Abstract
The moss Physcomitrella patens possesses highly efficient homologous recombination allowing targeted gene manipulations and displays many features of the early land plants including high tolerance to abiotic stresses. It is therefore an invaluable model organism for studies of gene functions and comparative studies of evolution of stress responses in plants. Here, we describe a method for generating targeted gene knockout lines in P. patens using a polyethylene glycol-mediated transformation of protoplasts including basic in vitro growth, propagation, and maintenance techniques.
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