caa a22 4500 477111858 CHVBK 20180405111611.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/BF00011652 doi (NATIONALLICENCE)springer-10.1007/BF00011652 Mutational analysis of root initiation in the Arabidopsis embryo [Elektronische Daten] [Thomas Berleth, Christian Hardtke, Gerhard Przemeck, Judith Müller] In dicotyledonous plants, primordia of most seedling organs are laid down between fertilization and the formation of the heart-stage embryo. InArabidopsis embryogenesis, highly regular cell divisions and cell expansions facilitate the characterization of mutant development. We have taken a genetic approach to identify genes involved in organising the hypocotyl/root axis. The initiation of this axis is marked by oriented expansions and longitudinal division of cells in the lower tier of the early globular embryo. These cells go on to form a defined number of parallel cell files that constitute the hypocotyl and most of the radicle. Mutants impaired in the initiation or elaboration of the hypocotyl/root axis were selected by their seedling phenotype and subsequently analysed at embryonic stages. Several conclusions are suggested by the phenotypes of these mutants. First, hypocotyl/root axis formation can be genetically separated from other aspects of embryonic pattern formation. Second, initiation of the hypocotyl/root axis appears to be genetically distinct from post-embryonic root initiation. Third, four loci were identified that appear to contribute to the elaboration of the axial pattern. Finally, an anatomical inspection of one of the mutants, amenable to an analysis at post-embryonic stages, suggests a genetic link between basal pattern formation in the embryo and aspects of vascular differentiation in the adult plant. H Lambers Section editor Kluwer Academic Publishers, 1996 Arabidopsis nationallicence cell axialization nationallicence embryo nationallicence root nationallicence vascular tissues nationallicence Berleth Thomas Genetics Institute, Univ. Munich (LMU), Maria-Ward-Str. 1a, D80638, Munich, Germany aut Hardtke Christian Genetics Institute, Univ. Munich (LMU), Maria-Ward-Str. 1a, D80638, Munich, Germany aut Przemeck Gerhard Genetics Institute, Univ. Munich (LMU), Maria-Ward-Str. 1a, D80638, Munich, Germany aut Müller Judith Genetics Institute, Univ. Munich (LMU), Maria-Ward-Str. 1a, D80638, Munich, Germany aut Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl 187/1(1996-11-01), 1-9 0032-079X 187:1<1 1996 187 11104 https://doi.org/10.1007/BF00011652 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00011652 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Berleth Thomas Genetics Institute, Univ. Munich (LMU), Maria-Ward-Str. 1a, D80638, Munich, Germany aut NATIONALLICENCE 700 1- Hardtke Christian Genetics Institute, Univ. Munich (LMU), Maria-Ward-Str. 1a, D80638, Munich, Germany aut NATIONALLICENCE 700 1- Przemeck Gerhard Genetics Institute, Univ. Munich (LMU), Maria-Ward-Str. 1a, D80638, Munich, Germany aut NATIONALLICENCE 700 1- Müller Judith Genetics Institute, Univ. Munich (LMU), Maria-Ward-Str. 1a, D80638, Munich, Germany aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl/ 187/1(1996-11-01), 1-9 0032-079X 187:1<1 1996 187 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer