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Plant growth and secondary metabolism are commonly regulated by external cues such as light, temperature and water availability.In this study, we examined the effects of low and high temperatures, dehydration, photoperiods, and different growing stages on the changes of steviol glycosides (SGs) contents and corresponding biosynthetic genes expression in Stevia rebaudiana using HPLC and RT-PCR.Our observations showed that all of the fifteen genes were expressed maximally at 25 ℃, and the expressions of some genes were restrained both in low temperature (15 ℃) and high temperature (35 ℃).