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. 2021 Feb 3;11:634819. doi: 10.3389/fpls.2020.634819

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Copyright © 2021 Zhou, Zhu, Qian, Guo and Yan.

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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A proposed model was illustrated for Bacillus subtilis SL18r-induced ISR. When tomato plants were infected by the foliar pathogen Botrytis cinerea, the expression of miR1918 was considerably increased. However, high-level transcription of miR1918 suppressed the expression of the target gene SlATL20 and further negatively regulated plant immune systems. Upon exposure to B. subtilis SL18r, the expression of MSTRG18363 was greatly stimulated in the leaves of tomato plants. Subsequently, the B. cinerea-initiated miR1918 was quickly decoyed by MSTRG18363, which prevented the miR1918-mediated inhibition of SlATL20 transcripts. This contributed to the increased resistance of SL18r-inoculated plants against B. cinerea infection.