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Updated: Jul 15, 2026
10:12
A Robotic Platform for High-throughput Protoplast Isolation and Transformation
Published on: September 27, 2016
Determining the transgene containment level provided by chloroplast transformation
Stephanie Ruf1, Daniel Karcher, Ralph Bock
1Max-Planck-Institut für Molekulare Pflanzenphysiologie, Am Mühlenberg 1, D-14476 Potsdam-Golm, Germany.
Summary
Maternal inheritance of plastids (chloroplasts) is common in crops. Plastid transformation enhances transgene containment, but low-level paternal transmission can still occur, necessitating additional containment strategies for complete biosafety.
Area of Science:
- Plant Biology
- Genetics
- Biotechnology
Background:
- Plastids, including chloroplasts, are typically maternally inherited in most crop species.
- This maternal inheritance pattern prevents the transmission of plastid genes and transgenes via pollen.
- Plastid transformation is a valuable tool for enhancing transgene containment and biosafety in genetically modified plants.
Purpose of the Study:
- To evaluate the strictness of maternal inheritance in plastids.
- To determine the extent to which plastid transformation technology improves transgene confinement.
- To assess the potential for paternal transmission of transgenic plastids.
Main Methods:
- Development of an experimental system for stringent selection of paternal plastid transmission.
- Large-scale screening for occasional paternal inheritance of transgenic plastids in tobacco.
- Quantification of transmission frequencies into cotyledons and shoot apical meristems of F(1) seedlings.
Main Results:
- Low-level paternal inheritance of transgenic plastids was detected in tobacco.
- Transmission frequency into cotyledons was approximately 1.58 x 10⁻⁵.
- Transmission into the shoot apical meristem was significantly lower, at 2.86 x 10⁻⁶.
Conclusions:
- Plastid transformation effectively enhances the biosafety of transgenic plants by increasing transgene confinement.
- Residual risks of pollen transmission exist, even with plastid transformation.
- Stacking plastid transformation with other containment methods is necessary to completely eliminate outcrossing risks.
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