They are systemin, PSK, CLV3 and SCR, involved in wounding response, cell division, stem cell maintenance in the shoot apical meristem, and the interaction between pollen and stigma, respectively.

• 到目前为止, 被普遍认可的植物多肽激素有4种: 系统素、PSK、CLV3和SCR, 分别参与了植物的防御反应、细胞的分裂、茎端生长点干细胞数目维持和花粉-柱头的识别过程。