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Venturia orni sp. nov., a species distinct from Venturia fraxini, living in the leaves of Fraxinus ornus

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Abstract

Venturia fraxini Aderh. s.l. is an endophytic fungus in the leaves of different ash species like Fraxinus excelsior and F. ornus. This study shows that the Venturia species on F. ornus is not conspecific with V. fraxini s.s., but is a closely related species which is described as a new species: Venturia orni sp. nov. The two species distinctly differ morphologically and genetically. In contrast to V. fraxini, V. orni constantly lacks setae lining the ostiolum of the pseudothecia. In addition, the two species differ significantly and constantly in the sequences of the internal transcribed spacer (ITS) region and the genes coding for calmodulin, elongation factor EF-1α, and β-tubulin. Using the same molecular markers, another unknown endophytic Venturia species was discovered on F. ornus. However, this species never sporulated and, thus, a description of its morphology was not possible. Venturia fraxini and V. orni are host-specific and infect only F. excelsior and F. ornus, respectively, although the two hosts are sympatric at all examined sites. Venturia orni is abundant and exhibits high genetic and morphological variability, also in F. ornus planted as ornamentals outside its native range. This study indicates that Fraxinus spp. host an undiscovered wealth of fungal diversity.

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Acknowledgments

We would like to thank to Andrin Gross for his help with the phylogenetic analyses and the Genetic Diversity Center of ETH Zurich for providing laboratory facilities. This work was supported by SNF grant 31003A-146591/1 from the Swiss National Science Foundation, Bern, Switzerland.

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Authors and Affiliations

  1. Department of Environmental Systems Science, Institute of Integrative Biology, Forest Pathology and Dendrology, ETH Zurich, Universitätstrasse 16, 8092, Zurich, Switzerland

    Mohammed Ibrahim, Markus Schlegel & Thomas N. Sieber

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  1. Mohammed Ibrahim
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  2. Markus Schlegel
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  3. Thomas N. Sieber
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Correspondence to Thomas N. Sieber.

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Section Editor: Gerhard Rambold

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Ibrahim, M., Schlegel, M. & Sieber, T.N. Venturia orni sp. nov., a species distinct from Venturia fraxini, living in the leaves of Fraxinus ornus . Mycol Progress 15, 29 (2016). https://doi.org/10.1007/s11557-016-1172-1

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  • DOI: https://doi.org/10.1007/s11557-016-1172-1

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