Abstract:Rhodiola sachalinensis A. Bor, a perennial herb, belonging to the family Crassulaceae, is mainly distributed in mountains of 1700~2500 m above sea level. It is a very important medicinal plant with high activities of anti-fatigue, anti-senescence and anti-radiation, due to the secondary metabolite, salidroside in its roots. In order to investigate the effects of light intensity and light quality on plant growth and salidroside content in roots of Rh. sachalinensis, a controlled environmental study was condu...