Parahormone promoting plant root elongation and application thereof

A parahormone scutellarin promoting plant root elongation, and root elongation effect inhibition of antagonism auxin substances 2,4-D and antagonism methyl jasmonate is provided, and an application of scutellarin in preparation of parahormones for promoting the plant root elongation, and the root elongation effect inhibition of the antagonism auxin substances 2,4-D and the antagonism methyl jasmonate is also provided. The plant root elongation promotion effect of the plant secondary metabolite scutellarin is first disclosed, scutellarin mutually antagonizes with the two phytohormone 2,4-D andmethyl jasmonate having the root elongation inhibition effect, and the antagonism effect is dose-dependent, so the plant root elongation effect of scutellarin is a parahormone effect. Above application is a first application of scutellarin in the plant field, so a new field is displayed for the application of scutellarin, thereby the excavation of the value of scutellarin is promoted.