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A number of in planta transformation protocols that avoid long culture under sterile conditions were developed for Arabidopsis thaliana. The most widely used methods are based on vacuum infiltration and floral dip. These methods were adapted for transformation of other species as well. Successful in planta transformations of alfalfa, radish, pakchoi and petunia were reported recently. In this short review we present several modified procedures originally developed for Arabidopsis thaliana and in some cases adapted to other species. We emphasize the crucial parameters involved in in planta transformation. We also describe here the studies attempting to shed light on the mechanisms and estimating the cellular target of transformation, which may help in transforming new plant species. [ABSTRACT FROM AUTHOR]