| 3份木薯新种质抗细菌性萎蔫病机理初探 |
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| 引用本文： | 林兆威,李超萍,蔡吉苗,时涛,黄贵修.3份木薯新种质抗细菌性萎蔫病机理初探[J].热带作物学报,2021,42(1):205-212. |
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| 作者姓名： | 林兆威 李超萍 蔡吉苗 时涛 黄贵修 |
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| 作者单位： | 中国热带农业科学院环境与植物保护研究所/农业农村部热带作物有害生物综合治理重点实验室/海南省热带农业有害生物监测与控制重点实验室,海南海口 571101 |
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| 基金项目： | 国家重点研发计划项目(No.2018YFD0201100);国家现代木薯产业技术体系病害防控岗(No.CARS-12-hnhgx);农业农村部现代农业人才支撑计划项目(No.0316001)。 |
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| 摘 要： | 木薯细菌性萎蔫病（cassava bacterial blight, CBB）是当前国内木薯生产上最为严重的病害。为了明确抗细菌性萎蔫病木薯种质的抗病机理,本研究比较木薯抗感种质叶片的自身组织结构,与木薯细菌性萎蔫病菌（Xanthomonas axonopodis pv. manihotis, Xam）互作过程中组织结构和生理生化物质变化的差异。结果发现,在叶片自身组织结构上,抗病种质叶片单位面积气孔开口总面积、表面蜡质含量及角质层厚度显著高于感病种质;受Xam侵染后,抗病种质叶片病/健处产生木栓质积累和形成部分侵填体结构,且产生的胼胝质比感病种质多,过氧化物酶（POD）、苯丙氨酸解氨酶（PAL）和多酚氧化酶（PPO）活性及H2O2含量显著高于感病种质。表明3份抗病新种质的抗病性与叶片单位面积气孔开口总面积、表面蜡质含量、角质层厚度以及Xam侵染所诱导的木栓质、侵填体、胼胝质、防御酶活性、H2O2含量有关。
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| 关 键 词： | 木薯 细菌性萎蔫病 抗病种质 抗病机理 |
| 收稿时间： | 2019-12-02 |
Resistant Mechanism to Bacterial Blight of Three New Cassava Germplasms |
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| LIN Zhaowei,LI Chaoping,CAI Jimiao,SHI Tao,HUANG Guixiu.Resistant Mechanism to Bacterial Blight of Three New Cassava Germplasms[J].Chinese Journal of Tropical Crops,2021,42(1):205-212. |
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| Authors: | LIN Zhaowei LI Chaoping CAI Jimiao SHI Tao HUANG Guixiu |
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| Institution: | Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences / Key Laboratory of Integrated Pest Management on Tropical Crops, Ministry of Agriculture & Rural Afairs / Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests, Haikou, Hainan 571101, China |
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| Abstract: | Cassava bacterial blight(CBB)is the most serious disease in the cassava plantations of China.In order to clarify the resistance mechanism of cassava germplasms to bacterial blight,this study compared the structure of the leaves of the resistant and susceptible germplasms,and the tissue structure,physiological and biochemical substances changes during interaction with Xanthomonas axonopodis pv.manihotis.Results showed that the total area of stomatal opening,surface waxy matter content,and keratinization thickness were significantly higher in the resistant germplasms than those in the susceptible germplasms.When the cassava plants were infected with X.axonopodis pv.manihotis,the microstructure observation showed that the resistant cassava germplasms could produce more callose than the sensitive germplasms,the cork accumulated and partial tylosis structure was also formed at the infection sites of the resistant germplasms,and the activity of POD,PAL,PPO and the content of H2O2 in the leaves of the resistant cassava germplasms were significantly higher than those of the susceptible germplasms,which showed that the resistance of the three new cassava germplasms was related to the total area of stomatal opening,surface waxy matter content,keratinization thickness,and cork accumulated,partial tylosis structure,callose,the activity of defense enzyme,the content of H2O2. |
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| Keywords: | cassava bacterial blight disease resistance germplasm resistance mechanism |
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