Use of dihydroxy-indolyl sulfonamide compound and its salts are substituted for increasing stress tolerance in plants

The present invention, for increasing the yield and / or plant for enhancing the stress tolerance of plants to abiotic stress, the general formula (I) [wherein groups in the general formula (I), to the use of salts of dihydroxy-indolyl sulfonamide or the sulfonamide is substituted represented by] are defined as described in the specification. [Formula 1] .BACKGROUND