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Plant and Cell Physiology, 1997, Vol. 38, No. 12 1333-1339
© 1997

Oxidative Damage to Membranes by a Combination of Aluminum and Iron in Suspension-Cultured Tobacco Cells

Yoko Yamamoto1, Akiko Hachiya and Hideaki Matsumoto

Research Institute for Bioresources, Okayama University Kurashiki, 710 Japan

1To whom correspondence should be addressed. Telephone and Fax: 086-434-1210, E-mail: yoko{at}rib.okayama-u.ac.jp

Aluminum (Al) and ferrous iron [Fe(II)] are separately non-toxic to cultured tobacco cells in nutrient solution. However, Al and Fe(II) together cause the peroxidation of membrane iipids, the accumulation of Al and Fe, and the loss of viability [Ono et al. (1995) Plant Cell Physiol. 36: 115]. We investigated the cause-and-effect relationships of these various responses. In cells exposed to Fe(TT) or Fe(III)-EDTA, both the peroxidation of ipids and the loss of viability were similarly enhanced by AlCl3 in a dose-dependent manner. During exposure to AlCl3, the accumulation of Al and the loss of viability became apparent rapidly and simultaneously at 8 h, whereas both the peroxidation of lipids and the accumulation of Fe occurred at later times. However, lipophilic antioxidants protected cells efficiently not only from the peroxidation of Iipids but also from the loss of viability and the accumulation of Al and Fe. These results suggest that the peroxidation of Iipids in the plasma membrane that is caused by both Al and Fe leads to the accumulation of Al and Fe and the loss of viability.

(Received April 18, 1997; Accepted October 1, 1997)
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