Periodicity in host availability does not account for evolutionary branching as observed in many plant pathogens: an application to Gaeumannomyces graminis var. tritici.
Periodicity in host availability does not account for evolutionary branching as observed in many plant pathogens: an application to Gaeumannomyces graminis var. tritici.
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宿主可用性的周期性并不能解释许多植物病原体中观察到的进化分支：对禾本科全芽孢杆菌（Gaeumannomyces graminis var.）的应用。
DOI：
10.1094/phyto-10-09-0282
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发表时间：
2010
期刊：
影响因子：
3.2
通讯作者：
Van Den Berg F
中科院分区：
文献类型：
--
作者：
Van Den Berg F
在农业系统中，寄主可用性的周期性是常见的。虽然它是已知的植物病原体丰度有深远的影响，病原体种群的周期性的进化后果以前没有被分析。一个流行病学模型，将周期性缺乏的宿主作物相结合的适应性动力学理论，以确定是否在主机存在的季节性发挥作用的进化分支的发生，导致共存的，但遗传上不同的病原体表型。这项研究的动机和说明了小麦全蚀病的具体例子，引起的病原体禾顶囊壳变种。三孢，其中两个共存的，但遗传上不同的类型和权衡有关的季节性在主机存在已被确定。数值模拟表明，病原体的传播率和作物季节之间的病原体的生存之间的权衡不能解释在许多病原体中观察到的进化分支。模型的阐述表明，这一结论适用于广泛的推定机制。虽然分析的动机和说明的具体例子采取所有的小麦，结果适用于广泛的病原体。
Periodicity in host availability is common in agricultural systems. Although it is known to have profound effects on plant pathogen abundance, the evolutionary consequences of periodicity for the pathogen population have not previously been analyzed. An epidemiological model incorporating periodic absence of the host crop is combined with the theory of adaptive dynamics to determine whether or not seasonality in host presence plays a role in the occurrence of evolutionary branching, leading to coexisting yet genetically distinct pathogen phenotypes. The study is motivated and illustrated by the specific example of take-all disease of wheat, caused by the pathogenGaeumannomyces graminisvar.tritici, for which two coexisting but genetically distinct types and a trade-off related to seasonality in host presence have been identified. Numerical simulations are used to show that a trade-off between the pathogen transmission rate and the survival of the pathogen between cropping seasons cannot account for the evolutionary branching observed in many pathogens. Model elaborations show that this conclusion holds for a broad range of putative mechanisms. Although the analysis is motivated and illustrated by the specific example of take-all of wheat, the results apply to a broad range of pathogens.
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