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

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Overexpression of IbMIPS1 gene enhances salt tolerance in transgenic sweetpotato

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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 IbMIPSI 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 H_2O_2 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.

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《农业科学学报（英文版）》 |2016年第2期|271-281|共11页
作者
WANG Fei-bing; ZHAI Hong; AN Yan-yan; SI Zeng-zhi; HE Shao-zhen; LIU Qing-chang;
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Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis and Utilization,Ministry of Education,China Agricultural University,Beijing 100193,P.R.China;

Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis and Utilization,Ministry of Education,China Agricultural University,Beijing 100193,P.R.China;

Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis and Utilization,Ministry of Education,China Agricultural University,Beijing 100193,P.R.China;

Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis and Utilization,Ministry of Education,China Agricultural University,Beijing 100193,P.R.China;

Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis and Utilization,Ministry of Education,China Agricultural University,Beijing 100193,P.R.China;

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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Overexpression of IbMIPS1 gene enhances salt tolerance in transgenic sweetpotato

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