3.3.5. Effect of Salinity on *S.* × *hainanensis* Seed Germination

As salinity increased, the germination rate, germination potential, radicle length, and intact rate of each group significantly decreased (Figure 5). The germination rate (82.67%) and the germination potential (75.33%) peaked at 0‰ salinity (Figure 5a,b). The difference was not obvious compared to the germination rate (81.33%) and germination potential (72.67%) at 2.5‰ salinity. However, the radicle growth of the latter was more robust and the radicle perfectness ratio was ideal (100%; Figure 5d); radicle length under low salinity (<7.5‰) almost doubled under high salinity (>10‰) (Figure 5c). The appropriate germination salinity of *S.* × *hainanensis* varied from 0‰ to 7‰.

**Figure 5.** Effects of different salinities on indicators. Different letters indicate significant difference (*p* < 0.05).

#### **4. Discussion**
