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禾谷镰孢菌对多菌灵的敏感性基线及抗药性菌株生物学性质研究
引用本文:周明国,王建新.禾谷镰孢菌对多菌灵的敏感性基线及抗药性菌株生物学性质研究[J].植物病理学报,2001,31(4):365-370.
作者姓名:周明国  王建新
作者单位:南京农业大学植保学院, 南京 210095
基金项目:国家“九五”科技攻关项目(96-005-01-07);江苏省“九五”科技攻关项目(BE99312);高等学校骨干教师资助计划
摘    要: 引起小麦赤霉病的禾谷镰孢菌(Fusarium graminearum)在华东地区对多菌灵已出现了高水平抗药性。本文报道了F.graminearum对多菌灵的敏感性基线及其抗药性菌株生物学特性。离体条件下多菌灵对100个野生敏感型菌株的平均EC50和MIC值分别为0.5748±0.0133 μg/ml和 < 1.4μg/ml。而对50个抗药性菌株的平均EC50和MIC值则分别为9.2375μg/ml和 > 100 μg/ml。在麦穗上多菌灵对50个敏感菌株和抗药性菌株防效的平均EC50分别为282.6 μg/ml和 > 2 000μg/ml。从田间获得的抗多菌灵菌株对苯菌灵、噻菌灵、甲基托布津表现交互抗药性,但不同于室内突变菌株,对乙霉威不表现负交互抗药性。抗药性菌株的无性和有性繁殖后代以及在无药培养基上菌丝体转代培养后,抗药水平保持不变。抗药性菌株的菌丝生长速率、产孢能力及致病力等与敏感菌株相比没有差异。

关 键 词:小麦赤霉病  禾谷镰孢菌  多菌灵  抗药性  生物学特性  
文章编号:0412-0914(2001)04-0365-06
修稿时间:2000年5月29日

STUDY ON SENSITIVITY BASE-LINE OF Fusarium graminearum TO CARBENDAZIM AND BIOLOGICAL CHARACTERS OF MBC-RESISTANT STRAINS
ZHOU Ming guo,WANG Jian xin.STUDY ON SENSITIVITY BASE-LINE OF Fusarium graminearum TO CARBENDAZIM AND BIOLOGICAL CHARACTERS OF MBC-RESISTANT STRAINS[J].Acta Phytopathologica Sinica,2001,31(4):365-370.
Authors:ZHOU Ming guo  WANG Jian xin
Institution:College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China
Abstract:Resistance to carbendazim (MBC) has seriously developed in Fusarium grami nearum, which causes wheat scab in East of China. This paper presented the sensitivity base line of the pathogen to MBC-fungicide and the biological character of the MBC resistant isolates. EC50 and MIC values of carbendazim inhibiting mycelium growth of 100 wild-type isolates were 0.5748±0.0133 μg/ml and less than 1.4 μg/ml in average, and those of 50 resistant isolates were 9.2375 μg/ml and more than 100 μg/ml, respectively in vitro. Average EC50 of the fungicide controlling wheat scab was 282.6 μg/ml and more than 2 000 μg/ml on the detached ears which were respectively inoculated with 50 sensitive and resistant isolates. MBC-resistant isolates showed positive cross resistance to benomyl, thiabendazole, thiophanate-methyl, but no negative cross-resistance to diethofencarb, which differed from lab resistant mutants. Resistance of F. graminearum to carbendazim is heritable through asexual and sexual cycles. No difference was found between the resistant and sensitive strains in the rate of mycelial linear growth, sporulation and pathogenicity.
Keywords:Wheat scab  Fusarium graminearum  carbendazim  fungicide resistance  biological character
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