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. 2021 Mar 17;11(3):450. doi: 10.3390/biom11030450

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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 (http://creativecommons.org/licenses/by/4.0/).

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Summary of phytohormone responses and changes in the expression profiles of the key hormone metabolism-related genes elicited by low temperature treatment and/or FR enrichment. FR-M (Treatment 1): The plantlets were exposed to high FR at the age of 18–28 days under constant 15 °C. FR-M/FR-C(28) (Treatment 2): The plantlets were subjected to high FR for 10 days at 15 °C, then the temperature was dropped to 5 °C for seven days (at high FR). FR-C(18) (Treatment 3): The plantlets were 18 days old when the temperature was dropped to 5 °C for seven days (at high FR). ABA: abscisic acid; IAA: indole-3-acetic acid; JA: jasmonic acid; SA: salicylic acid; cZ: cis-zeatin; active CKs: active cytokinins; CKX9: cytokinin oxidase/dehydrogenase 9; COAA: acetyl-CoA acetyltransferase; YUCCA5: indole-3-pyruvate monooxygenase; ZEP1: zeaxanthin epoxidase; NCED1: 9-cis-epoxycarotenoid dioxygenase1; SDR2: short-chain dehydrogenase; AO2: aldehyde oxidase 2; LOX: lipoxygenase; PAL: phenylalanine ammonia-lyase.