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Population structure of Venturia inaequalis a causal agent of apple scab in response to heterogeneous apple tree cultivation

机译:苹果黑星病的病原体Venturia inaequalis的种群结构对苹果树异种栽培的响应

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摘要

BackgroundTracking newly emergent virulent populations in agroecosystems provides an opportunity to increase our understanding of the co-evolution dynamics of pathogens and their hosts. On the one hand host plants exert selective pressure on pathogen populations, thus dividing them into subpopulations of different virulence, while on the other hand they create an opportunity for secondary contact between the two divergent populations on one tree. The main objectives of the study were to explore whether the previously reported structure between two Venturia inaequalis population types, virulent or avirulent towards Malus x domestica cultivars carrying Rvi6 gene, is maintained or broken several years after the first emergence of new virulent strains in Poland, and to investigate the relationship between ‘new’ and ‘native’ populations derived from the same commercial orchards. For this purpose, we investigated the genetic structure of populations of the apple scab fungus, occurring on apple tree cultivars containing Rvi6, Rvi1 or Rvi17 resistance gene or no resistance at all, based on microsatellite data obtained from 606 strains sampled in 10 orchards composed of various host cultivars.
机译:背景跟踪对农业生态系统中新出现的有毒力种群提供了一个机会,可以增进我们对病原体及其宿主共同进化动态的了解。一方面,寄主植物对病原体种群施加选择性压力,从而将其划分为不同毒力的亚群,另一方面,它们为一棵树上两个不同种群之间的次生接触创造了机会。这项研究的主要目的是探讨在波兰首次出现新的毒力株数年后,是否维持或破坏了先前报道的两种对不携带携带Vvi6基因的苹果属(Malus x domestica)毒力或无毒力金星不等种群类型的结构,并研究来自相同商业果园的“新”和“本地”种群之间的关系。为此,我们基于从10个果园组成的10个果园中采样的606个菌株获得的微卫星数据,研究了苹果sc真菌种群的遗传结构,该种群出现在含有Rvi6,Rvi1或Rvi17抗性基因或根本没有抗性的苹果树上。各种寄主品种。

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