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. 2019 Aug 20;20(16):4065. doi: 10.3390/ijms20164065

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© 2019 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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Hormonal control of the SAM to specify meristematic and primordium fate. (a) Top: Cytokinin-mediated SAM regulatory network for meristematic fate specification. Bottom: Auxin-mediated SAM regulatory network for meristematic and floral primordium fate specification. Green indicates hormonal gradients. The arrows represent the activation of gene expression, while the flat arrows represent its repression. (b) Chromatin state switch for primordium specification by the ARF5/MP complex in response to auxin. The arrows represent the activation of gene expression, while the flat arrows represent its repression. (c) Chromatin state switch for primordium specification by ARF3 and the FIL complex. The arrows represent the activation of gene expression, while the flat arrows represent its repression.