Woody Plant Transformation: Current Status, Challenges, and Future Perspectives

Area of Science:

• Plant biotechnology
• Forestry and horticulture
• Molecular genetics

Background:

• Woody plants (forest and fruit trees) offer vital ecological and economic benefits.
• Genetic improvement is hindered by long generation intervals and high heterozygosity.
• Genetic transformation offers a method to accelerate domestication and improvement.

Purpose of the Study:

• To critically analyze current woody plant transformation techniques.
• To evaluate the integration of established platforms with emerging technologies.
• To highlight advancements for predictable genetic engineering.

Main Methods:

• Review of established DNA delivery methods (Agrobacterium, Rhizobium, particle bombardment).
• Analysis of regeneration pathways (organogenesis, somatic embryogenesis, hairy root).
• Examination of disruptive technologies (developmental regulators, in planta systems, DNA-free genome editing).

Main Results:

• Conventional methods face challenges in efficiency, genotype dependency, and tissue culture reliance.
• Developmental regulators enhance regeneration.
• In planta systems reduce reliance on tissue culture.
• DNA-free genome editing addresses regulatory and public concerns.

Conclusions:

• Woody plant transformation is shifting from empirical optimization to rational engineering.
• Breakthroughs in genera like Populus, Malus, Citrus, and Pinus demonstrate this paradigm shift.
• These advancements are crucial for developing sustainable woody plant resources.