QTL mapping of adult-plant resistance to leaf rust in a RIL population derived from a cross of wheat cultivars Shanghai 3/Catbird and Naxos
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Six QTL for adult plant resistance to leaf rust, including two QTL effective against additional diseases, were identified in a RIL population derived from a cross between Shanghai 3/Catbird and Naxos.
Leaf rust is an important wheat disease and utilization of adult-plant resistance (APR) may be the best approach to achieve long-term protection from the disease. The CIMMYT spring wheat line Shanghai 3/Catbird (SHA3/CBRD) showed a high level of APR to Chinese Puccinia triticina pathotypes in the field. To identify APR genes in this line, a mapping population of 164 recombinant inbred lines (RILs) was developed from a cross of this line and Naxos, a moderately susceptible German cultivar. The RILs were evaluated for final disease severity (FDS) at Baoding, Hebei province, and Zhoukou, Henan province, in the 2010–2011 and 2011–2012 cropping seasons. QTL analysis detected one major QTL derived from SHA3/CBRD on chromosome 2BS explaining from 15 to 37 % of the phenotypic variance across environments. In addition one minor resistance QTL on chromosome 1AL from SHA3/CBRD and four minor QTL from Naxos on chromosomes 2DL, 5B, 7BS, and 7DS were also detected. SHA3/CBRD also possessed seedling resistance gene Lr26, and Naxos contained Lr1 based on gene postulation following tests with an array of P. triticina pathotypes and molecular marker assays. These seedling resistance and APR genes and their closely linked molecular markers are potentially useful for improving leaf rust resistance in wheat breeding programs.
KeywordsPowdery Mildew Simple Sequence Repeat Marker Leaf Rust Stripe Rust Leaf Rust Resistance
We are grateful to the critical review of this manuscript by Prof. R. A. McIntosh, Plant Breeding Institute, University of Sydney, Australia. The project was supported by National Natural Science Foundation of China (31361140367 and 31300562), the National Key Basic Research Program of China (2013CB127700), International Science & Technology Cooperation Program of China, the China Agriculture Research System (CARS-3-1-3), the Key Project of Hebei Applied Foundation Research Plan (11960145D), and the scientific research team of Baoding University (KYTD2013001).
Conflict of interest
The authors declare that there are no conflicts of interest in the reported research.
The authors note that this research is performed and reported in accordance with ethical standards of the scientifc conduct.
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