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. 2019 Mar 14;10:444. doi: 10.3389/fmicb.2019.00444

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Copyright © 2019 Li, Zheng, Zhu, Chen, Zhang, He, Chen, Lv, Pei, Zhang, Zhang, Wang, Zhang, Wang, Wang, Li and Lu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Proposed working model of MoIVD in M. oryzae. In wild-type strain, leucine is normally degraded by the leucine catabolism pathway and electrons are transferred to the respiratory chain from MoIvd, while in the Δmoivd mutants, the pathway was blocked at the third step where isovaleryl-CoA was converted into isovaleric acid. The isovaleric acid accumulation in mutant resulted in the reduced growth and decreased conidiation. The reduced virulence probably resulted from the mutant’s inability to overcome host ROS defense. “e^-” indicates electron. “?” means a probable virulence reduction mechanism of mutant not coping with ROS stress during infection.