首页分享 Barberry as Alternate Host Is Important for Puccinia graminis f. sp tritici But Not for Puccinia striiformis f. sp tritici in the US Pacific Northwest

Barberry as Alternate Host Is Important for Puccinia graminis f. sp tritici But Not for Puccinia striiformis f. sp tritici in the US Pacific Northwest

来源：花匠小妙招时间：2025-09-17 14:16

摘要

Common barberry (Berberis vulgaris) is the alternate host of the wheat stem rust pathogen, Puccinia graminis f. sp. tritici, under natural conditions in the U.S. Pacific Northwest. Barberry was recently shown to be infected by basidiospores of the wheat stripe rust pathogen, Puccinia striifonnis f. sp. tritici, under controlled conditions, but it is unclear if barberry plays any role in stripe rust epidemics under natural conditions. Aecial samples of Puccinia spp. collected from barberry plants in the Pacific Northwest from 2010 to 2013 were characterized to species by inoculation on wheat plants under controlled conditions and by molecular markers and sequences of the internal transcribed spacer (ITS) region of nuclear ribosomal DNA. Inoculation of wheat plants with bulked aecia-bearing barberry samples resulted in most P. graminis f. sp. tritici media and some P. striifonnis f. sp.tritici uredinia. Virulence tests demonstrated that the P. graminis f. sp. tritici isolates were sexually produced, whereas the P. striifonnis f. sp. tritici isolates were clonal based on both virulence and simple sequence repeat marker tests, indicating urediniospores from wheat fields landing on barberry leaves as the possible source of P. striiformis f. sp. tritici inoculum. A method for simultaneously testing individual aecia for identifying of P. granzinis f. sp. tritici and P. striifonnis f. sp. tritici by pathogenicity and ITS markers. Using the method together with ITS sequencing, tested individual aecia were mostly P. graminis f. sp. tritici and occasionally some other formae speciales of P. graminis, but not P. striifonnis. The results imply that barberry is essential for stem rust epidemics, but not for stripe rust under the natural conditions in the U.S. Pacific Northwest.展开▼

机译：普通伏牛（小er）是小麦茎锈病病原体Puccinia graminis f的替代宿主。 sp。 Tritici，在自然条件下在美国太平洋西北地区。最近显示，伏牛花被小麦条锈病病原体Puccinia striifonnis f。的担子孢子感染。 sp。小麦在受控条件下生长，但尚不清楚伏牛花是否在自然条件下的条纹锈病流行中发挥任何作用。普希尼亚（Puccinia spp。）通过在受控条件下接种小麦植物，并通过核糖体DNA内部转录间隔区（ITS）的分子标记和序列，对2010年至2013年从西北太平洋的伏牛花植物中收集的物种进行分类。用膨大的带有刺槐的伏牛花样品接种小麦植株会导致大多数P. graminis f。 sp。 Tritici media和一些P. striifonnis f。小麦链霉菌毒力测试表明，P。graminis f。 sp。小麦分离株是有性产生的，而P. striifonnis f。 sp。基于毒力和简单的序列重复标记测试，对小麦的分离株均是克隆的，表明小麦田中的抗孢子孢子着陆于伏牛花叶上，可能是条锈菌的来源。 sp。黑麦接种物。一种同时测试个体的aecia以鉴定P. granzinis f。的方法。 sp。 Tritici和P.striifonnis f。 sp。小麦的致病性和ITS标记。使用该方法和ITS测序，被测个体的aeea多数为P. graminis f。 sp。小麦，偶尔还有一些其他的P. graminis形态科，但不是P. striifonnis。结果表明伏牛花对于茎锈病的流行是必不可少的，但对于美国西北太平洋地区的自然条件下的条锈病却不是。展开▼

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