Growth regulator 5-aminolevulinic acid enhances the cold resistance of tomato plants

Low temperature stress, as one of the main abiotic stresses, severely hinders plant growth and has adverse effects on crop yield and quality. 5-Aminolevulinic acid (ALA), a growth regulator widely present in animals and plants, has been extensively utilized in plant cold resistance processes due to its efficient, non-toxic, and easily degradable characteristics.