A chemical composition for reducing stress on a plant comprising: at least one substance (A) selected from the group consisting of compounds represented by Formula (I) and the like and a salt thereof and a substance (B) which affects a physiological function of the plant [in Formula (I), R1 to R4 each independently represents a hydrogen atom, -SO3H, -PO3H2, glycosyl group or -COR11. R11 represents an unsubstituted or substituted C1 to C30 alkyl group or an unsubstituted or substituted C2 to C30 alkenyl group.].
