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Age-dependent transformation frequency in elite wheat varieties.
G M Pastori1, M D Wilkinson, S H Steele
1Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, Herts AL5 2JQ, UK. gabriela.pastori@bbsrc.ac.uk
Journal of Experimental Botany
|June 20, 2001
Summary
Optimizing wheat genetic engineering requires improving transformation efficiency. Using immature embryos from young donor plants significantly increased transformation frequencies in elite wheat varieties, leading to fertile transgenic plants.
Area of Science:
- Agricultural Science
- Plant Biotechnology
- Genetics
Background:
- Wheat genetic engineering aims to improve agronomic traits but faces low transformation frequencies.
- Elite wheat varieties exhibit variability in regeneration and transformation, hindering progress.
Purpose of the Study:
- To optimize particle bombardment transformation in elite wheat varieties.
- To identify factors influencing transformation efficiency, specifically donor plant age.
Main Methods:
- Particle bombardment was used to transform two elite wheat varieties.
- Immature embryos from donor plants of varying ages were utilized.
- Environmental conditions for donor plants were controlled.
Main Results:
- A strong correlation was observed between donor plant age and transformation frequency.
- Transformation frequency increased from 0.7% (old donors) to 5% (young donors).
- Up to 7.3% transformation frequency was achieved, producing phenotypically normal, fertile transgenic plants.
Conclusions:
- Donor plant age is a critical factor for optimizing wheat transformation efficiency.
- Controlled environmental conditions and optimal explant developmental stages enhance transformation reproducibility.
- This method successfully produced fertile transgenic wheat, advancing genetic improvement efforts.