FIGURE 4.

Effect of gibberelline (GA) on germination of Suaeda salsa brown and black seeds under normal and salt stress conditions. Germination percentage of brown (A) and black (B) seeds in the present of 50 μm paclobutrazol and indicated concentrations of GA₄ or GA₁ under non-stressed conditions. The brown and black seeds were treated with 0, 0.1, 1, 10, or 50 μM GA₁ or GA₄ solution containing 50 μM paclobutrazol under continuous light at 22°C. Germination percentages were determined after 5 days of treatment. (C) Germination percentage of brown and black seeds in the present of 50 μm paclobutrazol and indicated concentrations of GA₄ under salt stress conditions. The brown and black seeds were treated with 1 or 50 μM GA₄ solution containing 50 μM paclobutrazol with or without 200 mM NaCl under continuous light at 22°C. Germination percentages were determined after 5 days of treatment. Percentage means and SE values (error bars) were calculated from the results of three independent experiments (n > 100 seeds/seed type/experiment). Asterisks indicate significant differences as determined by a Student’s t-test (^∗∗P < 0.01 and ^∗∗∗P < 0.001).