caa a22 4500 477111807 CHVBK 20180405111611.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/BF00011660 doi (NATIONALLICENCE)springer-10.1007/BF00011660 Root apical organization in Arabidopsis thaliana ecotype ‘WS' and a comment on root cap structure [Elektronische Daten] [Thomas Rost, Stuart Baum, Susan Nichol] Arabidopsis thaliana roots have closed apical organization with three initial tiers. The dermatogen/calyptrogen tier consists of two parts-the central initials form the columella root cap, and the peripheral initial cells form the protoderm (epidermis) and the peripheral root cap. These peripheral initials divide in a sequence to form a root cap consisting of interconnected cones. the periblem initial tier forms the ground meristem (cortex). For the first week after germination the periblem consists of one layer of initial cells. The peripheral cells of the tier divide periclinally and then anticlinally (a T-division) to form the two-layered cortex (outer cortex and endodermis). After about one week, all the peripheral cells have divided periclinally forming two initials; the outermost produces the outer cortex while the inner initial produces the endodermis and middle cortex layer. The latter two cells arise via a periclinal division. During this time, other cells within the tier divide periclinally to form a two-layered tier. The plerome forms the cells of the procambium (vascular cylinder) by simple anticlinal divisions followed by longitudinal divisions to fill out the cell files of the vascular cylinder. A survey (27 dicot species in 17 families) of roots with closed apical organization revealed that there are three different types of root cap-concentric cylinders of cells (e.g.Linum), interconnecting cones (e.g.Arabidopsis) or overlapping arcs (e.g.Gossypium). H Lambers Section editor Kluwer Academic Publishers, 1996 Arabidopsis nationallicence histogems nationallicence root apical meristem nationallicence root cap nationallicence Rost Thomas Section of Plant Biology, University of California, 95616-8537, Davis, CA, USA aut Baum Stuart Section of Plant Biology, University of California, 95616-8537, Davis, CA, USA aut Nichol Susan Section of Plant Biology, University of California, 95616-8537, Davis, CA, USA aut Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl 187/1(1996-11-01), 91-95 0032-079X 187:1<91 1996 187 11104 https://doi.org/10.1007/BF00011660 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00011660 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rost Thomas Section of Plant Biology, University of California, 95616-8537, Davis, CA, USA aut NATIONALLICENCE 700 1- Baum Stuart Section of Plant Biology, University of California, 95616-8537, Davis, CA, USA aut NATIONALLICENCE 700 1- Nichol Susan Section of Plant Biology, University of California, 95616-8537, Davis, CA, USA aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl/ 187/1(1996-11-01), 91-95 0032-079X 187:1<91 1996 187 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer