**2. Allelopathy of VOCs of Plants**

With the increasing attention of experts on the allelopathy of volatile, the potential role of VOCs in agriculture has been gradually discovered. The allelopathy of VOCs on plants are summarized based on existing research, which involved the main allelopathy of plant VOCs. (Figure 2).

**Figure 2.** The main allelopathy of plants VOCs. (Note: This figure is widely inspired and adapted from Brilli et al. (2019) [49]).
