Scientia Agricultura Sinica ›› 2014, Vol. 47 ›› Issue (23): 4563-4572.doi: 10.3864/j.issn.0578-1752.2014.23.002

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

Genome-Wide Identification and Analysis of Dof Transcription Factor Family in Maize

GE Min, LÜ Yuan-da, LI Tan, ZHANG Ti-fu, ZHANG Xiao-lin, ZHAO Han   

  1. Institute of Agro-Biotechnology, Jiangsu Academy of Agricultural Sciences/Provincial Key Lab of Agro-Biology, Nanjing 210014
  • Received:2014-04-16 Revised:2014-06-23 Online:2014-12-01 Published:2014-12-01

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Abstract: 【Objective】The study was carried out for genome-wide identification and analysis of the maize Dof (DNA binding with one finger) gene family. 【Method】Based on maize V3 version, a genome-wide overview of Dof gene family in maize, including the gene structures, phylogeny, and chromosome distribution, and mRNA expression atlas at 18 different development stages were made. A survey of the transcriptomes of V3 stage leaf tissues collected under nitrogen sufficient and limiting conditions was conducted using RNAseq. 【Result】The analyses revealed 46 Dof genes harbored in maize genome, named ZmV3Dof1- ZmV3Dof46. According to the phylogenetic relationships and sequence similarity, the gene family was divided into 8 subgroups, which ranged in size from 3 to 8 Dof genes. Genome chromosomal location analyses revealed that maize Dofs were distributed on almost all chromosomes, except for chromosome 9. In total, 12 ZmV3Dofs were presented on chromosome 1, 8 and 7 on chromosomes 5 and 3, 4 on chromosome 8, 3 on each of chromosomes 2, 4, 6, 7 and 10. Relatively high densities of Dofs were observed in some chromosomal regions, including the bottom of chromosomes 1, the top and bottom of chromosomes 5. Dof gene expression profiling analysis showed that some of genes have played diverse roles in the process of plant development, indicating the diversity of their function. DNA phylogenetic relationships showed the partial consistency with RNA profiles. There are 35 Dof genes showed different expressions in these two nitrogen treatments, and thirteen out of them showed greater differences. There are 21 Dof genes exhibited a significant response to low nitrogen supply, and eight out of them were induced by low nitrogen condition, suggesting Dof genes may play an important role in the regulation of nitrogen metabolism. 【Conclusion】In this study, the Dof gene family in maize known to date was identified. These findings indicate that members of this gene family may be involved in different plant biological processes, some of which probably are involved in plant nitrogen assimilation and metabolism. The preliminary genomic analysis will provide a foundation for future functional dissection of Dof family gene.

Key words: maize, Dof, transcription factor, gene family, nitrogen

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