Fig. 2. UV-B is required for the Gmilpa1-2 phenotype.

a Representative image of the WT Hedou 12 (H12) and Gmilpa1-2 grown in a glasshouse at the V4 stage (four unrolled trifoliate leaves). Scale bar, 10 cm. b Height of the plants shown in (a), (n = 7 biologically independent samples; P = 0.1909), P-values were calculated by comparing to H12 plants using two-tailed Student’s t-test; ns not significant. c Representative images of the V2 stage of H12, Gmilpa1-2, and Gmilpa1 grown under white light (600 μmol m^–2 s^–1 white light, no UV-B, 25 °C, and a 12-h-light/12-h-dark photoperiod) and white light supplemented with UV-B (600 μmol m^–2 s^–1 white light, 1.5 μmol m⁻² s⁻¹ UV-B, 25 °C, and a 12-h-light/12-h-dark photoperiod). Scale bar, 10 cm. d Height of the seedlings shown in (c), (n > 6 biologically independent samples; P = 2.42 × 10⁻⁶ in H12 and Gmilpa1-2, P = 1.80 × 10⁻⁶ in H12 and Gmilpa1). Data are presented as mean values ± SD; P-value is calculated with a one-way ANOVA analysis–Tukey comparison, and the columns labeled without the same alphabet are significantly different (P < 0.05, two-sided). ***P < 0.001, ns not significant. Source data are provided as a Source Data file.