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. 2018 Jan 17;8:2257. doi: 10.3389/fpls.2017.02257

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Copyright © 2018 Ma, Wang, Zhang, Zhang, Liu and Lan.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Effect of night/day temperature variation (N/DTV) on germination of heteromorphic seeds of S. ferganica. Seeds collected in 2014 were used in the test and seed vigor was lower at the moment. (A–E) Heteromorphic seeds incubated at different N/DTV. 5/15, 10/20, 15/25, 20/30, and 25: 5/15 represents 5°C in dark for 12 h and then 15°C in light for 12 h, and the same meaning for 10/20, 15/25, 20/30; 25 represents 25°C in dark for 12 h then in light for 12 h. ^∗ represents the value of zero. L, M, S: large, middle, small seed. Bars with different lowercase letters indicate significant differences (P < 0.05) according to the Tukey’s test. Values are means ± SE of four replicates.