Plant Growth Regulation

, Volume 42, Issue 3, pp 203–211 | Cite as

Effects of 24-epibrassinolide on seed germination, seedling growth, lipid peroxidation, proline content and antioxidative system of rice (Oryza sativa L.) under salinity stress

  • Filiz Özdemir
  • Melike Bor
  • Tijen Demiral
  • İsmail Türkan


The effects of 24-epibrassinolide (24-epiBL) on seedling growth, antioxidative system, lipid peroxidation, proline and soluble protein content were investigated in seedlings of the salt-sensitive rice cultivar IR-28. Seedling growth of rice plants was improved by 24-epiBL treatment under salt stress conditions. When seedlings treated with 24-epiBL were subjected to 120 mM NaCl stress, the activities of superoxide dismutase (EC, catalase (EC and glutathione reductase (EC did not show significant difference, whereas the activity of ascorbate peroxidase (EC significantly increased. Increased activity of peroxidase (EC under NaCl stress showed remarkable decrease in the 24-epiBL+NaCl-applied group. Lipid peroxidation level significantly increased under salt stress but decreased with 24-epiBL application revealing that less oxidative damage occurred in this group (24-epiBL+NaCl). In addition, increased proline content in the NaCl-applied group was decreased by 24-epiBL application in the 24-epiBL+NaCl-applied group. Soluble protein content was increased by 24-epiBL application even under NaCl stress, being also higher than control conditions (no 24-epiBL or NaCl treatment). 24-epiBL treatment considerably alleviated oxidative damage that occurred under NaCl-stressed conditions and improved seedling growth in part under salt stress in sensitive IR-28 seedlings.

Antioxidant enzymes 24-epibrassinolide Lipid peroxidation Proline Rice (Oryza sativa L.) Salt stress 


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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Filiz Özdemir
    • 1
  • Melike Bor
    • 1
  • Tijen Demiral
    • 1
  • İsmail Türkan
    • 1
  1. 1.Faculty of Science, Department of BiologyEge UniversityBornova-İzmirTurkey

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