Roles of enzymatic and nonenzymatic antioxidants in plants during abiotic stress

Parvaiz Ahmad, Cheruth Abdul Jaleel, Mohamed A. Salem, Gowher Nabi, Satyawati Sharma

Research output: Contribution to journalReview articlepeer-review

880 Citations (Scopus)


Reactive oxygen species (ROS) are produced in plants as byproducts during many metabolic reactions, such as photosynthesis and respiration. Oxidative stress occurs when there is a serious imbalance between the production of ROS and antioxidant defense. Generation of ROS causes rapid cell damage by triggering a chain reaction. Cells have evolved an elaborate system of enzymatic and nonenzymatic antioxidants which help to scavenge these indigenously generated ROS. Various enzymes involved in ROS-scavenging have been manipulated, over expressed or downregulated to add to the present knowledge and understanding the role of the antioxidant systems. The present article reviews the manipulation of enzymatic and nonenzymatic antioxidants in plants to enhance the environmental stress tolerance and also throws light on ROS and redox signaling, calcium signaling, and ABA signaling.

Original languageEnglish
Pages (from-to)161-175
Number of pages15
JournalCritical Reviews in Biotechnology
Issue number3
Publication statusPublished - Sept 2010


  • ABA
  • Antioxidants
  • Calcium
  • ROS
  • Redox signaling

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology


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