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首页> 外文期刊>Plant Disease >Salt marsh Claviceps purpurea in native and invaded Spartina marshes in Northern California.
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Salt marsh Claviceps purpurea in native and invaded Spartina marshes in Northern California.

机译：盐沼Claviceps purpurea在北加州原生和入侵的斯巴达纳沼泽中。

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摘要

The fungal pathogen Claviceps purpurea (subgroup G3) has a worldwide distribution on salt marsh Spartina spp. In Northern California (United States), native Spartina foliosa sustains high rates of infection by G3 C. purpurea in marshes north of the San Francisco Estuary. Invasive populations of S. alterniflora and S. alterniflora x foliosa hybrids are virtually disease free in the same estuary, although S. alterniflora is host to G3 C. purpurea in its native range (Atlantic Coast of the United States). Greenhouse inoculation experiments showed no differences in susceptibility among S. foliosa, S. alterniflora, and Spartina hybrids. Under field conditions, S. foliosa sustained a higher incidence of disease in coastal marshes than in marshes within the bay. This geographic effect may be attributable to environmental differences between the coast and the bay proper, with the former being more conducive to infection by C. purpurea. Seed set of S. foliosa spikelets was 40 to 70% lower on infected than on uninfected inflorescences, but seed germination was not affected. The C. purpurea epidemic on S. foliosa on the coast north of the San Francisco Estuary further reduces the meager competitive ability of this declining native plant species..
机译：真菌病原体紫草（Glaviceps purpurea）（亚组G3）在盐沼Spartina spp上具有全球分布。在北加利福尼亚（美国），原生叶扇贝（Spartina foliosa）在旧金山河口以北的沼泽地中受到高G3 C. purpurea的高感染率。互花米草和互花米草x叶叶杂种的入侵种群在同一河口几乎没有病害，尽管互花米草在其本地范围（美国大西洋海岸）拥有G3 C. purpurea。温室接种实验表明，叶S. alterniflora和Spartina杂种之间的敏感性没有差异。在田间条件下，叶状链球菌在沿海沼泽地中的发病率高于海湾内的沼泽地。这种地理效应可能是由于海岸和海湾之间的环境差异所致，而前者更有利于紫癜衣原体的感染。叶状链球菌小穗的种子集在感染时比未感染的花序低40％至70％，但种子发芽不受影响。旧金山河口以北海岸上的S. foliosa上的C. purpurea流行进一步降低了这种下降的本土植物物种的微薄竞争能力。

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