Expression of ABI5 in Col wild-type, 35S:AtAUE1 transgenic plants, and ataue123 triple mutants. Total RNA was isolated from ten-day-old seedlings of Col wild-type, 35S:AtAUE1 transgenic plants, and ataue123 triple mutants. cDNA was synthesized and used for qRT-PCR to assess ABI5 expression, with ACT2 serving as an internal control. ABI5 expression levels in Col wild-type seedlings were normalized to 1, and relative expression levels in 35S:AtAUE1 and ataue123 triple mutants were calculated accordingly. Data are presented as mean ± SD of three technical replicates. Significantly different from that of the Col wild-type (*** p < 0.001).