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. 2015 Mar 11;15:82. doi: 10.1186/s12870-015-0459-8

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© Su et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Chlorophyll fluorescence response of V. amurensis and ‘Muscat Hamburg’ under two combined drought−cold stress modes. (a)−(c) indicate the response of Fo (a), Fv/Fm (b) and Fv/Fo (c) to gradient cooling (GC) mode, while (d)−(f) represent the response of Fo (d), Fv/Fm (e) and Fv/Fo (f) to non−acclimated freezing (NAF) mode. The values were the mean value±SE of three replicates, and * and ** indicate significant differences between V. amurensis and ‘Muscat Hamburg’ at P<0.05 and P<0.01 level (t test), respectively.