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| Ultrastructure and phylogeny of Ustilago coicis |
| Jing-ze Zhang, Pei-gang Guan, Gang Tao, Mohammad Reza Ojaghian, Kevin David Hyde |
| Institute of Biotechnology, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China; Guizhou Institute of Plant Protection, Guiyang 550006, China; Key Laboratory of Systematic Mycology and Lichenology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China; Institutue of Excellence in Fungal Research, School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand |
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Abstract Ustilago coicis causes serious smut on Coix lacryma-jobi in Dayang Town, Jinyun County, Zhejiang Province of China. In this paper, ultrastructural assessments on fungus-host interactions and teliospore development are presented, and molecular phylogenetic analyses have been done to elucidate the phylogenetic placement of the taxon. Hyphal growth within infected tissues was both intracellular and intercellular and on the surface of fungus-host interaction, and the fungal cell wall and the invaginated host plasma membrane were separated by a sheath comprising two distinct layers between the fungal cell wall and the invaginated host plasma membrane. Ornamentation development of teliospore walls was unique as they appeared to be originated from the exosporium. In addition, internal transcribed spacer (ITS) and large subunit (LSU) sequence data showed that U. coicis is closely related to Ustilago trichophora which infects grass species of the genus Echinochloa (Poaceae).
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Received: 06 September 2012
Published: 03 April 2013
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