Pattern analysis of stem cell differentiation during in vitro Arabidopsis organogenesis

Plant somatic cells have the capability to switch their cell fates from differentiated to undifferen-tiated status under proper culture conditions,which is designated as totipotency.As a result,plant cells can easily regenerate new tissues or organs from a wide variety of explants.However,the mechanism by which plant cells have such remarkable regeneration ability is still largely unknown.In this study,we used a set of meristem-specific marker genes to analyze the patterns of stem cell differentiation in the processes of somatic embryogenesis as well as shoot or root organogenesis in vitro.Our studies furnish preliminary and important information on the patterns of the de novo stem cell differentiation during various types of in vitro organogenesis.