Citron C-05 inhibits both the penetration and colonization of Xanthomonas citri subsp. citri to achieve resistance to citrus canker disease
| Autor: | Meijun Wang, Fu Hongyan, Xianfeng Ma, Limei Tan, Ziniu Deng, Han Jian, Mingming Zhao, Dazhi Li, Jing Xu, Shunyuan Xiao |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
0301 basic medicine Virulence Plant Science Orange (colour) Horticulture Biology 01 natural sciences Biochemistry Article Plant breeding Xanthomonas citri Microbiology 03 medical and health sciences food Ponkan Genetics Biotic Bacterial disease Inoculation food and beverages food.food Citrus medica 030104 developmental biology Citrus canker 010606 plant biology & botany Biotechnology |
| Zdroj: | Horticulture Research |
| ISSN: | 2052-7276 2662-6810 |
| DOI: | 10.1038/s41438-020-0278-4 |
| Popis: | Citrus canker, caused by Xanthomonas citri subsp. citri (Xcc), is a serious bacterial disease that affects citrus production worldwide. Citron C-05 (Citrus medica) is the only germplasm in the Citrus genus that has been identified to exhibit strong resistance to Xcc. However, it has not been determined when, where, and how Xcc is restricted in the tissues of Citron C-05 during the infection process. In the present study, we investigated the spatiotemporal growth dynamics of an eGFP-labeled virulent Xcc (eGFP-Xcc) strain in Citron C-05 along with five susceptible biotypes (i.e., lemon, pummelo, sour orange, sweet orange, and ponkan mandarin) upon inoculation via the spraying or leaf infiltration of a bacterial suspension. The results from extensive confocal laser scanning microscopy analyses showed that while Xcc grew rapidly in plants of all five susceptible genotypes, Xcc was severely restricted in the epidermal and mesophyll cell layers of the leaves of Citron C-05 in the early stage of infection. Not surprisingly, resistance against Xcc in Citron C-05 was found to be associated with the production of reactive oxygen species and hypersensitive response-like cell death, as well as greater upregulation of several defense-related genes, including a pathogenesis-related gene (PR1) and a glutathione S-transferase gene (GST1), compared with sweet orange as a susceptible control. Taken together, our results not only provide further valuable details of the spatiotemporal dynamics of the host entry, propagation, and spread of Xcc in both resistant and susceptible citrus plants but also suggest that resistance to Xcc in Citron C-05 may be attributed to the activation of multiple defense mechanisms. |
| Databáze: | OpenAIRE |
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