Abstract
Potato tubers ( Solanum tuberosum L. cv Bintje) were stored at 20 °C for 210 days without desprouting to study the lipoxygenase pathway during aging. After 15 days of storage, potato tubers sprouted, while after 45–60 days, apical dominance was lost and multiple sprouts developed. Analysis of the fatty acid hydroperoxides (HPOs) revealed that 9- S-hydroperoxide of linoleic acid (9-HPOD) was the main oxylipin formed. Between 45 and 60 days of storage, increases in the levels of 9-HPOD and colneleic acid were observed. Analysis of phospholipids and galactolipids by electrospray ionisation tandem mass spectrometry (ESI-MS/MS) showed that a decrease in the levels of phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylinositol (PI), digalactosyldiacylglycerol (DGDG), and monogalactosyldiacylglycerol (MGDG) occurred between 0 and 45 days of aging. The decrease in the amount of linoleic acid in complex lipids correlates well with the amount of 9-HPOD and colneleic acid produced.
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