Considered the two actions of Cu2+, the concentration of 10-4g/L Cu2+ is proper. And Cu2 + can be regarded as a proper abiotic elicitor.

• 考虑两种相反的作用，浓度为10-4mol/L 的Cu2+是比较合适的，可以认为Cu2+是一种良好的非生物诱导子。