Acta Physiologiae Plantarum

, Volume 29, Issue 3, pp 205–209 | Cite as

Responses of antioxidant defense system of Catharanthus roseus (L.) G. Don. to paclobutrazol treatment under salinity

  • Cheruth Abdul Jaleel
  • Ragupathi Gopi
  • Paramasivam Manivannan
  • Rajaram Panneerselvam
Original Paper


The effect of paclobutrazol, a plant growth regulator, on antioxidant defense system was investigated in Catharanthus roseus (L.) G. Don. plants subjected to NaCl stress. The growth parameters were significantly reduced under 80 mM NaCl treatment; however, this growth inhibition was less in paclobutrazol-treated (15 mg l−1 plant−1) plants. The non-enzymatic antioxidants ascorbic acid and reduced glutathione were affected under NaCl stress and they increased significantly under paclobutrazol treatment when compared to NaCl treated as well as control plants (P ≤ 0.05). The activity of antioxidant enzyme ascorbate peroxidase showed a significant enhancement under salinity stress. The catalase activity decreased in roots of NaCl-treated plants, but recovered with paclobutrazol treatment. The results suggested that paclobutrazol have significant role in contributing salt stress tolerance of C. roseus by improving the components of antioxidant defense system.


Ascorbate peroxidase Ascorbic acid Catalase Catharanthus roseus Glutathione Paclobutrazol 


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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2007

Authors and Affiliations

  • Cheruth Abdul Jaleel
    • 1
  • Ragupathi Gopi
    • 1
  • Paramasivam Manivannan
    • 1
  • Rajaram Panneerselvam
    • 1
  1. 1.Division of Plant Physiology, Department of BotanyAnnamalai UniversityAnnamalainagar India

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