Glycoalkaloid and Calystegine Levels in Table Potato Cultivars Subjected to Wounding, Light, and Heat Treatments

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• 作者：Erik V. Petersson ; Usman Arif ; Vera Schulzova ; Veronika Krtkov谩 ; Jana Haj拧lov谩 ; Johan Meijer ; Hans Christer Andersson ; Lisbeth Jonsson ; Folke Sitbon
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2013
• 出版时间：June 19, 2013
• 年：2013
• 卷：61
• 期：24
• 页码：5893-5902
• 全文大小：340K
• 年卷期：v.61,no.24(June 19, 2013)
• ISSN：1520-5118

文摘

Potato tubers naturally contain a number of defense substances, some of which are of major concern for food safety. Among these substances are the glycoalkaloids and calystegines. We have here analyzed levels of glycoalkaloids (伪-chaconine and 伪-solanine) and calystegines (A₃, B₂, and B₄) in potato tubers subjected to mechanical wounding, light exposure, or elevated temperature: stress treatments that are known or anticipated to induce glycoalkaloid levels. Basal glycoalkaloid levels in tubers varied between potato cultivars. Wounding and light exposure, but not heat, increased tuber glycoalkaloid levels, and the relative response differed among the cultivars. Also, calystegine levels varied between cultivars, with calystegine B₄ showing the most marked variation. However, the total calystegine level was not affected by wounding or light exposure. The results demonstrate a strong variation among potato cultivars with regard to postharvest glycoalkaloid increases, and they suggest that the biosynthesis of glycoalkaloids and calystegines occurs independently of each other.

Keywords:

potato (Solanum tuberosum group Tuberosum); alkaloid metabolism; chaconine; food safety; solanine; plant stress response