Gene expression analysis was performed according to method of Jin et al. (2015) (link). Total RNA was extracted with an RNA extraction kit (TRIzol reagent; Invitrogen), then the first-strand cDNA was synthesized using 3 μg of RNA and 200U M-MLV reverse transcriptase (Invitrogen). Real-time PCR was performed using an optical 96-well plate in an ABI Stepone plus PCR system (Applied Biosystems) by using SYBR Premix reagent F-415 (Thermo Scientific). OsUBI was used as an endogenous control (Supplementary Table S1 at JXB online).
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