Karyotypic similarity identifies multiple host-shifts of a pathogenic fungus in natural populations.
Karyotypic similarity identifies multiple host-shifts of a pathogenic fungus in natural populations.
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核型相似性识别自然群体中病原真菌的多次宿主转移。
DOI：
10.1016/s1567-1348(02)00154-5
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Heishman,Hilary
中科院分区：
文献类型：
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作者：
Hood,MichaelE;Antonovics,Janis;Heishman,Hilary
早期宿主转移的检测对突发疾病的研究很重要，因为它允许检查有利于新的物种间传播的生态和遗传条件。研究了黑穗病病原菌紫罗兰病菌（Microbotryum violaceum）在黑穗病常见寄主latifolia和罕见寄主vulgaris之间发生寄主转移的可能性。对混合和纯寄主群体的真菌样品进行了电泳核型变异研究。核型距离矩阵显示真菌样品按地区聚集，但不按寄主种类聚集。在许多病例中，普通葡萄的真菌样品与同域真菌样品难以区分。研究结果表明，至少有两个独立的宿主转移，一个在美国，可能还有两个在意大利。核型和生态数据表明，寄主迁移的方向是由大叶桑向普通桑转移。
The detection of incipient host-shifts is important to the study of emergent diseases because it allows the examination of ecological and genetic conditions that favor novel inter-species transmission. Mixed populations of Silene latifolia and Silene vulgaris were investigated for the putative occurrence of host-shifts by the fungal plant pathogen Microbotryum violaceum (the cause of anther-smut disease) between S. latifolia (a common host for the pathogen) and S. vulgaris (a rare host). Samples of the fungus from mixed and pure host populations were studied for variation in their electrophoretic karyotypes. A karyotype distance matrix showed that fungal samples clustered by locality, but not by host species. Fungal samples from S. vulgaris were indistinguishable from sympatric samples from S. latifolia in multiple cases. The results indicated at least two independent host-shifts, one in the US and perhaps two in Italy. The karyotype and ecological data indicate that the direction of the host-shifts is from S. latifolia to S. vulgaris.