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. 2020 Oct 28;9(11):1456. doi: 10.3390/plants9111456

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Model of MtCLE35 action in autoregulation of nodulation (AON). The MtCLE12 and MtCLE13 genes are induced in response to rhizobia inoculation, whereas the expression of the MtCLE35 gene is induced by both rhizobia inoculation and nitrate treatment. The CLAVATA3/ENDOSPERM SURROUNDING REGION-related (CLE) peptides encoded by the MtCLE12, MtCLE13, and MtCLE35 genes systemically inhibit nodulation via shoot-acting MtSUNN receptor kinase. MtCLE35 mediates nitrate-dependent inhibition of nodulation.