More and more evidences showed that plant secondary metabolites had various biological functions, and among these functions, the chemical ecological functions of plant secondary metabolites and its effects on quality of plant products had been attached great attention. The plant secondary metabolic pathways were regulated by enzymes in multiple points along the pathways and for a specific kind of secondary metabolite, its biosynthesis pathway existed as metabolic channels. The metabolic pathways could be modified by gene addition, gene knockout and engineering of transcription factors or regulating genes to enhance or reduce the production of specific secondary metabolites in order to boost the stress resistance of plants or to improve the quality of plant products. Fig 1, Ref
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