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Light regulates the transcript level of GA metabolism genes. Levels of GA metabolism GA5 (GA20ox1), GA4 (GA3ox1), GA2ox1, GA2ox2, and GA2ox3, and GA-signaling RGA, SLY1, SLY2, AtGID1a, AtGID1b gene transcripts (determined by reverse transcription-PCR) in 7-d-old seedling hypocotyls grown in white light (L) or in the dark (D), then transferred to dark or light, respectively, for the time as indicated (1–24 h). ELF4a transcripts provide loading control.
