Cultivated lentil suffers yield loss from stemphylium blight, caused by Stemphylium botryosum Wallr. Identification of sources of stemphylium blight resistance and knowledge of the mode of inheritance of resistance are important for developing resistant cultivars. The interspecific recombinant inbred line (RIL) population developed from a cross between the moderately resistant parent Lens culinaris cv. ‘Eston’ and the resistant parent L. ervoides (Brign.) Grande accession IG 72815 was evaluated for stemphylium blight resistance under controlled conditions at the University of Saskatchewan, Saskatoon, Canada, and under field conditions at the Pulses Research Centre (PRC), Ishurdi, Bangladesh. We hypothesized that resistance from both parents will lead to transgressive segregation indicative of pyramiding of resistance genes from the same. However, no resistant transgressive segregants were observed in the RIL population. A large proportion (50%) of the RILs had disease severity levels similar to the resistant parent IG 72815 in experiments conducted under natural disease pressure in Bangladesh. Under controlled conditions in Saskatoon, 38% of RILs had resistance levels similar to IG 72815. Across all environments, 14 RILs consistently had resistance levels similar to IG 72815. The distribution of disease severity scores for all RILs indicated polygenic inheritance of stemphylium blight resistance in the population. RILs with consistent resistant reactions should prove useful for lentil improvement programmes. This will contribute to increasing the productivity of lentil crops in North America and the Indo-Gangetic region, which account for more than 68% of world lentil production.

中文翻译：

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种间重组近交系的抗茎枯病抗性评估

栽培的扁豆因茎枯病而导致产量损失，这是由葡萄干沃尔。鉴定茎枯病抗性来源和了解抗性遗传模式对于开发抗性栽培品种很重要。种间重组自交系 (RIL) 群体由中等抗性亲本之间的杂交发展而来烹饪透镜简历。“爱斯顿”和抗拒的父母L. ervoides(Brign.) 在加拿大萨斯卡通的萨斯喀彻温大学和孟加拉伊舒尔迪的脉冲研究中心 (PRC) 的田间条件下，对 Grande 加入 IG 72815 的茎叶枯病抗性进行了评估。我们假设来自父母双方的抗性将导致越界分离，表明来自同一父母的抗性基因的金字塔。然而，在 RIL 群体中没有观察到抗性海侵分离子。在孟加拉国的自然疾病压力下进行的实验中，很大一部分（50%）的 RIL 的疾病严重程度与抗性亲本 IG 72815 相似。在萨斯卡通的受控条件下，38% 的 RIL 的电阻水平与 IG 72815 相似。在所有环境中，14 个 RIL 的电阻水平始终与 IG 72815 相似。所有 RIL 的疾病严重程度评分分布表明人群中茎枯病抗性的多基因遗传。具有一致抗性反应的 RIL 应该证明对小扁豆改良计划有用。这将有助于提高北美和印度恒河地区小扁豆作物的产量，这些地区占世界小扁豆产量的 68% 以上。