Effect of natural and growing conditions on the content of phenolics in potatoes with different flesh colour
2010
Hamouz, K.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Rostlinne Vyroby | Lachman, J.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Chemie | Hejtmankova, K.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Chemie | Pazderu, K.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Rostlinne Vyroby | Cizek, M.,Vyzkumny Ustav Bramborarsky, Havlickuv Brod (Czech Republic) | Dvorak, P.,Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Rostlinne Vyroby
In precise field trials in the Czech Republic from 2004-2008 the impact of location conditions, varieties with yellow, purple and red flesh and mineral fertilization on the content of total polyphenols (TP) and chlorogenic acid was investigated. The highest TP concentrations were reported at two locations with extreme climatic conditions; in those under stress due to low temperatures in the vegetation period at the mountainous area Stachy (5.89 mg TP/g DM) and those under drought stress in the warm lowland location Prerov nad Labem with light sandy soil (5.81 mg TP/g DM). The five-year experiment with the purple-fleshed Valfi variety (13.29 mg TP/g DM) reached 2.46 to 3.18 times higher content of TP in comparison with eight yellow-fleshed varieties. The yellow-fleshed Karin variety (5.39 mg TP/g DM) outperformed TP levels of other yellow-fleshed varieties by 3.1 to 29.1%. In another experiment conclusive differences between the eight varieties with purple and red flesh were found; the highest TP concentration was detected in cv. Violette (25.9 mg TP/g DM) with the darkest purple flesh. As to the chlorogenic acid concentration similar relationships between varieties were found as in the case of TP. High linear correlation (r = 0.8536) was found between chlorogenic acid and TP concentrations. Among the treatments of mineral N, P, K and Mg fertilization, the concentration of TP was only affected by the treatment with high doses of K and Mg, causing a decrease in TP content.
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