文章基本信息

标题：The viability of a breeding programme for ash in the British Isles in the face of ash dieback
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作者：William J. Plumb ; Timothy L. R. Coker ; Jonathan J. Stocks 等
期刊名称：PLANTS, PEOPLE, PLANET
电子版ISSN：2572-2611
出版年度：2020
卷号：2
期号：1
页码：29-40
DOI：10.1002/ppp3.10060
摘要：To evaluate the viability and feasibility of a future breeding programme to produce trees resistant to an emerging pest or pathogen, it is helpful to ask the following questions: How much variation in resistance exists in tree populations? To what extent is this resistance heritable? How many genetic loci are involved? What level of resistance is found in other species of the same genus? Here, we survey current knowledge of these issues in relation to the degree of resistance of European ash ( Fraxinus excelsior ) to H . fraxineus , the fungus causing ash dieback (ADB). Several studies have found a low frequency of heritable resistance in F. excelsior populations, which seems to be determined by many genetic loci. This suggests that a breeding programme is viable and that natural selection may also increase the mean resistance of populations over time. More research is needed on the genetic basis of resistance to ADB to understand how quickly natural selection can operate in woodlands and what acceleration may be possible in breeding programmes, including via use of genetic markers. Hybrid breeding programmes may also be a possibility, as some ash species appear to be more resistant to ADB than is F. excelsior , but more research is needed on this issue. We do not yet know if it will be possible to breed F. excelsior to have resistance to both ADB and the emerging threat of emerald ash borer. We recommend short‐term mitigation measures for the ADB epidemic and future research directions.
关键词：Agrilus planipennis;ash dieback;breeding;evolution;Fraxinus;Hymenoscyphus fraxineus;natural selection