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. 2020 Jul 9;21(14):4846. doi: 10.3390/ijms21144846

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© 2020 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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The response of ChlF parameters in drought-tolerant (TS) (square symbols) and -sensitive (SS) (diamond symbols) varieties of sunflower to soil drying at 25 °C (solid symbols) and 35 °C (open symbols). Data are plotted against the fraction of transpirable soil water (FTSW) and a calibration between FTSW and soil water content (SWC). The solid horizontal line indicates the mean value of the well-watered control plants (n = 4) during the experimental period and the gray shading indicates ± standard deviation either side of the mean. The complete FTSW response of ChlF parameters can be found in Supplementary Data Figure S1.