3.3.4. Effect of Temperature on *S.* × *hainanensis* Sprouting

The *S.* × *hainanensis* sprouting rate, germination potential, and radicle length exhibited remarkable differences under different temperatures (Figure 4). As the temperature increased, the germination rate, germination potential, and radicle length of all groups showed unimodal curve changes (Figure 4a–c). The germination rate and germination potential increased from 30 ◦C to 35 ◦C. The germination rate (90.67%) and the germination potential (78.00%) peaked at 35 ◦C. The germination potential reached its minimum at 15 ◦C and the germination rate reached its minimum at 45 ◦C. As the temperature increased, the radicle length and the radicle perfectness ratio also presented unimodal curve changes (as shown in Figure 4c,d). The radicle length (4.83 cm) and the radicle perfectness ratio (100%) peaked at 35 ◦C.

**Figure 4.** Effects of different temperatures on indicators. Different letters indicate significant difference (*p* < 0.05).
