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Improved phosphorus acquisition by tobacco through transgenic expression of mitochondrial malate dehydrogenase from Penicillium oxalicum

文献类型： 外文期刊

作者： Lu, Jun 1 ; Gao, Xiaorong 1 ; Dong, Zhimin 2 ; Yi, Jun 1 ; An, Lijia 1 ;

作者机构： 1.Dalian Univ Technol, Sch Life Sci & Biotechnol, Dalian 116023, Peoples R China

2.Jilin Acad Agr Sci, Soybean Ctr, Changchun 130124, Jilin Province, Peoples R China

关键词： Malate dehydrogenase;Organic acid;Phosphorus acquisition;Transgenic plant

期刊名称：PLANT CELL REPORTS （ 影响因子：4.57； 五年影响因子：4.463 ）

ISSN： 0721-7714

年卷期： 2012 年 31 卷 1 期

页码：

收录情况： SCI

摘要： Phosphorus (P) is an essential nutrient for plant growth and development, but is generally unavailable and inaccessible in soil, since applied P is mostly fixed to aluminium (Al) and ferrum (Fe) in acidic soils and to calcium (Ca) in alkaline soils. Increased organic acid excretion is thought to be one mechanism by which plants use to enhance P uptake. In this study, we overexpressed a mitochondrial malate dehydrogenase (MDH) gene from the mycorrhizal fungi Penicillium oxalicum in tobacco. The MDH activity of transgenic lines was significantly increased compared to that of wild type. Malate content in root exudation of transgenic lines induced in response to P deficiency was 1.3- to 2.9-fold greater than that of wild type under the same condition. Among the transgenic lines that were selected for analysis, one line (M1) showed the highest level of MDH activity and malate exudate. M1 showed a significant increase in growth over wild type, with 149.0, 128.5, and 127.9% increases in biomass, when grown in Al-phosphate, Fe-phosphate, and Ca-phosphate media, respectively. M1 also had better P uptake compared to wild type, with total P content increased by 287.3, 243.5, and 223.4% when grown in Al-phosphate, Fe-phosphate, and Ca-phosphate media, respectively. To our knowledge, this is the first study on improving the ability of a plant to utilize P from Al-phosphate, Fe-phosphate, and Ca-phosphate by manipulating the organic acid metabolism of the plant through genetic engineering.

  • 相关文献

[1]Expression of mitochondrial malate dehydrogenase in improves phosphate solubilization. Lu, Jun,Gao, Xiaorong,An, Lijia,Dong, Zhimin. 2012

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