Julius Kuehn Institute, Federal Research Centre for Cultivated Plants, Institute for Resistance Research and Stress Tolerance, Experimental Station for Potato Research, Rudolf-Schick-Platz 3, OT Groß Lüsewitz, D-18190 Sanitz, Germany.
Food Funct. 2010 Nov;1(2):209-18. doi: 10.1039/c0fo00063a. Epub 2010 Oct 5.
Wild potatoes are of increasing interest as a gene pool in breeding. In this study, 23 genotypes of two cultivated (S. tuberosum subsp. andigena, S. phureja) and two wild Solanum species (S. chacoense, S. pinnatisectum) were evaluated for contents of soluble phenols and soluble proteins as well as their antioxidant capacity measured as ascorbic acid and trolox equivalent. Amounts of phenols present in tuber tissue ranged from 0.25 to 2.84 mg kg(-1) fw. On average, S. pinnatisectum (pnt) exhibited 3.9-fold greater quantities of phenols in its tuber tissue than the other Solanum species. In pnt tissue, high phenol content coincided with high levels of soluble proteins and antioxidants. It is concluded that an involvement of individual accessions of pnt in breeding could be profitable for the antioxidant potential and thus for the nutritional value of new potato cultivars. The results also revealed that soluble phenols as well as proteins present in tuber tissue substantially contributed to the total antioxidant capacity of potatoes. Moreover, it was found that quantities of soluble phenols, proteins and antioxidants increased notably upon wounding the tubers, a fact which underlines the role of all these components in wound stress responses of potatoes.
野生马铃薯作为一种基因库，在育种方面越来越受到关注。本研究对 23 个栽培种（Solanum tuberosum subsp. andigena、S. phureja）和 2 个野生种（S. chacoense、S. pinnatisectum）的可溶性酚类物质和可溶性蛋白质含量及其抗氧化能力（以抗坏血酸和 Trolox 当量表示）进行了评估。块茎组织中酚类物质的含量范围为 0.25-2.84mg/kgfw。平均而言，S. pinnatisectum（pnt）的块茎组织中酚类物质的含量比其他茄属植物高 3.9 倍。在 pnt 组织中，高酚含量与高可溶性蛋白质和抗氧化剂水平相一致。因此，pnt 的个别品种参与杂交可能会提高新马铃薯品种的抗氧化潜力和营养价值。研究结果还表明，块茎组织中存在的可溶性酚类物质和蛋白质对马铃薯的总抗氧化能力有很大贡献。此外，研究还发现，当块茎受伤时，可溶性酚类物质、蛋白质和抗氧化剂的含量显著增加，这一事实强调了所有这些成分在马铃薯伤口应激反应中的作用。
