Abstract
A new grapevine leaf rust (GLR) was found to be caused by Phakopsora montana. This new fungus naturally infects Crimson Glory vine (Vitis coignetiae), forming uredinia and telia on the leaves. Under experimental conditions, the fungus was pathogenic to table grape cultivars Delaware and Kyoho (V. × labruscana), Amur River grape (V. amurensis), and V. ficifolia, on which it produced urediniospores. Inoculation experiments proved that the pathogen alternates hosts, forming spermogonia and aecia on Meliosma tenuis. The new pathogen resembles P. meliosmae-myrianthae (=P. euvitis), a common GLR fungus; however, its spermogonial/aecial stage is restricted to M. tenuis, contrary to P. meliosmae-myrianthae with its spermogonial/aecial stage restricted to M. myriantha. Aeciospores of the new pathogen are evenly thin-walled, whereas the aeciospore wall is conspicuously thickened apically in P. meliosmae-myrianthae. Phakopsora montana is known to occur only on V. coignetiae in nature; however, table grape cultivars Delaware and Kyoho were not resistant to P. montana under experimental conditions. These results indicate that P. montana has caused a certain proportion of the GLR disease recorded in Japan with a possible mixed infection with P. meliosmae-myrianthae.
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Acknowledgments
This study was supported, in part, by a Grant-in-Aid for Scientific Research No. 18570081 from the Japan Society for the Promotion of Sciences (YO). The type material of Aecidium meliosmae-myrianthae was loaned from the mycological herbarium, Botanic Gardens and Museum Berlin Dahlem (B), for which we are grateful. SP expresses heartfelt thanks to Prof. Makoto Kakishima for his guidance in graduate studies at the University of Tsukuba. The authors declare no conflict of interests. All the experiments undertaken in this study comply with the current laws of Japan.
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Ono, Y., Chatasiri, S., Pota, S. et al. Phakopsora montana, another grapevine leaf rust pathogen in Japan. J Gen Plant Pathol 78, 338–347 (2012). https://doi.org/10.1007/s10327-012-0401-y
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DOI: https://doi.org/10.1007/s10327-012-0401-y