title: Oxidative stress, growth factor production and budding in potato tubers during cold storage.
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 degrees 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 alpha-tocopherol levels thus protecting membrane's polyunsaturated lipids. Between 0 and 15 days of storage SOD/CAT ratio, alpha-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.
authors.affiliation: Dipartimento Biologia Vegetale, Università La Sapienza, Rome, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Reverberi
authors.forename: M
authors.initials: M
authors.lastname: Picardo
authors.forename: A
authors.initials: A
authors.lastname: Ricelli
authors.forename: E
authors.initials: E
authors.lastname: Camera
authors.forename: C
authors.initials: C
authors.lastname: Fanelli
authors.forename: A A
authors.initials: AA
authors.lastname: Fabbri
mesh_terms: D002374:Catalase / Q000378:metabolism; D003080:Cold Temperature; D005227:Fatty Acids / Q000378:metabolism; D006133:Growth Substances / Q000096:biosynthesis*; D007210:Indoleacetic Acids / Q000378:metabolism; D008054:Lipid Peroxides / Q000378:metabolism; D018384:Oxidative Stress; D018517:Plant Roots / Q000235:genetics / Q000378:metabolism; D011198:Solanum tuberosum / Q000254:growth & development* / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000378:metabolism; D013997:Time Factors; D024502:alpha-Tocopherol / Q000378:metabolism
chemical_list: D005227:Fatty Acids; D006133:Growth Substances; D007210:Indoleacetic Acids; D008054:Lipid Peroxides; C030737:indoleacetic acid; D002374:Catalase; D013482:Superoxide Dismutase; D024502:alpha-Tocopherol