Choi Young-Joon, Shin Hyeon-Dong, Thines Marco
Division of Environmental Science and Ecological Engineering, College of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Republic of Korea.
Mycol Res. 2009 Dec;113(Pt 12):1340-50. doi: 10.1016/j.mycres.2009.08.010. Epub 2009 Aug 20.
Recently, downy mildew of Salvia species became economically relevant globally, but the taxonomy of the causal agent remains still obscure. The objective of this study was to characterize and distinguish the different Peronospora species associated with downy mildew on sages, based on morphological and molecular data. For this purpose we compared Peronospora specimens on Salvia officinalis and Salvia plebeia with Peronospora swinglei, including the type specimen on Salvia reflexa. We observed that three Peronospora species are associated with downy mildew on sages, and the recent outbreak of the disease on S. officinalis and S. plebeia is associated with two undescribed species, contrasting the view that either P. swinglei or Peronospora lamii is the causal agent of the downy mildew disease as claimed previously by several studies. In the study presented here, we provide the formal descriptions and illustrations for the two newly introduced taxa, Peronospora salviae-plebeiae and Peronospora salviae-officinalis. The three species of Peronospora investigated seem to be restricted to specific species of Salvia: P. swinglei to S. reflexa, P. salviae-plebeiae to S. plebeia, and P. salviae-officinalis to S. officinalis. Speciation may be allopatric and closely linked to the geographic distributions of their host plants.
最近，鼠尾草属植物的霜霉病在全球范围内具有经济重要性，但致病病原体的分类仍不明确。本研究的目的是基于形态学和分子数据，对与鼠尾草霜霉病相关的不同霜霉属物种进行特征描述和区分。为此，我们将药用鼠尾草和荔枝草上的霜霉属标本与斯温格霜霉进行了比较，包括返顾鼠尾草上的模式标本。我们观察到三种霜霉属物种与鼠尾草的霜霉病有关，最近在药用鼠尾草和荔枝草上爆发的这种病害与两个未描述的物种有关，这与之前一些研究声称斯温格霜霉或拉米霜霉是霜霉病病原体的观点形成了对比。在本研究中，我们提供了两个新引入分类单元——荔枝草霜霉和药用鼠尾草霜霉的正式描述和图示。所研究的三种霜霉属物种似乎局限于特定的鼠尾草属物种：斯温格霜霉局限于返顾鼠尾草，荔枝草霜霉局限于荔枝草，药用鼠尾草霜霉局限于药用鼠尾草。物种形成可能是异域性的，并且与它们寄主植物的地理分布密切相关。
