NDLI: Developmental anatomy of the fifth shoot-borne root in young sporophytes of Ceratopteris richardii

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Planta : Volume 219, Issue 1, May 2004

Developmental anatomy of the fifth shoot-borne root in young sporophytes of Ceratopteris richardii

Content Provider	Springer Nature Link
Author	Hou, Gui chuan Hill, Jeffrey P.
Copyright Year	2004
Abstract	Young sporophytes of the homosporous fern Ceratopteris richardii produce a single shoot-borne root below each leaf. The developmental anatomy of the fifth sporophyte root is described using scanning electron microscopy and histological techniques. Three merophyte orthostichies in the body of the root originate from three proximal division faces of a tetrahedral root apical cell. Eight or nine divisions occur in a relatively regular sequence within each merophyte and produce a characteristic radial anatomical pattern in the root. The exact number of early divisions within a merophyte depends on the merophyte’s position within the root as a whole. Predictable inter-merophyte differences arise because a 2-fold (diarch) anatomical symmetry that is characteristic of mature roots is superimposed on a 3-fold radial symmetry that originates behind the apical cell. Before early formative divisions within a merophyte are completed, additional proliferative divisions begin to increase the number of cells within previously established tissue zones. The cellular parameters of early fifth root development in C. richardii are relatively invariant, and are reminiscent of patterns previously described for the heterosporous fern Azolla. Young sporophytes of C. richardii provide a useful model to further investigate the genetic regulation of root development in a non-seed plant, where the anatomy of meristem organization differs from that seen in flowering plant species.
Starting Page	212
Ending Page	220
Page Count	9
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	219
Issue Number	2
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-03-03
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cell lineage Ceratopteris Meristem Merophyte Root apical cell Root development
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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