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Plant Cell, Vol. 11, 1195-1206, July 1999, Copyright © 1999, American Society of Plant Physiologists

A Recessive Arabidopsis Mutant That Grows Photoautotrophically under Salt Stress Shows Enhanced Active Oxygen Detoxification

Kazuo Tsuganea, Kyoko Kobayashia, Yasuo Niwaa, Yasushi Ohbab, Keishiro Wadab, and Hirokazu Kobayashia
a Laboratory of Plant Cell Technology, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, 52-1 Yada, Shizuoka 422-8526, Japan
b Department of Biology, Faculty of Science, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan

Correspondence to: Hirokazu Kobayashi, hirokazu{at}u-shizuoka-ken.ac.jp (E-mail), 81-54-264-5584 (fax)

Mutagenized Arabidopsis seedlings (ecotype Columbia) were screened for the ability to grow photoautotrophically on solid medium containing 200 mM NaCl. A novel mutant line, designated pst1 (for photoautotrophic salt tolerance1), was obtained. There were no significant differences between pst1 and wild-type plants with regard to their ability to induce proline as an osmoregulatory solute. In addition, the content of monovalent cations in pst1 plants grown with or without salt stress was equal to that in the wild type. We observed that light, even at moderate intensities, increased the effects of salt stress on wild-type plants. The pst1 seedlings were nearly 10 times more tolerant to methyl viologen than were wild-type seedlings. We also found that the activities of the active oxygen scavengers superoxide dismutase and ascorbate peroxidase were enhanced significantly in pst1 plants. The pst1 plants also were tolerant to other stresses, such as high light intensity and toxic monovalent cations. The recessive nature of the pst1 mutation indicates that the potential for salt-stress tolerance is blocked in wild-type Arabidopsis.




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