Application of arabidopsis thaliana TIR2 gene in improving salt stress resistance of plants

The invention provides application of an arabidopsis thaliana TIR2 gene in improving salt stress resistance of plants. Interaction protein of the TIR2 gene comprises IAA4 and IAA8; an overexpression vector of the arabidopsis thaliana TIR2 gene is obtained through a genetic engineering technology in the invention; an overexpression strain of arabidopsis thaliana is obtained accordingly; an arabidopsis thaliana TIR2 gene overexpression homozygous strain is finally obtained after screening; the arabidopsis thaliana TIR2 gene overexpression homozygous strain is salt-tolerant and has good plant salt stress resistance; the seed germination rate and the cotyledon expansion rate can be increased; the seed germination and cotyledon expansion time can be shortened; and furthermore, the length of theroot system of an adult plant seedling can be increased. According to the invention, experiments confirm that the arabidopsis thaliana TIR2 gene has a potential application value in the aspect of improving the salt stress re