Plant Genetic Engineering and Crop Improvement
Engineering Plants
Why plant engineering is distinctive
Plants must contend with cell walls, developmental complexity, and the need to preserve yield while adding a trait. Common goals include pest resistance, herbicide tolerance, improved nutrition, and stress tolerance.
Plant delivery strategies
Agrobacterium-mediated transformation
- Uses a natural DNA transfer system
- Widely used in many dicots
Particle bombardment
- Physical DNA delivery
- Useful when Agrobacterium is less effective
Which trait is a classic goal of crop engineering?
Pest resistance can reduce crop losses and pesticide use.
Correct answer: Pest resistance
Why is plant genetic engineering often slower than microbial engineering?
Breeding and regeneration steps take more time and can be more variable.
Correct answer: Plants have longer generation times and more complex development
Agrobacterium is especially known for:
Agrobacterium transfers DNA into plant cells and is widely adapted for transformation.
Correct answer: Natural DNA transfer into plant cells
Trait stacking
Multiple engineered traits can be combined in one cultivar, but each added trait increases design, testing, and regulatory complexity.
Examples of crop traits
| Trait | Potential benefit |
|---|---|
| Vitamin enrichment | Improved nutrition |
| Drought tolerance | Better performance under water stress |
| Insect resistance | Reduced crop damage |
| Delayed ripening | Longer shelf life |
What is one reason precise editing is attractive in crops?
This may simplify trait development and reduce disruption of other genes.
Correct answer: It can change a native gene with fewer foreign DNA additions