Overexpression of CuZnSOD and APX enhance salt stress tolerance in sweet potato

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Title
Overexpression of CuZnSOD and APX enhance salt stress tolerance in sweet potato
Author(s)
H Yan; Q Li; Sumg-Chul Park; X Wang; Y J Liu; Y G Zhang; W Tang; M Kou; D F Ma
Bibliographic Citation
Plant Physiology and Biochemistry, vol. 109, pp. 20-27
Publication Year
2016
Abstract
Abiotic stresses cause accumulation of reactive oxygen species (ROS) in plants, CuZnSOD and APX are first line defenses against ROS caused by oxidative stress. In this study, CuZnSOD and APX were transferred into salt sensitive sweet potato (cv. Xushu 55?2) under control of stress inducible SWPA2 promoter and tolerance to salt stress was evaluated. When 100?mM NaCl was used to treat stem cuttings, transgenic plants showed enhanced tolerance compared to wild type (WT) plants. Rooting was significantly retarded in WT plants whereas all transgenic plants had significantly enhanced root growth under salt stress. Integration of SOD gene was confirmed by southern blot analysis, and the copy number ranged from 1 to 3. The expression levels of CuZnSOD and APX in transgenic plants were significantly increased up to 13.3 and 7.8 folds to WT under salinity conditions, respectively. SOD and APX activity and ROS staining showed enzyme activities of transgenic plants were increased under salt stress. These results show that CuZnSOD and APX have important roles in enhancing the salt tolerance of sweet potato
Keyword
APXCuZnSODSalt stressSweet potatoTransgenic plants
ISSN
0981-9428
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/j.plaphy.2016.09.003
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
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