文献类型： 外文期刊

作者： Fan, J. ¹ ; Guo, X. -Y. ¹ ; Huang, F. ³ ; Li, Y. ¹ ; Liu, Y. -F. ⁴ ; Li, L. ¹ ; Xu, Y. -J. ¹ ; Zhao, J. -Q. ¹ ; Xiong, H. ² ; Y ¹ ;

作者机构： 1.Sichuan Agr Univ, Rice Res Inst, Chengdu 611130, Peoples R China

2.Sichuan Acad Agr Sci, Rice & Sorghum Res Inst, Luzhou 646100, Peoples R China

3.Sichuan Agr Univ, Dept Plant Pathol, Coll Agron, Chengdu 611130, Peoples R China

4.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing 210014, Peoples R China

关键词： Arabidopsis;epiphytism;green fluorescent protein;rice false smut;Ustilaginoidea virens;weeds

期刊名称：PLANT PATHOLOGY （ 影响因子：2.59； 五年影响因子：2.924 ）

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收录情况： SCI

摘要： Ustilaginoidea virens (Uv), the causative agent of rice false smut disease, infects developing rice spikelets at the booting stage, and transforms individual grains of the panicle into smut balls. Epidemics of the disease occur when the rice booting and heading stages coincide with rainy days. Using a green fluorescent protein (GFP)-labelled Uv isolate that can form false smut balls on rice panicles, it was found that under high humidity and free water conditions the Uv isolate could colonize leaves of plants belonging to various families including the Poaceae (Oryza sativa, Echinochloa crusgalli, Digitaria sanguinalis and Leptochloa chinensis), the Brassicaceae (Arabidopsis thaliana) and the Solanaceae {Nicotiana bentbami-ana) without symptoms. Over several days, some conidia could germinate on the leaves of these plants and in water on the surface of Parafilm and cellophane, form hyphae and differentiate conidiophores to generate a large number of secondary conidia, while other conidia were able to directly produce secondary conidia. Conversely, in the absence of water some conidia could either bud to form new conidia or were converted into chlamydospores. These data indicate that Uv is one of a few fungal pathogens reported to have epiphytic characteristics. The rapid generation of a large number of spores on biotic and abiotic surfaces greatly increases the inoculum that can infect rice spikelets, resulting in the occurrence of rice false smut disease epidemics. These findings are important in the development of disease control strategies.