A variety of studies are being conducted to help to improve the fruit quality of strawberry plants in an endeavor to increase their exports abroad. The fruit quality of strawberries is primarily determined by chemical qualities such as soluble sugars, organic acids, and antioxidants. The functional ingredients of strawberry fruits are represented by many secondary metabolites, such as anthocyanins, flavonoids, and phenolic compounds, which are presumed to be used defensively to prevent harmful damage caused by reactive oxygen species