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首页> 外文OA文献 >Molecular Marker Mapping of Leaf Rust Resistance Gene Lr46 and Its Association with Stripe Rust Resistance Gene Yr29 in Wheat
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Molecular Marker Mapping of Leaf Rust Resistance Gene Lr46 and Its Association with Stripe Rust Resistance Gene Yr29 in Wheat

机译：小麦叶片抗锈基因Lr46的分子标记图谱及其与条纹抗锈基因Yr29的关联

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摘要

Leaf and stripe rusts, caused by Puccinia triticina and P. striiformis, respectively, are globally important fungal diseases of wheat that cause significant annual yield losses. A gene that confers slow rusting resistance to leaf rust, designated as Lr46, has recently been located on wheat chromosome 1B. The objectives of our study were to establish the precise genomic location of gene Lr46 using molecular approaches and to determine if there was an association of this locus with adult plant resistance to stripe rust. A population of 146 F5 and F6 lines produced from the cross of susceptible ‘Avocet S’ with resistant ‘Pavon 76’ was developed and classified for leaf rust and stripe rust severity for three seasons. Using patterns of segregation for the two diseases, we estimated that at least two genes with additive effects conferred resistance to leaf rust and three to four genes conferred resistance to stripe rust. Bulked segregant analysis and linkage mapping using amplified fragment length polymorphisms with the ‘Avocet’ × ‘Pavon 76’ population, F3 progeny lines of a single chromosome recombinant line population from the cross ‘Lalbahadur’ × ‘Lalbahadur (Pavon 1B)’, and the International Triticeae Mapping Initiative population established the genomic location of Lr46 at the distal end of the long arm of wheat chromosome 1B. A gene that is closely linked to Lr46 and confers moderate levels of adult plant resistance to stripe rust is identified and designated as Yr29.
机译：小麦锈菌和条纹锈菌分别引起的叶锈病和条锈病，是全球重要的小麦真菌病害，每年导致大量单产下降。赋予慢锈病抗叶锈病的基因，称为Lr46，最近位于小麦1B号染色体上。我们研究的目的是使用分子方法建立基因Lr46的精确基因组定位，并确定该基因座是否与成年植物对条锈病的抗性相关。由易感的“ Avocet S”和抗性“ Pavon 76”的杂交产生的146条F5和F6系的种群被划分为三个季节，用于区分叶锈病和条锈病的严重程度。使用两种疾病的隔离模式，我们估计至少两个具有加性效应的基因赋予了对叶锈病的抗性，而三到四个基因赋予了对条锈病的抗性。使用'Avocet'×'Pavon 76'群体，来自杂交'Lalbahadur'×'Lalbahadur（Pavon 1B）'的单染色体重组株群体的F3子代株，使用扩增的片段长度多态性进行散装分离分析和连锁作图。国际小麦制图倡议组织的种群在小麦1B染色体长臂的远端建立了Lr46的基因组位置。鉴定出与Lr46紧密相关并赋予成年植物对条锈病的中等抗性的基因，并将其命名为Yr29。

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