Relationship between polyphenol content of tubers and cultivating conditions in sweet potato [Ipomoea batatas]
2008
Zheng, S.H.(Saga Univ., Karatsu (Japan). Coastal Bioenvironment Center) | Yamazaki, N. | Nakamoto, H. | Yoshikado, T. | Arima, S.
Recently, sweet potato is noticed as a functional food, which has positive effects on the human health according to the research results. It is known that polyphenolic compounds contained in the tubers of sweet potato have the effects on which prevent lifestyle related diseases such as cancer, high blood pressure, arteriosclerosis, diabetes due to the antioxidative activity. To enhance the production of sweet potato in Uwaba area of Saga, we investigated the effects of soil property, fertilizer level, and temperature on the polyphenol content in the tubers of sweet potato. The polyphenol content was higher in the soils which contained low nitrogen and also organic matters, like the soil in Kouda, or Takashima of Karatsu. Moreover, the polyphenol content was not affected by the fertilizer level clearly, however, was enhanced by low temperature during enlargement of tubers. The results suggested that the polyphenol substance were easy to accumulate by the abiotic stresses in the tubers of sweet potato.
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