Rice, indica (Oryza sativa L.)

Area of Science:

• Plant Biotechnology
• Genetics
• Agricultural Science

Background:

• Indica rice varieties, dominant in global cultivation, are typically recalcitrant to tissue culture and genetic transformation.
• Improving transformation efficiency in indica rice is essential for leveraging modern biotechnology in rice improvement.

Purpose of the Study:

• To develop and describe an efficient Agrobacterium-mediated transformation protocol for indica rice.
• To enhance the application of cutting-edge biotechnology in global rice production.

Main Methods:

• Immature embryos from greenhouse-grown indica rice plants were pretreated with heat and centrifuging.
• Cocultivation of pretreated immature embryos with Agrobacterium tumefaciens was performed.

Main Results:

• The protocol was successfully applied to multiple elite indica cultivars including IR8, IR24, IR64, and IR72.
• The method yielded 5 to 15 independent transgenic plants per immature embryo, demonstrating high efficiency.
• Immature embryos proved more efficient and less genotype-dependent for gene transfer compared to callus.

Conclusions:

• The described protocol offers a significant improvement for indica rice transformation.
• Utilizing immature embryos is a key factor for efficient and versatile gene transfer in indica rice.
• This advancement facilitates the integration of advanced biotechnologies into indica rice breeding programs.