Frequency and pathogenicity distribution of Rhizoctonia spp. causing sheath blight on rice and banded leaf disease on maize in Yunnan, China
文献类型: 外文期刊
作者: Yang, G. H. 1 ; Conner, R. L. 2 ; Chen, Y. Y. 2 ; Chen, J. Y. 3 ; Wang, Y. G. 4 ;
作者机构: 1.Yunnan Agr Univ, Phytopathol Lab Yunnan Prov, Kunming 650201, Peoples R China
2.Agr & Agri Food Canada, Morden Res Stn, Unit 100 101, Morden, MB R6M 1Y, Canada
3.Yunnan Tobacco Co, Kunming 650000, Peoples R China
4.Yunnan Acad Agr Sci, Tea Res Inst, Menghai 666201, Peoples R China
关键词: rice;sheet blight;Rhizoctonia;maize;banded leaf
期刊名称:JOURNAL OF PLANT PATHOLOGY ( 影响因子:1.729; 五年影响因子:1.681 )
ISSN: 1125-4653
年卷期: 2008 年 90 卷 2 期
页码:
收录情况: SCI
摘要: Sheath blight on rice and banded leaf disease on maize are epidemic in Yunnan, China, causing severe losses of both crops. Isolates from maize sheaths showing symptoms of sheath blight, were collected from five representative counties in Yunnan. These isolates were identified as Rhizoctonia spp. based on their morphological characteristics. Four anastomosis groups (AGs) of R. solani were identified: AG-1 IA (10 isolates, 28.3% of the total), AG-1 IC (8.3%), AG-4 (11.4%) and AG-5 (11.4%). The binucleate isolates of Rhizoctonia spp. belonged to AG-A. Thirteen multinucleate isolates failed to anastomose with the AG testers of R. solani, but they possessed morphological characteristics of Rhizoctonia zeae and anastomosed with the tester isolate of anastomosis group Z of the Waitea spp. (WAG-Z). Isolates of AG-1 IA were highly pathogenic at heading stage on maize, while isolates of AG-5, AG-1 IC, and WAG-Z were considerably less pathogenic. Isolates of AG-4 and AG-A were the least pathogenic. Among the sheath samples of rice with sheath blight symptoms, forty-nine isolates from 15 counties in Yunnan were collected. They were identified as four AGs of R. solani, AG-1 IA (31 isolates, 65.3% of the total), AG-1 IB (6.1 %), AG-1 IC (6.1 %) and AG-4 (2.1 %). Binucleate isolates belonged to AG-Bb. Tested isolates of AG-1 IA, AG-Bb, and AG-4 were highly pathogenic at the heading stage on rice; isolates of AG-1 IC were moderately pathogenic, whereas isolates of AG-1 IB were non-pathogenic on rice.
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