Hydroponic treatment with salicylic acid decreases the effects of chilling injury in maize (Zea mays L.) plants |
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Authors: | T Janda G Szalai I Tari E Páldi |
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Institution: | (1) Agricultural Research Institute of the Hungarian Academy of Sciences, H-2462 Martonvásár, POB 19, Hungary, HU;(2) Department of Plant Physiology, József Attila University, H-6701 Szeged, POB 654, Hungary, HU |
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Abstract: | The addition of 0.5 mM salicylic acid (SA) to the hydroponic growth solution of young maize (Zea mays L.) plants under normal growth conditions provided protection against subsequent low-temperature stress. This observation
was confirmed by chlorophyll fluorescence parameters and electrolyte leakage measurements. In addition, 1 d of 0.5 mM SA pre-treatment
decreased net photosynthesis, stomatal conductivity and transpiration at the growth temperature (22/20 °C). Since there was
only a slight decrease in the ratio of variable to maximal fluorescence (Fv/Fm) the decrease in photosynthetic activity is not due to a depression in photosystem II. The analysis of antioxidant enzymes
showed that whereas SA treatment did not cause any change in ascorbate peroxidase (EC 1.11.1.11) and superoxide dismutase
(EC 1.15.1.1) activities, there was a decrease in catalase (EC 1.11.1.6) activity, and an increase in guaiacol peroxidase
(EC 1.11.1.7) and glutathione reductase (EC 1.6.4.2) activities after the 1-d SA treatment at 22/20 °C. In native polyacrylamide
gels there was, among the peroxidase isoenzymes, a band which could be seen only in SA-treated plants. It is suggested that
the pre-treatment of maize plants with SA at normal growth temperature may induce antioxidant enzymes which lead to increased
chilling tolerance.
Received: 4 June 1998 / Accepted: 23 November 1998 |
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Keywords: | : Antioxidant enzyme Cold stress Photosynthesis Salicylic acid Zea |
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