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Transgenic Research

, Volume 17, Issue 4, pp 633–643 | Cite as

Transgenic maize plants expressing a fungal phytase gene

  • Rumei Chen
  • Guangxing Xue
  • Ping Chen
  • Bin Yao
  • Wenzhu Yang
  • Qianli Ma
  • Yunliu FanEmail author
  • Zuoyu Zhao
  • Mitchell C. Tarczynski
  • Jinrui Shi
Original Paper

Abstract

Maize seeds are the major ingredient of commercial pig and poultry feed. Phosphorus in maize seeds exists predominately in the form of phytate. Phytate phosphorus is not available to monogastric animals and phosphate supplementation is required for optimal animal growth. Undigested phytate in animal manure is considered a major source of phosphorus pollution to the environment from agricultural production. Microbial phytase produced by fermentation as a feed additive is widely used to manage the nutritional and environmental problems caused by phytate, but the approach is associated with production costs for the enzyme and requirement of special cares in feed processing and diet formulation. An alternative approach would be to produce plant seeds that contain high phytase activities. We have over-expressed Aspergillus niger phyA2 gene in maize seeds using a construct driven by the maize embryo-specific globulin-1 promoter. Low-copy-number transgenic lines with simple integration patterns were identified. Western-blot analysis showed that the maize-expressed phytase protein was smaller than that expressed in yeast, apparently due to different glycosylation. Phytase activity in transgenic maize seeds reached approximately 2,200 units per kg seed, about a 50-fold increase compared to non-transgenic maize seeds. The phytase expression was stable across four generations. The transgenic seeds germinated normally. Our results show that the phytase expression lines can be used for development of new maize hybrids to improve phosphorus availability and reduce the impact of animal production on the environment.

Keywords

Maize Phytate Fungal phytase phyA2 Transgenic plant 

Notes

Acknowledgments

We thank Mr. Li Denghai, Prof. Zhang Shihuang and Dr. Li Mingshun for their help. We acknowledge Key National Project of China Crop Genetic Resources and Gene Improvement for providing greenhouse and other facilities. This work was partially supported by the National Basic Research and development Program of China (973 Program) (No. 2005CB120905) and a research grant from Pioneer Hi-Bred International, a DuPont Company.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Rumei Chen
    • 1
  • Guangxing Xue
    • 2
  • Ping Chen
    • 1
  • Bin Yao
    • 3
  • Wenzhu Yang
    • 1
  • Qianli Ma
    • 1
  • Yunliu Fan
    • 1
    Email author
  • Zuoyu Zhao
    • 4
  • Mitchell C. Tarczynski
    • 4
  • Jinrui Shi
    • 4
  1. 1.Biotechnology Research InstituteChinese Academy of Agricultural SciencesBeijingP.R. China
  2. 2.Crop Sciences InstituteChinese Academy of Agricultural SciencesBeijingP.R. China
  3. 3.Feed Research InstituteChinese Academy of Agricultural SciencesBeijingP.R. China
  4. 4.Pioneer Hi-Bred International, A DuPont CompanyJohnstonUSA

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