Controlling GRF4-GIF1 expression for efficient, genotype-independent transformation across wheat cultivars

Area of Science:

• Plant Science
• Agricultural Biotechnology
• Genetics

Background:

• Wheat genetic improvement is vital for global food security.
• Efficient, genotype-independent transformation is a bottleneck in wheat functional genomics and gene editing.
• GRF-GIF fusion technology enhances regeneration but can cause fertility issues.

Purpose of the Study:

• To optimize Agrobacterium-mediated wheat transformation using GRF4-GIF1.
• To improve transformation efficiency across diverse wheat cultivars.
• To mitigate negative pleiotropic effects of GRF4-GIF1 expression.

Main Methods:

• Developed an optimized Agrobacterium-mediated transformation protocol using GRF4-GIF1.
• Tested the protocol across multiple tetraploid and hexaploid wheat cultivars.
• Incorporated tissue-specific promoters and heat-inducible excision strategies.

Main Results:

• Achieved improved transformation efficiency through optimized selection pressure, zeatin concentration, and promoter choice.
• Demonstrated consistent GRF4-GIF1 enabled transformation across various wheat genotypes.
• Successfully minimized pleiotropic effects like reduced fertility while maintaining high transformation rates.

Conclusions:

• The refined GRF4-GIF1 system provides a robust platform for genotype-independent wheat transformation.
• This advancement supports gene function studies and gene editing in wheat.
• The protocol aids breeding efforts for enhanced crop productivity and resilience.