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首页> 外文期刊>Mycologia >Tall fescue is a potential spillover reservoir host for Alternaria species.
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Tall fescue is a potential spillover reservoir host for Alternaria species.

机译：高羊茅是潜在的链格孢菌溢出宿主。

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摘要

The spread of invasive species is complicated and multifaceted. Enemy spillover (i.e. the transfer of a natural enemy from a reservoir host to a novel host) is one mechanism that facilitates the spread of non-native species. The reservoir host is a species that harbors high abundance of the enemy with little cost to fitness. We asked whether Schedonorus arundinaceus (tall fescue), a highly invasive grass species in North America, is a potential reservoir host for the ubiquitous genus of fungi, Alternaria. We also asked whether spillover of Alternaria is possible among grasses that commonly occur with S. arundinaceus in grassland ecosystems. We performed a greenhouse cross inoculation of three isolates of Alternaria and six grass species (three native, three invasive, including S. arundinaceus). We determined that spillover is possible because the fungal isolates infected and caused disease symptoms on all six grasses and decreased biomass in two of the grass species. We also determined that the invasive grass species appear to be more competent hosts than the native species and that S. arundinaceus could be a likely reservoir host for Alternaria spp. because it can harbor the pathogen with no apparent fitness cost.
机译：入侵物种的扩散是复杂且多方面的。敌人外溢（即，天敌从水库宿主转移到新宿主）是促进非本地物种扩散的一种机制。水库寄主是一个拥有大量敌人而又不花很多钱就能得到的物种。我们询问了北美高侵入性草种Schedonorus arundinaceus（高羊茅）是否是无处不在的真菌链格孢属的潜在寄主。我们还询问在草地生态系统中常见与草沙门氏菌一起发生的草丛中，链格孢菌的溢出是否可能。我们对三个链格孢菌和六个草种（三种原生，三种侵入性植物，包括沙门氏菌）进行了温室交叉接种。我们确定溢出是可能的，因为真菌在所有六种草中均分离出感染的病原体并引起疾病症状，并且其中两种草的生物量减少。我们还确定，入侵草种似乎比本地草种更能胜任寄主，而S. arundinaceus可能是链格孢菌的潜在寄主。因为它可以携带病原体而没有明显的适应性成本。

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