Seed-coat microsculpturing and its systematic application in Isatis (Brassicaceae) and allied genera in Iran

Autor(en): Moazzeni, Hamid
Zarre, Shahin
Al-Shehbaz, Ihsan A.
Mummenhoff, Klaus 
Stichwörter: Brassicaccae; CHARACTERS; CRUCIFERAE; DNA; Ecology; Environmental Sciences & Ecology; intraspecific classification; Iran; Isatis; PHYLOGENETIC-RELATIONSHIPS; Plant Sciences; RESTRICTION-SITE VARIATION; Sameraria; seed-coat microsculpturing
Erscheinungsdatum: 2007
Enthalten in: FLORA
Band: 202
Ausgabe: 6
Startseite: 447
Seitenende: 454
In order to examine the systematic application of seed-coat microsculpturing in Isatis, seed surfaces of 23 species (41 populations) in four genera of tribe Isatideae were examined using scanning electron microscopy (SEM). Eight types of basic ornamentation patterns were recognized among the studied specimens. Of these, the reticulate-areolate type was the most common and was found in the genera Isatis, Pachypterygium, Samerari and Tauscheria and 15 species (e.g., I. cappodocica, I. kotschyana and I. tinctoria). The reticulate type, the second most frequent, occurred in 7 species while other types each were represented by only one or 2 species. Although different populations of a given species show similar seed-surface sculpturing in most cases, in some polymorphic species like I. cappadocica and I. kotschyana these patterns were variable among populations. To some extent the variation corresponds to infraspecific taxa for some species, but the differences are not significant enough to be useful in the delimitation of the Subspecies recognized by previous workers. Moreover, seed-coat characters do not support the separation of genera Isatis, Pachypterygium, Sameraria and Tauscheria. (c) 2007 Elsevier GmbH. All rights reserved.
ISSN: 03672530
DOI: 10.1016/j.flora.2006.10.004

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