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Overexpression of a Maize Transcription Factor ZmPHR1 Improves Shoot Inorganic Phosphate Content and Growth of Arabidopsis under Low-Phosphate Conditions

文献类型： 外文期刊

作者： Wang, Xiuhong 1 ; Bai, Jianrong 2 ; Liu, Huiming 3 ; Sun, Yi 6 ; Shi, Xiangyuan 5 ; Ren, Zhiqiang 5 ;

作者机构： 1.Shanxi Univ, Coll Life Sci, Taiyuan 030006, Peoples R China

2.Shanxi Acad Agr Sci, Inst Crop Sci, Taiyuan 030031, Peoples R China

3.Shanxi Acad Agr Sci, Taiyuan 030006, Peoples R China

4.Minist Agr, Key Lab Crop Gene Resources & Germplasm Enhanceme, Taiyuan 030031, Peoples R China

5.Shanxi Acad Agr Sci, Modern Agr Res Ctr, Taiyuan 030031, Peoples R China

6.Shanxi Acad Agr Sci, Biotechnol Res Ctr, Taiyuan 030031, Peoples R China

关键词： Maize;Transcription factor;ZmPHR1;Phosphorus use efficiency;Arabidopsis thaliana

期刊名称：PLANT MOLECULAR BIOLOGY REPORTER （ 影响因子：1.595； 五年影响因子：2.042 ）

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收录情况： SCI

摘要： Maize (Zea mays L.) yield is limited by the poor availability of inorganic phosphate (Pi) in many arable areas worldwide. Phosphorus use efficiency (PUE) is a complex multigene trait, with a single gene contributing only a small percentage to the phenotype. Transcription factors (TFs) are very important as a single TF frequently coordinates the expression of multiple genes in response to environmental signals. Previous studies have indicated that the TFs AtPHR1 and OsPHR2 play important roles in the regulation of plant phosphorus accumulation. However, little is known about the functions of PHR-like genes in maize. In this study, a member of the MYB-CC family encoding a 449-amino acid protein, ZmPHR1, was isolated. The ZmPHR1a center dot GFP fusion was localized in the nucleus, which indicates that ZmPHR1 is also a TF. Phylogenetic tree analysis revealed that ZmPHR1 belongs to the same subfamily of MYB-CCs as OsPHR1, OsPHR2 and AtPHR1. Transgenic Arabidopsis lines overexpressing ZmPHR1 were used to investigate the pleiotropic effects of this gene under low Pi conditions. Overexpression of ZmPHR1 led to the upregulation of multiple genes that regulate metabolism during Pi-starvation, which in turn resulted in an elevation in Pi content in shoots. Most notably, Arabidopsis overexpressing ZmPHR1 showed better growth under low-Pi conditions. The results presented in this study suggest that PUE could be improved through the manipulation of the TF ZmPHR1 in maize and possibly in other species under Pi-deficient conditions.

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