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首页> 外文期刊>Plant Disease >Variation for resistance to Verticillium wilt in lettuce (Lactuca sativa L.).
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Variation for resistance to Verticillium wilt in lettuce (Lactuca sativa L.).

机译：莴苣（Lactuca sativa L.）对黄萎病的抗性变化。

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摘要

Host resistance offers the most cost-effective method of Verticillium wilt control in lettuce (Lactuca sativa). In 2004 and 2005, 107 and 22 lettuce cultivars, respectively, were screened for resistance in a field infested with Verticillium dahliae, and disease progress on resistant and susceptible cultivars was determined. Greenhouse experiments were conducted to evaluate 16 cultivars for resistance to a race 1 and a race 2 isolate. Significant differences for resistance were observed within cultivated lettuce. In susceptible cultivars, disease levels increased through the season, whereas disease in resistant cultivars remained constant. Resistance in greenhouse tests was dependant upon the race used. Seven cultivars were resistant to race 1, whereas all were susceptible to race 2. Cultivar reactions to race 1 in greenhouse and field experiments were correlated, indicating the utility of greenhouse evaluations. The identification of resistance in diverse lettuce types is beneficial to the breeding process. However, because of the existence of resistance-breaking race 2 isolates, this resistance may not be durable. Alternatively, targeted releases of race-1-resistant cultivars to fields with only race 1 pathogen genotypes may extend the life of these cultivars..
机译：寄主抗性是控制莴苣黄萎病最经济有效的方法。在2004年和2005年，分别在大黄萎病菌侵染的田间筛选了107个和22个生菜品种的抗病性，并确定了抗病和易感品种的病害进展。进行温室实验以评估16个品种对第1种和第2种分离株的抗性。在栽培的莴苣中观察到抗性的显着差异。在易感品种中，疾病水平随季节增加，而抗性品种中的疾病保持恒定。温室试验中的抗性取决于所使用的种族。七个品种对第1种具有抗性，而所有品种均对第2种具有抗性。温室和田间试验对第1种的品种反应相关，表明温室评估的实用性。鉴定各种生菜类型中的抗性有助于育种过程。但是，由于存在抗性破坏环2隔离株，因此这种抗性可能不是持久的。或者，将具有种族1抗性的品种定向释放到只有种族1病原体基因型的田地中可以延长这些品种的寿命。

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