Highly active plant growth regulators. Its activity is mainly manifested in promoting plant growth, improving seed setting rate, increasing yield, improving quality, stress resistance and so on. This active ingredient, and other brassicins with similar structure and function, is known as the sixth phytohormone after auxin, gibberellin, cytokinin, abscisic acid and ethylene. Its high physiological activity, unique role in regulating growth and development, and extremely small dose can show good regulatory effect. Its main function is to promote cell elongation and division, regulate leaf shape, change cell membrane potential and enzyme activity, enhance photosynthesis, promote the biosynthesis of DNA, RNA and protein, and improve plant tolerance to environmental stress.