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Article

Magnaporthe oryzae Transcription Factor MoBZIP3 Regulates Appressorium Turgor Pressure Formation during Pathogenesis

by
Chengyu Liu
,
Ningning Shen
,
Qian Zhang
,
Minghui Qin
,
Tingyan Cao
,
Shuai Zhu
,
Dingzhong Tang
and
Libo Han
*
College of Life Science, State Key Laboratory of Ecological Control of Fujian-Taiwan Crop Pests, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Plant Immunity Center, Fujian Agriculture and Forestry University, Fuzhou 350002, China
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2022, 23(2), 881; https://doi.org/10.3390/ijms23020881
Submission received: 10 December 2021 / Revised: 10 January 2022 / Accepted: 12 January 2022 / Published: 14 January 2022
(This article belongs to the Special Issue Molecular Plant-Microbe Interactions)
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Abstract

The devastating fungus Magnaporthe oryzae (M. oryzae) forms a specialized infection structure known as appressorium, which generates enormous turgor, to penetrate the plant cells. However, how M. oryzae regulates the appressorium turgor formation, is not well understood. In this study, we identified MoBZIP3, a bZIP transcription factor that functioned in pathogenesis in M. oryzae. We found that the pathogenicity of the MoBZIP3 knockout strain (Δmobzip3) was significantly reduced, and the defect was restored after re-expression of MoBZIP3, indicating that MoBZIP3 is required for M. oryzae virulence. Further analysis showed that MoBZIP3 functions in utilization of glycogen and lipid droplets for generation of glycerol in appressorium. MoBZIP3 localized in the nucleus and could bind directly to the promoters of the glycerol synthesis-related genes, MoPTH2, MoTGL1 and MoPEX6, and regulate their expression which is critical for glycerol synthesis in the appressorium turgor pressure generation. Furthermore, the critical turgor sensor gene MoSln1 was also down regulated and its subcellular localization was aberrant in Δmobzip3, which leads to a disordered actin assembly in the Δmobzip3 appressorium. Taken together, these results revealed new regulatory functions of the bZIP transcription factor MoBZIP3, in regulating M. oryzae appressorium turgor formation and infection.
Keywords: Magnaporthe oryzae; transcription factor; appressorium turgor pressure; virulence Magnaporthe oryzae; transcription factor; appressorium turgor pressure; virulence

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MDPI and ACS Style

Liu, C.; Shen, N.; Zhang, Q.; Qin, M.; Cao, T.; Zhu, S.; Tang, D.; Han, L. Magnaporthe oryzae Transcription Factor MoBZIP3 Regulates Appressorium Turgor Pressure Formation during Pathogenesis. Int. J. Mol. Sci. 2022, 23, 881. https://doi.org/10.3390/ijms23020881

AMA Style

Liu C, Shen N, Zhang Q, Qin M, Cao T, Zhu S, Tang D, Han L. Magnaporthe oryzae Transcription Factor MoBZIP3 Regulates Appressorium Turgor Pressure Formation during Pathogenesis. International Journal of Molecular Sciences. 2022; 23(2):881. https://doi.org/10.3390/ijms23020881

Chicago/Turabian Style

Liu, Chengyu, Ningning Shen, Qian Zhang, Minghui Qin, Tingyan Cao, Shuai Zhu, Dingzhong Tang, and Libo Han. 2022. "Magnaporthe oryzae Transcription Factor MoBZIP3 Regulates Appressorium Turgor Pressure Formation during Pathogenesis" International Journal of Molecular Sciences 23, no. 2: 881. https://doi.org/10.3390/ijms23020881

APA Style

Liu, C., Shen, N., Zhang, Q., Qin, M., Cao, T., Zhu, S., Tang, D., & Han, L. (2022). Magnaporthe oryzae Transcription Factor MoBZIP3 Regulates Appressorium Turgor Pressure Formation during Pathogenesis. International Journal of Molecular Sciences, 23(2), 881. https://doi.org/10.3390/ijms23020881

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