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Acta Agron Sin ›› 2016, Vol. 42 ›› Issue (10): 1487-1494.doi: 10.3724/SP.J.1006.2016.01487

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS • Previous Articles     Next Articles

Global Transcriptome Analysis in High- and Low-Nitrogen Responsive Inbred Lines of Maize

GE Min, LYU Yuan-Da, ZHANG Ti-Fu, ZHOU Ling, LIN Feng, and ZHAO Han*   

  1. Institute of Biotechnology, Provincial Key Laboratory of Agrobiology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
  • Received:2016-02-22 Revised:2016-06-20 Online:2016-10-12 Published:2016-07-28
  • Contact: Zhao Han,E-mail:zhaohan@jaas.ac.cn E-mail:gemin8614@163.com
  • Supported by:

    ThisworkwassupportedbygrantfromtheNaturalScienceFoundationofChina(31271728)andJiangsuAgricultureScienceandTechnologyInnovationFund[CX(14)2009].

Abstract:

Different maize genotypes have exhibited their variations in nitrogen responsiveness, however, the corresponding gene expression patterns are unexplored yet. Here, we performed a comprehensive transcriptome profiling of high- and low-nitrogen responsiveness genotypes in the conditions of sufficient and limiting nitrogen (SN and LN) supplies. Under LN supply, B73, a high nitrogen responsive genotype, accumulated a much lower nitrogen content than under SN condition in the leaf. Meanwhile, the N content of Mo17 didn’t show a significant difference between two treatments. Furthermore, RNAseq revealed that 13 867 and 10 028 genes were significantly differentially expressed in Mo17 and B73 with the treatments, with 9044, 4233 up-regulated and 4823, 5795 down-regulated under N limitation. Showing that, in LN supply, Mo17 had more expressed genes and higher expression variations than B73. A total of 342 differentially expressed genes with a significant interaction genotype by nitrogen were detected, which could be clustered into four groups. The functional annotations of genes demonstrated that these genes were mainly involved in amino acid metabolism, photosynthesis and biosynthesis of secondary metabolites, suggesting these genes may have their roles in modulating maize nitrogen use efficiency. The study promotes a better understanding of the mechanisms on maize nitrogen response, and provides candidate genes for breeding of crop nitrogen use efficiency in the future.

Key words: Maize, Nitrogen, Nitrogenstress, Transcriptomeprofiling, Nitrogenuseefficiency(NUE)

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