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Osgstu3 and osgtu4 , encoding tau class glutathione S ‐transferases, are heavy metal‐ and hypoxic stress‐induced and differentially salt stress‐responsive in rice roots 1
Author(s) -
Moons Ann
Publication year - 2003
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(03)01077-9
Subject(s) - salicylic acid , jasmonic acid , abscisic acid , dithiothreitol , glutathione , chemistry , reactive oxygen species , biochemistry , hydrogen peroxide , enzyme , gene
Glutathione S ‐transferases (GSTs) have poorly understood roles in plant responses to environmental stresses. A polyethylene glycol (PEG)‐induced tau class GST was identified in rice roots by protein microsequencing. PEG and the heavy metals Cd (20 μM), Zn (30 μM), Co and Ni rapidly and markedly induced osgstu4 and osgstu3 in rice seedling roots. Osgstu4 and osgstu3 were also induced in roots by hypoxic stress but not by cold nor heat shock. Salt stress and abscisic acid (ABA) rapidly induced osgstu3 in rice roots, whereas osgstu4 exhibited a late salt stress and no ABA response. Salicylic acid, jasmonic acid and the auxin α‐naphthalene acetic acid triggered osgstu4 and osgstu3 expression. Osgstu4 and osgstu3 were rapidly and markedly induced by the antioxidant dithiothreitol and the strong oxidant hydrogen peroxide, which suggested that redox perturbations and reactive oxygen species are involved in their stress response regulations.