Agrobacterium-mediated maize transformation: immature embryos versus callus

Area of Science:

• Plant Biotechnology
• Molecular Biology
• Genetics

Background:

• Agrobacterium tumefaciens-mediated transformation is a key method for genetic modification in plants.
• Efficient transformation protocols are crucial for developing improved crop varieties, particularly in maize.

Purpose of the Study:

• To describe optimized protocols for Agrobacterium-mediated transformation of maize.
• To enable efficient generation of transgenic plants across various corn genotypes.

Main Methods:

• Utilized freshly isolated immature embryos and embryogenic Type I callus for transformation.
• Employed Agrobacterium harboring binary vectors with selectable markers (nptII, EPSPS) and GFP reporter gene.

Main Results:

• Achieved double-digit transformation frequencies in multiple maize genotypes, including commercial inbred lines.
• Green fluorescence protein (GFP) facilitated visual tracking of transformation events.

Conclusions:

• Developed robust and efficient protocols for Agrobacterium-mediated maize transformation.
• These methods support routine production of a large number of transgenic maize plants.