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咯菌腈羧酸衍生物内吸传导性及对香蕉枯萎病的防效测定
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引用本文:吴瀚翔,陈志彬,肖春霞,赖多,姚光凯,徐汉虹.咯菌腈羧酸衍生物内吸传导性及对香蕉枯萎病的防效测定.植物保护学报,2021,48(4):789-797
DOI:10.13802/j.cnki.zwbhxb.2021.2021009
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吴瀚翔 华南农业大学, 亚热带农业生物资源保护与利用国家重点实验室, 天然农药与化学生物学教育部重点实验室, 广州 510642  
陈志彬 华南农业大学, 亚热带农业生物资源保护与利用国家重点实验室, 天然农药与化学生物学教育部重点实验室, 广州 510642  
肖春霞 华南农业大学, 亚热带农业生物资源保护与利用国家重点实验室, 天然农药与化学生物学教育部重点实验室, 广州 510642  
赖多 广东省农业科学院果树研究所, 广东省热带亚热带果树研究重点实验室, 农业农村部南亚热带果树生物学与遗传资源利用重点实验室, 广州 510640  
姚光凯 华南农业大学, 亚热带农业生物资源保护与利用国家重点实验室, 天然农药与化学生物学教育部重点实验室, 广州 510642 gkyao@scau.edu.cn, 
徐汉虹 华南农业大学, 亚热带农业生物资源保护与利用国家重点实验室, 天然农药与化学生物学教育部重点实验室, 广州 510642 hhxu@scau.edu.cn 
中文摘要:为研发用于防治香蕉枯萎病的维管组织导向杀菌剂,基于植物韧皮部“离子井”效应对非内吸杀菌剂咯菌腈进行弱酸化结构修饰,在蓖麻模型上完成韧皮部输导性筛选和机制验证,通过盆栽试验研究咯菌腈羧酸衍生物在香蕉植株上的输导分布,并测定衍生物对香蕉枯萎病的防效。结果表明:羧酸基团引入使咯菌腈衍生物在蓖麻幼苗上表现出韧皮部输导性,证明存在pH依赖的“离子井”效应机制;盆栽试验结果显示,衍生物1a在被叶片吸收后能向下传递到香蕉植株球茎和根部,并能够降解释放出咯菌腈,对香蕉枯萎病的防效为54.5%,显著高于咯菌腈原药处理组的防效6.5%。表明基于韧皮部“离子井”效应的结构修饰是香蕉维管组织导向杀菌剂研发的有效途径。
中文关键词:化学防治  尖孢镰刀菌  导向农药  韧皮部  输导性
 
Systemicity of fludioxonil derivatives with a carboxylic acid function and their control effect against Fusarium wilt of banana
Author NameAffiliationE-mail
Wu Hanxiang State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources
Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education South China Agricultural University, Guangzhou 510642, Guangdong Province, China 
 
Chen Zhibin State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources
Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education South China Agricultural University, Guangzhou 510642, Guangdong Province, China 
 
Xiao Chunxia State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources
Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education South China Agricultural University, Guangzhou 510642, Guangdong Province, China 
 
Lai Duo Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization, Ministry of Agriculture and Rural Affairs Guangdong Provincial Key Laboratory of Tropical and Subtropical Fruit Tree Research, Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, Guangdong Province, China  
Yao Guangkai State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources
Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education South China Agricultural University, Guangzhou 510642, Guangdong Province, China 
gkyao@scau.edu.cn, 
Xu Hanhong State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources
Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education South China Agricultural University, Guangzhou 510642, Guangdong Province, China 
hhxu@scau.edu.cn 
Abstract:In order to develop vascular-guided fungicides against Fusarium wilt of banana, non-systemic fungicide fludioxonil was modified by adding a carboxylic acid group based on ion-trap mechanism of plant phloem. The phloem mobility and loading mechanisms of the obtained acidic derivatives were studied on the caster bean model. Pot experiments were performed to evaluate the long-distance translocation of the selected derivative and its efficacy against banana Fusarium wilt. The results showed that the introduction of carboxylic acid group conferred phloem mobility to non-systemic fludioxonil in caster bean seedlings, and the pH-dependent ion-trap mechanism was involved in the phloem loading process. In pot experiments, acidic derivative 1a could be translocated to the rhizomes and roots of banana plants after foliar application, and fludioxonil was observed to be released in rhizomes and roots of 1atreated banana plants. The efficacy of derivative 1a against banana Fusarium wilt in vivo was 54.5%, which was significantly higher than that of fludioxonil (6.5%). The results suggested that chemical modification according to the ion-trap mechanism was a feasible approach to developing banana vascular-guided fungicides.
keywords:chemical control  Fusarium oxysporum  guided pesticide  phloem  translocation
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