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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/).
IAA content (per FW) in the third and fourth leaves and roots of wild-type (WT) and transgenic (IPT) tobacco plants 1 h after the first HS treatment at 40–42 °C. Significantly different means are labeled with different letters (ANOVA followed by Duncan’s test at p < 0.05, n = 9).