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Expression of OsNAR2.1 and OsNAR2s in transgenic lines and WT during the experimental growth period. Samples were collected (A) 30 days (the vegetative growth period), (B) 60 days (the anthesis stage) and (C) 75 days (the grain filling stage) after seedlings were transplanted to the field. RNA was extracted from culms. Error bars: SE (n = 3). The different letters indicate a significant difference between the transgenic line and the WT (P < 0.05, one-way ANOVA).
