The relationship of antioxidant enzymes and some physiological parameters in maize during chilling
2004
Takac, T. (Slovenska Akademia Vied, Nitra (Slovak Republic). Ustav Genetiky a Biotechnologii Rastlin)
The changes in some physiological parameters of maize seedlings of two cultivars in response to chilling were studied. Special emphasis was laid on induced alterations in antioxidant enzymes (superoxide dismutase, catalase, ascorbate peroxidase and glutathione reductase) activities. The exposure of maize seedlings to chilling caused substantial defects in the 4-day-old seedlings and the seedlings with two fully developed leaves. The membrane semipermeability perturbations and the loss of viability in the young seedlings were observed. Similarly, we found a decrease of chlorophyll content, appearance of necrotic lesions and inhibition of growth in older plants. The measurements of superoxide dismutase, catalase, ascorbate peroxidase and glutathione reductase activities provided an evidence of reactive oxygen species formation, that is assumed to be a reason of the found damages. Significant differences in the studied parameters were found between the two cultivars. In conclusion, the electrolyte leakage and viability test was an effective method for the characterization of the chilling tolerance-level in maize cultivars.
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