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. 2021 Nov 29;22(23):12910. doi: 10.3390/ijms222312910

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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A proposed model for the role of IAA and H₂O₂ in H₂S-induced chilling tolerance in cucumber. Chilling induces the accumulation of H₂S in the plants. H₂S induced by chilling promotes IAA generation, triggers H₂O₂ accumulation, and subsequently increases chilling tolerance by scavenging excessive ROS, improving CO₂ assimilation and photoprotection, and upregulating the levels of cold-responsive genes.