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Phytase expression in transgenic soybeans: stable transformation with a vector-less construct.

Xiao Rong Gao1, Guo Kun Wang, Qiao Su

  • 1Department of Bioscience and Biotechnology, Dalian University of Technology, Dalian, 116024, P.R. China. gxiaorong@yahoo.com

Biotechnology Letters
|July 5, 2007
PubMed
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Transgenic soybean plants were successfully engineered to express phytase using a pollen tube transformation method. This resulted in significantly enhanced phytase activity in both plant tissues and seeds.

Area of Science:

  • Plant Biotechnology
  • Molecular Biology
  • Genetics

Background:

  • Phytase is an enzyme crucial for phosphorus metabolism.
  • Genetic engineering offers a pathway to enhance phytase production in crops.
  • Soybean is a globally important legume crop with significant nutritional value.

Purpose of the Study:

  • To develop a method for introducing the phytase gene into soybean using the pollen tube pathway.
  • To assess the stability and expression of the introduced phytase gene in soybean progeny.
  • To quantify the phytase activity in transgenic soybean plants and seeds.

Main Methods:

  • A minimal linear gene cassette (35S-phytase gene-nos) with T-DNA borders was constructed.
  • The gene cassette was introduced into soybean via the pollen tube pathway.

Related Experiment Videos

  • Polymerase Chain Reaction (PCR) and Southern blot analyses were used to confirm gene integration and stability.
  • Phytase activity was measured in plant tissues and mature seeds.

    • Main Results:

    • The pollen tube pathway successfully delivered the gene cassette into soybean, with 13% of T(1) plants showing positive results via PCR.
    • Southern blot analysis confirmed stable integration of the phyA gene in T(2) progeny.
    • Phytase expression increased 2.5-fold over six weeks, reaching 150 U/mg protein.
    • Transgenic seeds (T(3)) exhibited significantly higher phytase activity (125 FTU/kg) compared to wild-type (64 FTU/kg).

    Conclusions:

    • The pollen tube pathway is an effective method for genetic transformation of soybean with the phytase gene.
    • Stable integration and expression of the phytase gene lead to enhanced phytase activity in soybean plants and seeds.
    • This advancement holds potential for improving phosphorus utilization in animal feed and reducing phosphorus pollution.