J Integr Plant Biol. ›› 2009, Vol. 51 ›› Issue (12): 1095-1103.DOI: 10.1111/j.1744-7909.2009.00886.x

Special Issue: Abiotic Stresses

• Plant-environmental Interactions • Previous Articles     Next Articles

Potato Responds to Salt Stress by Increased Activity of Antioxidant Enzymes

Keyvan Aghaei1,2, Ali Akber Ehsanpour2 and Setsuko Komatsu1*   

  1. 1National Institute of Crop Science, Tsukuba 305-8518, Japan
    2Department of Biology, Faculty of Sciences, University of Isfahan, Isfahan 8174673441, Iran Present address of Keyvan Aghaei: Department of Biology, University of Zanjan, Zanjan 45195-313, Iran
  • Received:2009-05-04 Accepted:2009-09-08 Published:2009-11-26
  • About author:*Author for correspondence Tel/(Fax): +81 29 838 7142; E-mail: skomatsu@affrc.go.jp


To understand the response of potato to salt stress, antioxidant enzyme activities and ion content were analyzed for a sensitive and a tolerant cultivar. Nodal cuttings of the tolerant cultivar, Kennebec, and the sensitive cultivar, Concord, were exposed to media without or with 30, 60, 90 or 120 mmol/L NaCl for 4 weeks. On exposure to NaCl, the length and fresh and dry weight of both shoots and roots of Concord showed greater decrease than those of Kennebec. The decrease in shoot growth was more severe than that of the root for both cultivars. The K+ content of shoots and roots of both cultivars was reduced in a dose-dependent manner by exposure to NaCl; the Na+ content increased. Activities of ascorbate peroxidase, catalase and glutathione reductase were increased in NaCl-exposed shoots of Kennebec; the corresponding activities in NaCl-exposed shoots of Concord were decreased. Roots of both cultivars showed similar changes in the activities of these enzymes on exposure to NaCl. These studies established that enzyme activities in Concord shoots are inversely related to the NaCl concentration, whereas those in Kennebec do not show a dose dependency, which is also the case for the roots of both cultivars. Our findings suggest that an increase in activity of antioxidant enzymes, such asascorbate peroxidase, catalase and glutathione reductase, can contribute to salt tolerance in Kennebec, a salt resistant cultivar of potato.

Aghaei K, Ehsanpour AA, Komatsu S (2009). Potato responds to salt stress by increased activity of antioxidant enzymes. J. Integr. Plant Biol. 51(12), 1095–1103.

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