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. 2021 Mar 12;12:625493. doi: 10.3389/fpls.2021.625493

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Copyright © 2021 He, Liu, Li, Lamin-Samu, Yang, Yu, Izhar, Jan, Ali and Lu.

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) and the copyright owner(s) 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 exogenous ABA application on WT, saur32, and OE32-5 plants. (A) Effect of ABA treatment (1 μM) on the germination rate of saur32 mutant and WT; 0 μM ABA was used as control. (B) Effect of ABA concentrations (0, 0.2, 0.4, and 0.8 μM) on green cotyledons of WT and saur32 at 5 days post-germination. (C) The cotyledons’ growth was observed in the 1/2 MS medium with 0, 0.4, and 0.8 μM ABA using Pulse-Amplitude-Modulation (PAM) chlorophyll fluorometer (Note: 0.2 μM ABA phenotypes are not added because phenotypically they are the same as 0 μM and have no significant difference). (D) Accumulation of endogenous hormones in saur32 and WT plants. Mean values and standard deviation (+SD) are plotted as analyzed by Duncan’s multiple range (DMR) test (P < 0.05); asterisk (*) indicates significant difference.