A multi-needle-assisted transformation of soybean cotyledonary node cells

Area of Science:

• Plant Biotechnology
• Molecular Biology
• Genetics

Background:

• Soybean [Glycine max (L) Merrill] transformation is crucial for crop improvement.
• Efficient genetic modification methods are needed to enhance soybean breeding programs.

Purpose of the Study:

• To develop a simple and effective method for wounding soybean cotyledonary node cells.
• To achieve a high frequency of soybean transformants using Agrobacterium tumefaciens.

Main Methods:

• Soybean seeds were germinated, and cotyledonary node cells of half-seeds were mechanically wounded using a multi-needle device.
• Wounded explants were inoculated with Agrobacterium tumefaciens carrying bar and sgfp genes.
• Selection of transformed cells was performed on media containing phosphinothricin (PPT).

Main Results:

• The developed wounding method resulted in a transformation efficiency of up to 12%.
• Polymerase chain reaction and Southern blot analysis confirmed stable transgene integration.
• Transgene expression was confirmed by green fluorescent protein (GFP) analysis, and adult plants showed significant herbicide resistance.

Conclusions:

• The new wounding technique offers a simple and efficient approach for soybean genetic transformation.
• This method facilitates the development of herbicide-resistant soybean varieties.
• The study demonstrates successful stable integration and expression of transgenes in soybean.