Morphological and molecular characterization of two ITS groups of <Emphasis Type="Italic">Erysiphe</Emphasis> (Erysiphales) occurring on <Emphasis Type="Italic">Syringa</Emphasis> and <Emphasis Type="Italic">Ligustrum</Emphasis> (Oleaceae) |
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Authors: | Yusuke Seko Vasyl Heluta Banga Grigaliunaite Susumu Takamatsu |
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Institution: | (1) Graduate School of Bioresources, Mie University, 1577 Kurima-Machiya, Tsu 514-8507, Japan;(2) Institute of Botany of the National Academy of Sciences of Ukraine, 2 Tereshchenkivska St., Kiev, 01601, Ukraine;(3) Institute of Botany of the Nature Research Centre, 8406 Vilnius, Lithuania; |
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Abstract: | ITS sequences determined for 53 Erysiphe specimens on Syringa and Ligustrum collected in Europe, East Asia, and North and South America were divided into two ITS groups, S and K types. Phylogenetic
analysis showed that these two ITS types do not share a common ancestor and form separate clades. The K type on Ligustrum was identified as Erysiphe ligustri based on the three-dimensional branching pattern of appendages. Morphological observations showed that there are some morphological
differences—pigmentation of appendages and number of ascospores per ascus—between the S and K types on Syringa. Based on these morphological observations, the S and K types on Syringa were identified as E. syringae and E. syringae-japonicae, respectively. The recent abundant production of chasmothecia by lilac powdery mildew in Europe was caused by E. syringae-japonicae introduced from East Asia. DNA sequence analyses of the rDNA ITS region and the 28S rDNA, tub2, CYP51, and Chs1 genes did not support an interspecific hybrid origin for E. syringae-japonicae. Haplotype analysis suggested that E. syringae originated in North America and independently migrated to East Asia and Europe/South America. |
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Keywords: | Erysiphaceae Geographic origin |
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