Fusarium-produced vitamin B6 promotes the evasion of soybean resistance by Phytophthora sojae.

Shuchen Wang, Xiaoyi Zhang, Zhichao Zhang, Yun Chen, Qing Tian, Dandan Zeng, Miao Xu, Yan Wang, Suomeng Dong, Zhonghua Ma, Yuanchao Wang, Xiaobo Zheng, Wenwu Ye

Journal of integrative plant biology 2023 Sep

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Plants can be infected by multiple pathogens concurrently in natural systems. However, pathogen-pathogen interactions have rarely been studied. In addition to the oomycete Phytophthora sojae, fungi such as Fusarium spp. also cause soybean root rot. In a 3-year field investigation, we discovered that P. sojae and Fusarium spp. frequently coexisted in diseased soybean roots. Out of 336 P. sojae-soybean-Fusarium combinations, more than 80% aggravated disease. Different Fusarium species all enhanced P. sojae infection when co-inoculated on soybean. Treatment with Fusarium secreted non-proteinaceous metabolites had an effect equal to the direct pathogen co-inoculation. By screening a Fusarium graminearum mutant library, we identified Fusarium promoting factor of Phytophthora sojae infection 1 (Fpp1), encoding a zinc alcohol dehydrogenase. Fpp1 is functionally conserved in Fusarium and contributes to metabolite-mediated infection promotion, in which vitamin B6 (VB6) produced by Fusarium is key. Transcriptional and functional analyses revealed that Fpp1 regulates two VB6 metabolism genes, and VB6 suppresses expression of soybean disease resistance-related genes. These results reveal that co-infection with Fusarium promotes loss of P. sojae resistance in soybean, information that will inform the sustainable use of disease-resistant crop varieties and provide new strategies to control soybean root rot. © 2023 The Authors. Journal of Integrative Plant Biology published by John Wiley & Sons Australia, Ltd on behalf of Institute of Botany, Chinese Academy of Sciences.

Citation

Shuchen Wang, Xiaoyi Zhang, Zhichao Zhang, Yun Chen, Qing Tian, Dandan Zeng, Miao Xu, Yan Wang, Suomeng Dong, Zhonghua Ma, Yuanchao Wang, Xiaobo Zheng, Wenwu Ye. Fusarium-produced vitamin B6 promotes the evasion of soybean resistance by Phytophthora sojae. Journal of integrative plant biology. 2023 Sep;65(9):2204-2217