australia;(3) Department of Agriculture and Food, Western Australia, 3 Baron-Hay Court, South Perth, WA, 6151, Australia; |
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Abstract: | Adult plant resistance (APR) is considered potentially more durable for controlling barley leaf rust than seedling Rph (Resistance to Puccinia hordei) genes. A major gene for adult plant resistance to barley leaf rust has been mapped to the telomere region of chromosome
5HS. PCR-based molecular markers were developed for saturation of this region based on previously mapped simple sequence repeat,
restriction fragment length polymorphism and Diversity Arrays Technology markers. In addition, defence gene homologue (DGH)
and wheat expressed sequence tags mapped in specific bins were used to develop new PCR markers. Seventeen PCR-based markers
were mapped to the short arm of chromosome 5H in 292 doubled haploid lines from a cross of Pompadour × Stirling, in which
seven markers were mapped within 5 cM of the APR gene. The closest linked marker was about 0.7 cM from the APR gene. The wheat
deletion bin map together with defence gene homologues was demonstrated to be an efficient tool for development of new molecular
markers associated with the disease resistance gene. Four DGH markers were associated with the APR gene. The new molecular
markers are a useful tool for marker-assisted selection of the APR gene and provided a better understanding of the molecular
mechanism for leaf rust resistance. |
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