Embryonic origin of the Arabidopsis primary root and root meristem initials

摘要: The embryonic origin of the Arabidopsis root and hypocotyl region has been investigated using histological techniques clonal analysis. Our data reveal pattern cell division in embryo giving rise to various initials within promeristem. A small at its connection with appears not be derived from promeristem initials. This contains two cortical layer [3H]thymidine incorporation suggest that it lacks postembryonic divisions. Sectors marked by transposon excision beta-glucuronidase marker gene are used investigate lineages hypocotyl. position end points sectors show little variation hence preferred positions seedling for cells different regions embryo. radial extent complete is consistent arrangement meristem heart stage embryogenesis inferred Using data, a fate map constructed depicting destiny tiers, variability sector indicates distinct restricted or fate. In contrast, derivatives hypophyseal do appear columella central root.