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. 2019 Jun 7;19:242. doi: 10.1186/s12870-019-1833-8

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 3 — Chlorophyll index (SPAD units), thylakoid membrane damage (F_o/F_m ratio; unitless) and components of seed yield per plant as a function of quantum yield of PSII (ΦPSII; unitless) under drought stress in wheat-alien chromosome lines (water withheld for 16 d). The CS check is shown as a white circle. The curve is fitted by a linear function. (a) chlorophyll index, y = 25.0 + 24.1x; r² = 0.13 (P < 0.05); (b) thylakoid membrane damage, y = 0.424–0.328x; r² = 0.33 (P < 0.001); (c) seed set percentage, y = 8.1 + 94.7x; r² = 0.42 (P < 0.001); (d) individual seed weight, y = − 4.21 + 105.2x; r² = 0.39 (P < 0.001); (e) seed yield per plant, y = − 0.396 + 3.61x; r² = 0.42 (P < 0.001) and (f) harvest index, y = − 5.61 + 48.83x; r² = 0.49 (P < 0.001)