Sensitivity to silthiofam, tebuconazole and difenoconazole of Gaeumannomyces graminis var. tritici isolates from China.
Sensitivity to silthiofam, tebuconazole and difenoconazole of Gaeumannomyces graminis var. tritici isolates from China.
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DOI：
10.1002/ps.3277
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发表时间：
2012-08
影响因子：
4.1
通讯作者：
Yingzi Yun;Fangwei Yu;Ning Wang;Huai-Gu Chen;Y. Yin;Zhonghua Ma
中科院分区：
文献类型：
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作者：
Yingzi Yun;Fangwei Yu;Ning Wang;Huai-Gu Chen;Y. Yin;Zhonghua Ma
背景技术 小麦全蚀是由全麦酵母（Gaeumannomyces graminis var. var.）引起的。小麦（Ggt）在过去几年中已成为小麦生产的新威胁。 Silthiofam对Ggt非常有效，最近在中国已广泛用于控制通吃。然而，农民注意到这种化合物在一些麦田中的防治效果下降，这表明该病原体可能已经对硅硫菌产生了抗性。结果从中国不同地点收集的66株Ggt分离株中，27株对硅硫菌耐药。硅硫菌灵与特库康唑或苯醚甲环唑之间不存在交叉耐药性。对于接种了硅硫菌抗性菌株的小麦，硅硫菌控制全食的有效性受到影响。根据微卫星 PCR 生成的 DNA 指纹图谱，在这些分离株中发现了两个主要遗传簇，并且与硅硫磷的敏感性明显相关。结论 Silthiofam 在 Ggt 中产生耐药性的风险很高。戊唑醇和苯醚甲环唑在控制小麦全食方面显示出巨大的潜力。这项研究的结果为全面控制和杀菌剂抗性管理提供了有用的信息。
BACKGROUND Wheat take-all caused by Gaeumannomyces graminis var. tritici (Ggt) has become an emerging threat to wheat production in the last few years. Silthiofam is very effective against Ggt, and recently it has been widely used for the control of take-all in China. However, farmers have noted a decline in control efficacy with this compound in some wheat fields, suggesting that the pathogen may have developed resistance to silthiofam. RESULTS Of the 66 Ggt isolates collected from different locations in China, 27 were resistant to silthiofam. There was no cross-resistance between silthiofam and tecuconazole or difenoconazole. The effectiveness of silthiofam in controlling take-all was compromised on wheat inoculated with silthiofam-resistant isolates. Based on the DNA fingerprinting generated by microsatellite PCR, two predominant genetic clusters were found among these isolates and were clearly associated with the sensitivity to silthiofam. CONCLUSION Silthiofam has a high risk in the development of resistance in Ggt. Tebuconazole and difenoconazole show great potential for control of take-all on wheat. Results from this study provide useful information for take-all control and the management of fungicide resistance.