A space-saving visual screening method, Glycine max FAST, for generating transgenic soybean

Area of Science:

• Plant Biotechnology
• Genetics
• Molecular Biology

Background:

• Establishing homozygous transgenic soybean (Glycine max) lines is challenging and resource-intensive.
• Conventional methods require significant time, space, and labor for screening and selection.

Purpose of the Study:

• To develop an efficient, non-destructive method for selecting homozygous transgenic soybean plants.
• To accelerate the development of improved soybean lines with desirable agronomic traits.

Main Methods:

• Developed Fluorescence-Accumulating Seed Technology (GmFAST) using a seed-specific promoter and OLE1-GFP marker.
• Utilized Agrobacterium-mediated transformation to introduce the marker into soybean cotyledonary nodes.
• Selected homozygous transgenic seeds non-destructively using a fluorescence stereomicroscope.

Main Results:

• GmFAST enabled identification of homozygous transgenic soybean seeds based on strong OLE1-GFP fluorescence.
• The method reduced required growing space by 90% compared to traditional techniques.
• Successfully generated a transgenic soybean line with increased seed pods and oil production, linked to Glyma13g30950 overexpression.

Conclusions:

• GmFAST offers a space-saving, visual, and non-destructive screening approach for soybean transformation.
• This technology enhances the efficiency of developing valuable soybean lines.
• Identified a potential gene (Glyma13g30950) regulating soybean seed pod formation.