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Stress hormones and abiotic stresses have different effects on antioxidants in maize lines with different sensitivity
Author(s) -
Kellős T.,
Tímár I.,
Szilágyi V.,
Szalai G.,
Galiba G.,
Kocsy G.
Publication year - 2008
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1111/j.1438-8677.2008.00071.x
Subject(s) - biology , hormone , abiotic component , abiotic stress , sensitivity (control systems) , stress (linguistics) , botany , endocrinology , ecology , biochemistry , gene , linguistics , philosophy , electronic engineering , engineering
The effect of stress hormones and abiotic stress treatments on reactive oxygen species and on antioxidants was compared in two maize ( Zea mays L.) lines (Penjalinan and Z7) having different stress tolerance. Following treatment with abscisic acid, salicylic acid or hydrogen peroxide, the amount of hydrogen peroxide and lipid peroxides increased, while after osmotic stress or cultivation in continuous darkness, the levels were unchanged or decreased. The higher amount of lipid peroxides in Penjalinan indicated its greater sensitivity compared to Z7. The level of the examined antioxidants was increased by nearly all treatments. Glutathione and cysteine contents were higher after salicylic acid, hydrogen peroxide and polyethylene glycol treatments and lower after application of abscisic acid, NaCl and growth in darkness in Z7 than in Penjalinan. The activity of glutathione reductase, ascorbate peroxidase, catalase and glutathione S‐transferase was higher after almost all treatments in Z7. The expression of the glutathione synthetase (EC 6.3.2.3) gene was not affected by the treatments, while the level of γ‐glutamylcysteine synthetase (EC 6.3.2.2) and glutathione reductase (EC 1.6.4.2) transcripts increased after most treatments. The two stress hormones and the stress treatments resulted in different changes in antioxidant levels in the two maize lines, which indicates the specific, stress tolerance‐dependent response of plants to the various growth regulators and adverse environmental effects that were examined.