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Special Issue:
线虫合辑Nematology
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| Study on burrowing nematode, Radopholus similis, pathogenicity test system in tobacco as host |
YANG Si-hua1*, ZHAO Li-rong2*, DING Sha3, TANG Shi-qiao1, CHEN Chun1, ZHANG Huan-xin1, XU Chun-ling1, XIE Hui1
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1 Research Center of Nematodes of Plant Quarantine, Laboratory of Plant Nematology, College of Plant Protection, South China Agricultural University, Guangzhou 510642, P.R.China
2 Technology Center, Guangzhou Customs District, People's Republic of China, Guangzhou 510623, P.R.China
3 Comprehensive Technology and Service Center of Huizhou Port Customs, Huizhou 516080, P.R.China
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摘要
本研究通过室内试管石英砂培养的方法，测试香蕉穿孔线虫对本氏烟草的侵染致病过程和规律，明确了香蕉穿孔线虫侵染本氏烟草根系主要在根系皮层寄生，导致皮层细胞分解、组织腐烂。通过采用不同致病型和不同寄主来源的香蕉穿孔线虫群体对本氏烟草侵染致病的接种条件进行测定，以及对发病植株的症状表现、受害严重度和线虫繁殖率等致病性相关因子的评估，确定了香蕉穿孔线虫与本氏烟草互作研究的最佳测试条件和结果评估标准，从而建立了本氏烟草作为寄主的香蕉穿孔线虫致病性测定方法：（1）在玻璃培养试管中装入约占高度1/3 干燥的石英砂并灭菌两次；（2）将20天苗龄的本氏烟草幼苗移栽到试管中，在25±1℃条件下培养定植10 天；（3）以150条/株的接种虫量将香蕉穿孔线虫的雌虫接种到烟草根际；（4）在接种线虫30天后检测植株发病严重度、生长量和线虫繁殖量。本研究还采用该方法对致病型和寄主来源不同的8个香蕉穿孔线虫种群的致病性强弱进行了测定，证明了该方法的可行性。本研究结果为将本氏烟草作为香蕉穿孔线虫与植物互作研究的模式植物提供了依据和方法，为香蕉穿孔线虫致病性及其与寄主互作分子机制研究提供了新途径，对利用本氏烟草作为模式寄主研究香蕉穿孔线虫的致病机制和防治方法具有重要意义。
Abstract
Radopholus similis (Cobb 1893) Thorne (1949) is a destructive migratory endoparasitic plant nematode. In this study, the pathogenic process of R. similis infection in Nicotiana benthamiana (tobacco) was studied using quartz sand culture in laboratory. The results showed that R. similis mainly parasitised the root cortex, leading to cortical cell decomposition and tissue decay. We optimised the inoculation conditions to establish a method for determining the pathogenicity of R. similis as follows: (1) a glass culture tube was filled with quartz sand (about 1/3 of the height) and sterilised twice; (2) 20-day-old N. benthamiana seedlings were transplanted into test tubes and cultivated for 10 days at (25±1)°C; (3) R. similis female nematodes were inoculated in the root rhizosphere at a rate of 150 nematodes per plant; (4) the number of nematodes, disease severity, and growth of the plant at 30 days post-inoculation (dpi) were determined. The pathogenicity of eight R. similis populations from different hosts was determined, which proved the feasibility of this method.
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Received: 11 October 2021
Accepted: 17 November 2021
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| Fund:
This work was supported by the Natural Science Foundation of Guangdong Province, China (2021A1515011273) and the National Natural Science Foundation of China (31071665).
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| About author: Received 11 October, 2021 Accepted 17 November, 2021
Correspondence XIE Hui, E-mail: xiehui@scau.edu.cn; XU Chun-ling, E-mail: xuchunling@scau.edu.cn
* These authors contributed equally to this study. |
Cite this article:
YANG Si-hua, ZHAO Li-rong, DING Sha, TANG Shi-qiao, CHEN Chun, ZHANG Huan-xin, XU Chun-ling, XIE Hui.
2022.
Study on burrowing nematode, Radopholus similis, pathogenicity test system in tobacco as host. Journal of Integrative Agriculture, 21(9): 2652-2664.
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