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Article

Ectopic Expression of Executor Gene Xa23 Enhances Resistance to Both Bacterial and Fungal Diseases in Rice

by
Zhiyuan Ji
†,
Hongda Sun
†,
Yena Wei
,
Man Li
,
Hongjie Wang
,
Jiangmin Xu
,
Cailin Lei
,
Chunlian Wang
* and
Kaijun Zhao
*
National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI), Institute of Crop Sciences, Chinese Academy of Agriculture Sciences (CAAS), Beijing 100081, China
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Int. J. Mol. Sci. 2022, 23(12), 6545; https://doi.org/10.3390/ijms23126545
Submission received: 25 April 2022 / Revised: 1 June 2022 / Accepted: 9 June 2022 / Published: 11 June 2022
(This article belongs to the Section Molecular Plant Sciences)
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Abstract

Bacterial blight (BB) and bacterial leaf streak (BLS), caused by phytopathogenic bacteria Xanthomonas oryzae pv. oryzae (Xoo) and Xanthomonas oryzae pv. oryzicola (Xoc), respectively, are the most serious bacterial diseases of rice, while blast, caused by Magnaporthe oryzae (M. oryzae), is the most devastating fungal disease in rice. Generating broad-spectrum resistance to these diseases is one of the key approaches for the sustainable production of rice. Executor (E) genes are a unique type of plant resistance (R) genes, which can specifically trap transcription activator-like effectors (TALEs) of pathogens and trigger an intense defense reaction characterized by a hypersensitive response in the host. This strong resistance is a result of programed cell death induced by the E gene expression that is only activated upon the binding of a TALE to the effector-binding element (EBE) located in the E gene promoter during the pathogen infection. Our previous studies revealed that the E gene Xa23 has the broadest and highest resistance to BB. To investigate whether the Xa23-mediated resistance is efficient against Xanthomonas oryzae pv. oryzicola (Xoc), the causal agent of BLS, we generated a new version of Xa23, designated as Xa23p1.0, to specifically trap the conserved TALEs from multiple Xoc strains. The results showed that the Xa23p1.0 confers broad resistance against both BB and BLS in rice. Moreover, our further experiment on the Xa23p1.0 transgenic plants firstly demonstrated that the E-gene-mediated defensive reaction is also effective against M. oryzae, the causal agent of the most devastating fungal disease in rice. Our current work provides a new strategy to exploit the full potential of the E-gene-mediated disease resistance in rice.
Keywords: rice; executor gene; Xanthomonas oryzae; Magnaporthe oryzae; transcription activator-like effectors rice; executor gene; Xanthomonas oryzae; Magnaporthe oryzae; transcription activator-like effectors

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MDPI and ACS Style

Ji, Z.; Sun, H.; Wei, Y.; Li, M.; Wang, H.; Xu, J.; Lei, C.; Wang, C.; Zhao, K. Ectopic Expression of Executor Gene Xa23 Enhances Resistance to Both Bacterial and Fungal Diseases in Rice. Int. J. Mol. Sci. 2022, 23, 6545. https://doi.org/10.3390/ijms23126545

AMA Style

Ji Z, Sun H, Wei Y, Li M, Wang H, Xu J, Lei C, Wang C, Zhao K. Ectopic Expression of Executor Gene Xa23 Enhances Resistance to Both Bacterial and Fungal Diseases in Rice. International Journal of Molecular Sciences. 2022; 23(12):6545. https://doi.org/10.3390/ijms23126545

Chicago/Turabian Style

Ji, Zhiyuan, Hongda Sun, Yena Wei, Man Li, Hongjie Wang, Jiangmin Xu, Cailin Lei, Chunlian Wang, and Kaijun Zhao. 2022. "Ectopic Expression of Executor Gene Xa23 Enhances Resistance to Both Bacterial and Fungal Diseases in Rice" International Journal of Molecular Sciences 23, no. 12: 6545. https://doi.org/10.3390/ijms23126545

APA Style

Ji, Z., Sun, H., Wei, Y., Li, M., Wang, H., Xu, J., Lei, C., Wang, C., & Zhao, K. (2022). Ectopic Expression of Executor Gene Xa23 Enhances Resistance to Both Bacterial and Fungal Diseases in Rice. International Journal of Molecular Sciences, 23(12), 6545. https://doi.org/10.3390/ijms23126545

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