Abstract
Protoplast production with the moss Physcomitrium (Physcomitrella) patens has a long and successful history. As a tool, it has not only been the base of reverse genetic studies covering research fields as diverse as development, metabolism, or gene network regulation but also allowed its development as a bioengineering platform for protein production. We present here a standardized protocol for protoplast production from Physcomitrium (Physcomitrella) patens protonemata. Additionally, we detail procedures for their transfection, their plating for optimal regeneration, and three alternative selection approaches. To improve the consistency of protoplast regeneration, we describe a new option for protoplast embedding. The use of an alginate matrix to regenerate moss protoplast alleviates the use of warm agarized medium. Thus, it optimizes transformed protoplast survival without any morphological detrimental effect or impact on transfection efficiency.
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