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. 2019 Sep 3;8(9):323. doi: 10.3390/plants8090323

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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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Proposed model of Heat Shock Protein90s (HSP90s)/Polyamine oxidases (PAOs)/Polyamines (PAs)/H₂O₂ cross-talk in Arabidopsis thaliana: Under conditions of HS, as pivotal HSP stimulator (1), the transgenic/pharmacological reduction of HSP90 genes/HS proteins stimulate an increase of PA and acetylated-PA levels (2), a positive regulation of AtPAOs (3), and further increase of the PAO-related H₂O₂ (4). Reciprocally, underexpression of AtPAO in Atpao3 mutant reveals stimulation of AtHSP90 transcripts and HSP90 protein levels (5).