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

Research output: Contribution to journalArticlepeer-review

201 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)205-209
Number of pages5
JournalActa Physiologiae Plantarum
Volume29
Issue number3
DOIs
Publication statusPublished - Jun 2007
Externally publishedYes

Keywords

  • Ascorbate peroxidase
  • Ascorbic acid
  • Catalase
  • Catharanthus roseus
  • Glutathione
  • Paclobutrazol

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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