Effect of culture environment on resveratrol content of Polygonum cuspidatum.

Resveratrol(,trans-3,4,5-trihydroxystilebene) is natural plant polyphenols and it is a kind of phytoalexin. It has preventative functions for cardiovascular diseases, anti-oxidative effects and anti-cancer activities.
Polygonum cuspidatum Sieb. et Zucc. belongs to Polygonaceae and is classified as perennial shrub rich in resveratrol and other secondary metabolites. In traditional Chinese medicine, it is used for cancer, hepatitis B, hypertension and other diseases.
051111 line was derived from Meifeng and selected by Mingdao University. This line has high levels of secondary metabolites including resveratrol, piceid and emodin, etc.
The phytoalexin content in the plants will be effected by environmental factor. Studies to investigate the effects of cultivated location, seasons, harvest parts on resveratrol content and plant growth on Puli、Taipei、Chunyang、Meifong.
The growth pattern of aboveground main stem and lateral shoot had been completed for two years old P. cuspidatum.
The harvest weight showed an obviously difference between aboveground and underground. Crops two years old and cultivaled at Meifong had the highest growth and harvest parts. Fresh weight of underground parts 55 g/part and 401.82 g/plant, dry weight 13.72 g/part and 140.73 g/plant.
The highest resveratrol content was 0.04 and 3.33 mg/g DW of aboveground and underground, respectively.
Harvesting in August used 051111 line showing the dry weight of P. cuspidatum aboveground and underground had the highest（10.59 g/part and 118.83 g/plant）, the highest resveratrol content of aboveground was in May（0.06 mg/g DW）, underground was in August（3.19 mg/g DW）.
Harvest part showed the weight and resveratrol content of part 5 and 6 better then other.
The total resveratrol content showed crops aboveground should choice the part 6 in July at Meifong(1.98 mg/part) and underground harvest in August at Meifong(561.35 mg/plant).