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首页> 外文期刊>Plant Pathology >Displacement of US-1 clonal lineage by a new lineage of Phytophthora infestans on potato in Kenya and Uganda
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Displacement of US-1 clonal lineage by a new lineage of Phytophthora infestans on potato in Kenya and Uganda

机译：肯尼亚和乌干达马铃薯上的疫病疫霉新谱系取代US-1克隆谱系

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摘要

Phytophthora infestans, the pathogen responsible for causing late blight in potato and tomato, is a rapidly evolving and highly adaptable pathogen. Following the appearance of a new clonal genotype in Kenya (KE-1 lineage) in 2007, there was a need to document possible displacement of the US-1 genotype by the newer lineage. Samples from Kenya (260) collected on potato and from Uganda collected on potato (134) and tomato (32) were genotyped with simple sequence repeat (SSR) and mitochondrial DNA haplotype (mtDNA) markers. Results show that, four years after its discovery, the KE-1 lineage has completely displaced the US-1 lineage on potato in Kenya. The KE-1 lineage has also migrated into Uganda through the eastern part of the country that borders western Kenya. All potato samples from eastern Uganda were of the KE-1 lineage. Moreover, samples from eight fields in western Uganda were also of the KE-1 lineage, which is in agreement with an ongoing westward displacement. However, the new lineage has not displaced the old lineage on tomato, as all samples from tomato were US-1. Principal coordinate analysis (PCA) scatter plots revealed clustering that indicated separation between the lineages and also between the subpopulations of the US-1 lineage on potato and tomato.
机译：致病疫霉是导致马铃薯和番茄晚疫病的病原体，是一种迅速发展且高度适应的病原体。在2007年肯尼亚出现一种新的克隆基因型（KE-1谱系）之后，有必要记录新谱系可能取代US-1基因型。用简单重复序列（SSR）和线粒体DNA单倍型（mtDNA）标记对来自肯尼亚（260个）和马铃薯（134个）和番茄（32个）的乌干达进行基因分型。结果表明，KE-1谱系被发现四年后，已经完全取代了肯尼亚马铃薯上的US-1谱系。 KE-1谱系也已通过与肯尼亚西部接壤的该国东部迁移到乌干达。来自乌干达东部的所有马铃薯样品均为KE-1血统。而且，来自乌干达西部八个油田的样品也属于KE-1谱系，这与正在进行的向西移动相符。但是，新谱系并未取代番茄上的旧谱系，因为所有番茄样品均为US-1。主坐标分析（PCA）散点图显示，聚类表明谱系之间以及US-1谱系亚群在马铃薯和番茄上的分离。

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