Abstract
The effects of NaCl stress on the activity of antioxidant enzymes, lipid peroxidation, cell membrane stability, net photosynthetic rate, gas-exchange, and chlorophyll content were investigated in two Jerusalem artichoke cultivars, Dafeng (salt-tolerant) and Wuxi (salt-sensitive), grown under control (nutrient solution) or salt stress (nutrient solution containing 75, 150, and 225 mM NaCl) conditions for 7 days. In leaves of salt-tolerant cv. Dafeng, superoxide dismutase (EC 1.15.1.1), peroxidase (EC 1.11.1.7), and catalase (EC 1.11.1.6) activities significantly increased as compared to the controls, whereas no significant change was observed in cv. Wuxi. Lipid peroxidation and cell membrane injury were enhanced in both cultivars. Net photosynthesis and stomatal conductance decreased in response to salt stress, but cv. Dafeng showed a smaller reduction in photosynthesis than cv. Wuxi. The results indicated that stomatal aperture limited leaf photosynthetic capacity in the NaCl-treated plants of both cultivars. However, significant reduction in the leaf chlorophyll content due to NaCl stress was observed only in cv. Wuxi. These results suggested that salt-tolerant Jerusalem artichoke varieties may have a better protection against reactive oxygen species, at least in part, by increasing the activity of antioxidant enzymes under salt stress.
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Abbreviations
- CAT:
-
catalase
- MDA:
-
malondialdehyde
- NBT:
-
nitroblue tetrazolium
- POD:
-
peroxidase
- ROS:
-
reactive oxygen species
- SOD:
-
superoxide dismutase
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Original Russian Text © Y.F. Xue, Zh.P. Liu, 2008, published in Fiziologiya Rastenii, 2008, Vol. 55, No. 6, pp. 863–858.
This text was submitted by the authors in English.
An erratum to this article can be found online at http://dx.doi.org/10.1134/S1021443709010221.
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Xue, Y.F., Liu, Z.P. Antioxidant enzymes and physiological characteristics in two Jerusalem artichoke cultivars under salt stress. Russ J Plant Physiol 55, 776–781 (2008). https://doi.org/10.1134/S102144370806006X
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DOI: https://doi.org/10.1134/S102144370806006X