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Titolo:
Mitochondrial adaptations to NaCl. Complex I is protected by anti-oxidantsand small heat shock proteins, whereas complex II is protected by proline and betaine
Autore:
Hamilton, EW; Heckathorn, SA;
Indirizzi:
Syracuse Univ, Dept Biol, Syracuse, NY 13244 USA Syracuse Univ Syracuse NY USA 13244 iv, Dept Biol, Syracuse, NY 13244 USA
Titolo Testata:
PLANT PHYSIOLOGY
fascicolo: 3, volume: 126, anno: 2001,
pagine: 1266 - 1274
SICI:
0032-0889(200107)126:3<1266:MATNCI>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
NADH-UBIQUINONE OXIDOREDUCTASE; ELECTRON-TRANSPORT CHAIN; OXIDATIVE STRESS; ASCORBATE PEROXIDASE; PEA LEAVES; LEAF MITOCHONDRIA; PHOTOSYSTEM-II; PLANTS; OXYGEN; MAIZE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Hamilton, EW Syracuse Univ, Dept Biol, 130 Coll Pl, Syracuse, NY 13244 USASyracuse Univ 130 Coll Pl Syracuse NY USA 13244 NY 13244 USA
Citazione:
E.W. Hamilton e S.A. Heckathorn, "Mitochondrial adaptations to NaCl. Complex I is protected by anti-oxidantsand small heat shock proteins, whereas complex II is protected by proline and betaine", PLANT PHYSL, 126(3), 2001, pp. 1266-1274

Abstract

High soil sodium (Na) is a common stress in natural and agricultural systems. Roots are usually the first tissues exposed to Na stress and Na stress-related impairment of mitochondrial function is likely to be particularly important in roots. However, neither the effects of NaCl on mitochondrial function, nor its protection by several potential adaptive mechanisms, have been well studied. This study investigated the effects of NaCl stress on maize (Zen mays) mitochondrial electron transport and its relative protection by osmoprotectants (proline, betaine, and sucrose), antioxidants (ascorbate, glutathione, and alpha -tocopherol), antioxidant enzymes (catalase and Cu/Zn-superoxide dismutase), and mitochondrial small heat shock proteins (sHsps). We demonstrate that Complex I electron transport is protected by antioxidants and sHsps, but not osmoprotectants, whereas Complex II is protectedonly by low concentrations of proline and betaine. These results indicate that NaCl stress damaged Complex I via oxidative stress and suggests that sHsps may protect Complex I as antioxidants, but NaCl damaged Complex II directly. This is the first study to demonstrate that NaCl stress differentially affects Complex I and II in plants and that protection of Complex I and II during NaCl stress is achieved by different mechanisms.

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Documento generato il 19/01/20 alle ore 20:09:07