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Titolo:
Alterations of intracellular pH in response to low temperature stresses
Autore:
Yoshida, S; Hotsubo, K; Kawamura, Y; Murai, M; Arakawa, K; Takezawa, D;
Indirizzi:
Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 0600819, Japan Hokkaido Univ Sapporo Hokkaido Japan 0600819 oro, Hokkaido 0600819, Japan
Titolo Testata:
JOURNAL OF PLANT RESEARCH
fascicolo: 1106, volume: 112, anno: 1999,
pagine: 225 - 236
SICI:
0918-9440(199906)112:1106<225:AOIPIR>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
VACUOLAR H+-ATPASE; RADIATA L WILCZEK; PHOSPHOLIPID DEGRADATION INVIVO; HELIANTHUS-TUBEROSUS L.; FREEZE-THAW CYCLE; WOODY PLANT-CELLS; CYTOPLASMIC PH; INORGANIC-PHOSPHATE; ENDOMEMBRANE SHEATH; MAGNETIC-RESONANCE;
Keywords:
chilling injury; cold acclimation; cytoplasmic acidification; freezing injury; plasma membrane; vacuolar H+-ATPase; vacuolar membrane;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
67
Recensione:
Indirizzi per estratti:
Indirizzo: Yoshida, S Shinoro 2-10-8-17, Sapporo, Hokkaido 0028022, Japan Shinoro 2-10-8-17 Sapporo Hokkaido Japan 0028022 028022, Japan
Citazione:
S. Yoshida et al., "Alterations of intracellular pH in response to low temperature stresses", J PLANT RES, 112(1106), 1999, pp. 225-236

Abstract

In chilling-sensitive plants, the inactivation of the vacuolar H+-ATPase is one of the primary cellular events directly resulting from cold exposure. We demonstrate here that cold-induced inactivation of the proton translocating enzyme is closely linked to the rapid acidification of the cytoplasm and the concomitant alkalization of the vacuoles, suggesting an important role of the enzyme in maintaining homeostasis of the cellular pH in a cold environment. The stability of the vacuolar H+-ATPase to cold both in vivo andin vitro is distinctly different between species sensitive and insensitiveto cold. These findings provide further insight into the way in which the vacuolar H+-ATPase is involved in cold adaptation of plants. In addition, the temperature reduction and the concentration of the cytoplasm as a consequence of freeze-induced dehydration may also result in changes in the cellular pH. In fact, we demonstrate here that the cytoplasm is markedly acidified upon freezing; in particular, in cells of less hardy plants. Freeze-induced acidification is presumably due to changes in the physicochemical properties of the cytoplasm and the changes in the permeability of the vacuolar membrane both of which result from severe dehydration. The physiological significance of freeze-induced acidification of the cytoplasm is discussed.

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Documento generato il 06/04/20 alle ore 01:51:45