Conditions for optimal transient gene expression of reporter genes (chloramphenicol acetyl transferase and /3-glucuronidase) by polyethylene glycol or electrical treatment of Eucalyptus gunnii protoplasts derived from callus or cell suspension cultures were investigated. The efficiency of electroper
Optimization of polyethylene glycol mediated transient gene expression in pea protoplasts
β Scribed by Mogens Nicolaisen; Gert B. Poulsen
- Publisher
- Springer
- Year
- 1993
- Tongue
- English
- Weight
- 357 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0167-6857
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β¦ Synopsis
We have investigated factors influencing polyethylene glycol mediated DNA uptake and B-glucuronidase expression in pea (Pisum sativum L.) protoplasts. It was found that for optimal 13-glucuronidase expression the molecular weight and concentration of polyethylene glycol should be 4000 and 20%, respectively. The amount of plasmid DNA should be 25 txg per 5 x 105 protoplasts in each treatment, and the concentration of Mg 2+ in the transformation buffer should be 15 mM. The optimized protocol was applicable to all four pea cultivars tested.
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The influence of two enzyme solutions, differing only in the presence or absence of Macerozyme, on protoplast yield, colony formation and transient GUS (/~-glucuronidase) activity was studied. For all parameters tested the presence of Macerozyme during protoplast isolation had a negative influence.
A transient Γ-glucuronidase (GUS)-assay was performed to evaluate electroporation parameters and optimize DNA delivery conditions into strawberry protoplasts. Optimal GUS-activity was obtained when protoplasts were subjected to 400 V/cm for 20 ms. GUS-activity could be further increased by the addit