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Journal of Integrative Agriculture  2016, Vol. 15 Issue (2): 271-281    DOI: 10.1016/S2095-3119(14)60973-4
Crop Genetics · Breeding · Germplasm Resources Advanced Online Publication | Current Issue | Archive | Adv Search |
Overexpression of IbMIPS1 gene enhances salt tolerance in transgenic sweetpotato
 WANG Fei-bing, ZHAI Hong, AN Yan-yan, SI Zeng-zhi, HE Shao-zhen, LIU Qing-chang
Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis and Utilization, Ministry of Education, China Agricultural University, Beijing 100193, P.R.China
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摘要  Myo-inositol-1-phosphate synthase (MIPS) is a key rate limiting enzyme in the de novo biosynthesis of myo-inositol in plants. In the present study, the IbMIPS1 gene was introduced into sweetpotato cultivar Xushu 18 and the transgenic plants exhibited significantly enhanced salt tolerance compared with the wild-type (WT). Overexpression of IbMIPS1 up-regulated the salt stress responsive genes, including myo-inositol monophosphatase (MIPP), pyrroline-5-carboxylate synthase (P5CS), pyrroline-5-carboxylate reductase (P5CR), psbA, phosphoribulokinase (PRK), and superoxide dismutase (SOD) genes, under salt stress. Inositol and proline content, SOD and photosynthesis activities were significantly increased, whereas malonaldehyde (MDA) and H2O2 contents were significantly decreased in the transgenic plants. These findings suggest that the IbMIPS1 gene may enhance salt tolerance of sweetpotato by regulating the expression of salt stress responsive genes, increasing the content of inositol and proline and enhancing the activity of photosynthesis.

Abstract  Myo-inositol-1-phosphate synthase (MIPS) is a key rate limiting enzyme in the de novo biosynthesis of myo-inositol in plants. In the present study, the IbMIPS1 gene was introduced into sweetpotato cultivar Xushu 18 and the transgenic plants exhibited significantly enhanced salt tolerance compared with the wild-type (WT). Overexpression of IbMIPS1 up-regulated the salt stress responsive genes, including myo-inositol monophosphatase (MIPP), pyrroline-5-carboxylate synthase (P5CS), pyrroline-5-carboxylate reductase (P5CR), psbA, phosphoribulokinase (PRK), and superoxide dismutase (SOD) genes, under salt stress. Inositol and proline content, SOD and photosynthesis activities were significantly increased, whereas malonaldehyde (MDA) and H2O2 contents were significantly decreased in the transgenic plants. These findings suggest that the IbMIPS1 gene may enhance salt tolerance of sweetpotato by regulating the expression of salt stress responsive genes, increasing the content of inositol and proline and enhancing the activity of photosynthesis.
Keywords:  IbMIPS1       overexpression       salt tolerance       sweetpotato  
Received: 06 February 2015   Accepted:
Fund: 

This work was supported by the China Agriculture Research System (CARS-11, Sweetpotato).

Corresponding Authors:  LIU Qing-chang, Tel/Fax: +86-10-62733710,E-mail: liuqc@cau.edu.cn     E-mail:  liuqc@cau.edu.cn
About author:  * These authors contributed equally to this study.

Cite this article: 

WANG Fei-bing, ZHAI Hong, AN Yan-yan, SI Zeng-zhi, HE Shao-zhen, LIU Qing-chang. 2016. Overexpression of IbMIPS1 gene enhances salt tolerance in transgenic sweetpotato. Journal of Integrative Agriculture, 15(2): 271-281.

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