Phenotypic Expression of Resistance to Phytophthora infestans in Processing Potatoes in Argentina
Phenotypic Expression of Resistance to Phytophthora infestans in Processing Potatoes in Argentina
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DOI：
10.1007/s12230-009-9121-z
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发表时间：
2010-04-01
影响因子：
1.5
通讯作者：
Forbes, Gregory A.
中科院分区：
文献类型：
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作者：
Andreu, Adriana B.;Caldiz, Daniel O.;Forbes, Gregory A.
在阿根廷评估了10个马铃薯品种的叶片和块茎对致病疫霉（Phytophthora infestans）的敏感性，致病疫霉是引起晚疫病的卵菌病原体。从两个主要的马铃薯生产地区在该国收集的病原体分离物的特定的毒力和同工酶带型的多态性，虽然多样性之间，而不是在特定的位置。四个品种被发现是高抗叶，有很少的疾病在田间和温室和种族特异性的电阻被怀疑。其中之一是Russet伯班克，在美国是高度易感的。品种Shepody是最敏感的，并被指定为8的值，其与疾病进展曲线下的面积值一起使用，以计算其他品种在1至9的敏感性量表上的量表值（其中9是高度敏感的）。品种Ranger Russet的抗性值约为2.5，抗性可能是小种非特异性的。其他品种的种族不亲和性似乎没有问题的易感性值在4和8之间。温室和田间叶片敏感性值相关。叶片和块茎的敏感性也相关，但有例外，只有一个品种，创新者，是高度耐块茎。在温室中选择用于评估叶片易感性的两个菌株在单独的测试中的侵略性不同，其中测量组件;然而，没有测量品种隔离的相互作用。在阿根廷，应使用具有高水平的假定小种特异性叶部抗性的品种，并进行持续监测。
Ten potato cultivars were evaluated in Argentina for foliage and tuber susceptibility to Phytophthora infestans, the oomycete pathogen causing late blight. Pathogen isolates collected from two major potato production regions in the country were polymorphic for specific virulence and isozyme banding patterns, although diversity was found among and not within specific locations. Four of the cultivars were found to be highly resistant in foliage, having little disease in the field and greenhouse and race-specific resistance is suspected. One of these is Russet Burbank, which is highly susceptible in the United States. Cultivar Shepody was the most susceptible and was assigned a value of 8, which was used together with area under disease progress curve values to calculate scale values of the other cultivars on a 1 to 9 susceptibility scale (where 9 is highly susceptible). Cultivar Ranger Russet had values of about 2.5 and resistance could be race-non-specific. The other cultivars for which race incompatibility did not appear to be a problem had susceptibility values between 4 and 8. Foliage susceptibility values for greenhouse and field were correlated. Foliage and tuber susceptibility were also correlated, although with exceptions and only one cultivar, Innovator, was highly resistant in tubers. The two isolates chosen for assessment of foliage susceptibility in the greenhouse differed for aggressiveness in separate tests where components were measured; however, no cultivar-by-isolate interaction was measured. Cultivars with high levels of putative race-specific foliage resistance should be used with constant monitoring in Argentina.