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. 2021 Jul 23;12:686545. doi: 10.3389/fpls.2021.686545

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Copyright © 2021 Feng, Fu, Han, Xu, Liu, Bi and Ai.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Interactive effects of MT and SNP on activities and relative mRNA expression of antioxidant enzymes in cucumber seedlings under cold stress. (A–D) Activities of superoxide dismutase (SOD), peroxidase (POD), ascorbate peroxidase (APX), and glutathione reductase (GR), respectively. (E–H) Relative mRNA expression of SOD, POD, APX, and GR, respectively. Three-leaf stage seedlings were foliar sprayed with 100 μM MT, 75 μM SNP, 100 μM cPTIO+100 μM MT, 50 μM p-CPA + 75 μM SNP, or deionized water (control) for 24 h and then were exposed to 5°C for 48 h. Data are represented as mean ± SD (n = 3). Different letters indicate a significant difference between samples according to Duncan's new multiple range test (p < 0.05).