600191 Disclosed is a method for reducing temperature stress of plants which comprises applying an effective amount of one or more compounds selected from the group consisting of a compound represented by the formula (I) and an agriculturally acceptable salt thereof to a plant that has been exposed to or to be exposed to a temperature stress factor. Examples of compounds of formula (I) are: 4-oxo-4-(2-phenylethyl)aminobutyric acid, methyl 4-oxo-4-(4-phenylbutyl)aminobutyrate, methyl 4-oxo-4-(2-phenylethyl)aminobutyrate, 4-oxo-4-(4-phenylbutyl)aminobutyric acid, 5-oxo-5-[2-(3-indolyl)ethyl]aminovaleric acid, 5-oxo-5-[(1-naphthyl)methyl]aminovaleric acid, and methyl 4-oxo-4-[2-(4-iodophenyl)ethyl]aminobutyrate.
