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. 2019 Mar 7;9:3890. doi: 10.1038/s41598-019-40362-7

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Influence of heat, drought, and heat + drought stresses on the accumulations of (a) soluble sugar, (b) free proline, (c) soluble protein and (d) heat shock protein in two maize hybrids. Capped bars above means represent ± SE of three replicates. Asterisks above columns means denote the significant differences compared with control treatment for a single maize hybrid. *P ≤ 0.05; **P ≤ 0.01.