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Lactuca georgica, a new wild source of resistance to downy mildew: comparative study to other wild lettuce relatives
European Journal of Plant Pathology ( IF 1.8 ) Pub Date : 2021-03-02 , DOI: 10.1007/s10658-021-02228-5
Alex Beharav

Seedlings of 431 accessions representing six and five Armenian natural populations of the wild Lactuca georgica and L. altaica, respectively, and 32, 23, and 20 populations of L. saligna, L. serriola, and L. aculeata, respectively (mostly Israeli natural populations), were screened at seedling stage for resistance to six highly virulent races of Bremia lactucae - the causal of lettuce downy mildew - that were found on several widely grown cultivars and represent the virulence spectrum in the main lettuce production areas in Europe and California. This study is likely the first detailed screening of resistance to B. lactucae races in natural populations of L. georgica and L. altaica. The highest average resistance probability and frequency of highly resistant accessions across races were detected in L. georgica. These were even higher than those shown by the germplasm of known non-host resistance (NHR) species L. saligna, which classified to the secondary lettuce gene pool (LGP-2). Thus, we suggest that L. georgica is a new LGP-2 source of resistance to B. lactucae. Our findings also support previous observations that L. aculeata, a species within the LGP-1, should be prioritized as a source of downy mildew resistance in domesticated lettuce (L. sativa) breeding programs, since some L. aculeata accessions expressed highly resistance across races. For L. serriola, the closest relative of cultivated lettuce, and for L. altaica, also a closer or even a primitive form of L. sativa, probabilities of resistance to each of the investigated B. lactucae races were very low.



中文翻译:

佐治草(Lactuca georgica),一种新的野生霜霉病抗性来源:与其他野生生菜亲缘种的比较研究

代表6 431个种质和野生五个亚美尼亚自然种群幼苗莴苣georgicaL.阿尔泰分别,和32,23,20人口的L.柳桉L. serriolaL. aculeata分别为(主要是以色列自然),在苗期筛选了对六个高毒种Bremia lactucae的抗性-莴苣霜霉病的病因-在多个广泛种植的品种中发现,代表欧洲和加利福尼亚主要莴苣产区的毒力谱。这项研究可能是首次对自然种群中对乳酸杆菌的抗性进行详细筛选。L. georgicaL. altaica。乔治亚州的各个种族中,最高的平均抗性发生率和高抗性种质发生的频率。这些甚至比已知的非寄主抗性(NHR)s。saligna种的种质更高,后者被分类为次级生菜基因库(LGP-2)。因此,我们认为,佐治亚乳杆菌是一种新的对乳酸双歧杆菌有抗性的LGP-2来源。我们的发现还支持以前的观察,即在一些莴苣(L. sativa)育种计划中,LGP-1中的一种种L. aculeata应该优先作为霜霉病抗性的来源,因为有些短小L.aculeata的种质在各个种族之间都表现出很高的抗性。对于栽培莴苣的最接近亲缘种L. serriola,以及同样接近或什至原始形式的L. sativa的L. altaica,对每个被调查的B. lactucae小种都有抗性的可能性非常低。

更新日期:2021-03-02
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