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Antioxidative system in sweet potato root is activated by low-temperature storage
Si-Qi Wang1, Jun Tang2, Kang-Di Hu1
1School of Food and Biological Engineering, Hefei University of Technology, Hefei, China.
Journal of the Science of Food and Agriculture
|January 25, 2019
Summary
Sweet potatoes resist chilling injury through enhanced antioxidant enzyme activity, crucial for better storage performance. This study highlights the role of reactive oxygen species (ROS) metabolism in sweet potato cold tolerance.
Area of Science:
- Plant physiology
- Biochemistry
- Agricultural science
Background:
- Sweet potato is vulnerable to chilling injury during low-temperature storage.
- Understanding reactive oxygen species (ROS) metabolism is key to mitigating this issue.
Purpose of the Study:
- To investigate the link between chilling injury and ROS metabolism in sweet potato.
- To compare ROS metabolism and antioxidant enzyme activity between chilling-tolerant and sensitive cultivars.
Main Methods:
- Analysis of ROS content and antioxidant enzyme activities (APX, SOD, CAT, GR).
- Measurement of antioxidant enzyme gene expression.
- Comparison between storage-tolerant (Xushu 32) and sensitive (Yanshu 25) cultivars.
Main Results:
- Antioxidant enzyme activities increased initially under chilling stress, then declined.
- ROS metabolite levels rose as scavenging enzyme activity decreased.
- The tolerant cultivar (Xushu 32) exhibited higher antioxidant enzyme activity, gene expression, and antioxidant content, with lower ROS levels.
Conclusions:
- The antioxidative system is activated in sweet potato storage roots.
- Enhanced antioxidative capacity correlates positively with improved storage performance in tolerant cultivars.
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