Oxidative stress, growth factor production and budding in potato tubers during cold storage

Massimo Reverberi, Mauro Picardo, Alessandra Ricelli, Emanuela Camera, Corrado Fanelli, Anna Adele Fabbri

Research output: Contribution to journalArticlepeer-review

Abstract

In order to verify the role played by oxidation in the budding of potato tubers (Solanum tuberosum L. cv. Kennebec), the physiological events occurring below bud at 4°C have been studied for a period of 6 months. The low temperature storage induced an increase in the degree of unsaturation and a decrease in the ratio of saturated/unsaturated fatty acids of membrane polar lipids with a subsequent increase of lipid hydroperoxides (LOOH). Cold stress increased both enzymatic antioxidative activities (superoxide dismutase, SOD, E.C.1.15.1.1; catalase, CAT, E.C. 1.11.1.6), and α-tocopherol levels thus protecting membrane's polyunsaturated lipids. Between 0 and 15 days of storage SOD/CAT ratio, α-tocopherol, LOOH levels and the degree of lipid unsaturation showed strong variations. After 30 to 120/150 days the antioxidative system seemed to reach a homeostasis different from that of time 0, accompanied by a constant increase of indole-3-acetic acid (IAA) after 60 days. The antioxidative system, after 150 days, lost its efficiency while LOOH levels were maintained higher than time 0 and IAA concentration was sufficient to allow sprouting.

Original languageEnglish
Pages (from-to)833-841
Number of pages9
JournalFree Radical Research
Volume35
Issue number6
Publication statusPublished - 2001

Keywords

  • α-tocopherol
  • Catalase
  • Indole-3-acetic acid
  • Lipid hydroperoxides
  • Potato tuber
  • Superoxide dismutase

ASJC Scopus subject areas

  • Biochemistry

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