Fig. 1.

BR accelerates seed germination by promoting cell expansion. (A) Germination phenotypes of wild-type (WT) Arabidopsis (Col) seeds treated with 1 µM BR for 12 h and 24 h. (B) Percentages of testa and endosperm rupture in (A). (C) Hypocotyl length of WT seeds treated with 1 µM BR at 36 h. (D) Images of embryonic axis cells of WT seeds treated with 1 µM BR at 36 h; the yellow asterisk indicates the first cell. (E and F) Cell length and width, respectively, of the embryonic axis of WT seeds in (D). Seeds germinated on half-strength basal MS were used as control. ND, no detection. The black asterisks indicate significant differences compared with control (one-way ANOVA was used to analyze the significant differences). Three biological replicates were used for analysis. *P<0.05; **P<0.01.