植物在与各种病原菌的长期斗争中,都锻炼了一套防御和阻击病害的本领。为了免受病原菌的入侵,植物能在体表设置各种障碍来防御“敌人”。如有些植物株形直立,叶片又细又窄,当病菌随着风雨降落到植物的表面,这些又细又窄的叶面就会让它们难以立足而滑落下去。有些植物的整个植株外表还会长有一层角质层,因为,绝大多数病原菌都 Plants have exercised a set of skills in defense and disease control in the long struggle against various pathogenic bacteria. In order to avoid the invasion of pathogens, plants can set various obstacles in the body surface to defend the “enemy.” If some plants are erect and their leaves thin and narrow, when the germs descend to the plant surface with the wind and rain, these thin and narrow foliage will make it difficult for them to slip down and fall. The entire plant surface of some plants will also have a layer of stratum corneum, because the vast majority of pathogens are