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. 2020 Jun 9;20:268. doi: 10.1186/s12870-020-02479-0

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Effect of temperature regimes [optimal temperature (OT: 24/14 °C) and high temperature (HT: 32/22 °C)] on leaf physiological traits. a and b chlorophyll index (SPAD units), c and d minimum fluorescence yield (F_o; relative units), e and f maximum fluorescence yield (F_m; relative units), g and h thylakoid membrane damage (F_o/F_m ratio; relative units), i and j stomatal conductance (mol m^− 2 s^− 1), and k and l photosynthetic rate (μmol m^− 2 s^− 1) during anthesis (experiment I) and grain filling (experiment II) stage, respectively. Values shown are LSMEAN ± standard error of LSMEAN [n = 36; 3 replications × 6 days of measurement (0, 2, 4, 6, 8, and 12 days after treatment imposition) x repeat of the experiment I and II (2)]. LSMEANS estimates with same letter are not significantly different at P ≤ 0.05