Responses to drought induced oxidative stress in five finger millet varieties differing in their geographical distribution

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• 作者：Deepesh Bhatt (1)
  Manisha Negi (2)
  Priyadarshini Sharma (1)
  Saurabh C. Saxena (2)
  Anoop K Dobriyal (3)
  Sandeep Arora (1)
  
• 关键词：Oxidative stress ; Drought ; APX ; SOD ; Reactive oxygen species ; Finger millet
• 刊名：Physiology and Molecular Biology of Plants
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：17
• 期：4
• 页码：347-353
• 全文大小：342KB
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• 作者单位：Deepesh Bhatt (1)
  Manisha Negi (2)
  Priyadarshini Sharma (1)
  Saurabh C. Saxena (2)
  Anoop K Dobriyal (3)
  Sandeep Arora (1)
  
  1. Department of Molecular Biology & Genetic Engineering, G. B. Pant University of Agriculture & Technology, Pantnagar, India
  2. Department of Biochemistry, G. B. Pant University of Agriculture & Technology, Pantnagar, India
  3. Department of Biotechnology, HNB Garwal University (Uttarakhand), Pauri Campus, Srinagar, India
  

文摘

The study presents the impact of drought stress on five finger millet varieties (PR202, VL146, VL315, PES400 and VR708), representing contrasting areas of Indian sub-continent. Drought stress induced increase in the activity of superoxide dismutase, ascorbate peroxidase and glutathione reductase was higher in PR202 and VL315, while the activity was lower in the varieties PES400 and VR708. Ascorbate peroxidase : superoxide dismutase ratio, which is a crucial factor in alleviating drought stress, was higher in varieties PR202 and VL315, whilst the varieties PES400 and VR708 exhibited a lower ratio under stress. The variety PES400 recorded maximum stress induced damage, as indicated by higher accumulation of malondialdehyde and hydrogen peroxide; whereas the variety PR202 recorded least stress induced cytotoxic damage. The results clearly indicate that better drought tolerance of the variety PR202 is positively related to the capacity of its antioxidant system to scavenge reactive oxygen species, resulting in a reduced incidence of oxidative damage. Ascorbate peroxidase : superoxide dismutase ratio is found to be a critical factor governing the stress tolerance potential of different varieties. Therefore, varieties PR202 and VL315 were found to be tolerant while PES400 was susceptible to drought stress.