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| The small and large subunits of carbamoyl-phosphate synthase exhibit diverse contributions to pathogenicity in Xanthomonas citri subsp. citri |
| Guo Jing, SonG Xue, Zou Li-fang, Zou Hua-song, CHen Gong-you |
| School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, P.R.China |
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摘要 Carbamoyl-phosphate synthase plays a vital role in the carbon and nitrogen metabolism cycles. In Xanthomonas citri subsp. citri, carA and carB encode the small and large subunits of carbamoyl-phosphate synthase, respectively. The deletion mutation of the coding regions revealed that carA did not affect any of the phenotypes, while carB played multiple roles in pathogenicity. The deletion of carB rendered the loss of pathogenicity in host plants and the ability to induce a hypersensitive reaction in the non-hosts. Quantitative reverse transcription-PCR assays indicated that 11 hrp genes coding the type III secretion system were suppressed when interacting with citrus plants. The mutation in carB also affected bacterial utilization of several carbon and nitrogen resources in minimal medium MMX and extracellular enzyme activities. These data demonstrated that only the large subunit of carbamoyl-phosphate synthase was essential for canker development by X. citri subsp. citri.
Abstract Carbamoyl-phosphate synthase plays a vital role in the carbon and nitrogen metabolism cycles. In Xanthomonas citri subsp. citri, carA and carB encode the small and large subunits of carbamoyl-phosphate synthase, respectively. The deletion mutation of the coding regions revealed that carA did not affect any of the phenotypes, while carB played multiple roles in pathogenicity. The deletion of carB rendered the loss of pathogenicity in host plants and the ability to induce a hypersensitive reaction in the non-hosts. Quantitative reverse transcription-PCR assays indicated that 11 hrp genes coding the type III secretion system were suppressed when interacting with citrus plants. The mutation in carB also affected bacterial utilization of several carbon and nitrogen resources in minimal medium MMX and extracellular enzyme activities. These data demonstrated that only the large subunit of carbamoyl-phosphate synthase was essential for canker development by X. citri subsp. citri.
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Received: 21 July 2014
Accepted:
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| Fund: This work was supported by the National Natural Science Foundation of China (31171832) and the Special Fund for Agro-Scientific Research in the Public Interest, China (201003067). |
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Corresponding Authors:
ZOU Hua-song, Tel: +86-21-34205873,E-mail: hszou@sjtu.edu.cn; CHEN Gong-you, Tel: +86-21-34205873, E-mail: gyouchen@sjtu.edu.cn
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Cite this article:
Guo Jing, SonG Xue, Zou Li-fang, Zou Hua-song, CHen Gong-you.
2015.
The small and large subunits of carbamoyl-phosphate synthase exhibit diverse contributions to pathogenicity in Xanthomonas citri subsp. citri. Journal of Integrative Agriculture, 14(7): 1338-1347.
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