In contrast to them, the expression level of ABI4 showed an increasing trend under ABA treatment, with a down-regulation at 1 h and a peak at 9 h ( Figure 2H ).
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Overexpression of <i>abscisic acid-insensitive gene ABI4</i> from <i>Medicago truncatula</i>, which could interact with ABA2, improved plant cold tolerance mediated by ABA signaling.
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