Journal
FEBS LETTERS
Volume 553, Issue 3, Pages 370-376Publisher
WILEY
DOI: 10.1016/S0014-5793(03)01060-3
Keywords
ATP-binding cassette protein; pleiotropic drug resistance protein; rice (Oryza saliva L.) root; Heavy metal stress; jasmonic acid; hypoxic stress; redox perturbation
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Little is known about the role of pleiotropic drug resistance (PDR)-type ATP-binding (ABC) proteins in plant responses to environmental stresses. We characterised ospdr9, which encodes a rice ABC protein with a reverse (ABC-TMS6)(2) configuration. Polyethylene glycol and the heavy metals Cd (20 muM) and Zn (30 muM) rapidly and markedly induced ospdr9 in roots of rice seedlings. Hypoxic stress also induced ospdr9 in rice roots, salt stress induced ospdr9 at low levels but cold and heat shock had no effect. The plant growth regulator jasmonic acid, the auxin alpha-naphthalene acetic acid and the cytokinin 6-benzylaminopurine triggered ospdr9 expression. The antioxidants dithiothreitol and ascorbic acid rapidly and markedly induced ospdr9 in rice roots; the strong oxidant hydrogen peroxide also induced ospdr9 but at three times lower levels. The results suggested that redox changes may be involved in the abiotic stress response regulation of ospdr9 in rice roots. (C) 2003 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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