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Seed Characters (seed + character)

Distribution by Scientific Domains

Life Sciences	100%

Selected Abstracts

Seed characters and testa sculptures of some Iranian Allium L. species (Alliaceae)

FEDDES REPERTORIUM, Issue 5-6 2009
Fatemeh Neshati
Seeds taken from herbarium specimens of 20 Allium taxa were investigated. The seeds of all species were black ranging from 1.7 mm (A. lamondiae) to 4 mm (A. altissimum and A. stipitatum) in length and 1 mm (A. lamondiae) to 3 mm (A. altissimum) in width. So, A. lamondiae had the smallest and A. altissimum the largest seeds. In the mean, the members of subg. Melanocrommyum had somewhat larger and the species of sect. Avulsea somewhat smaller seeds than most species belonging to other groups. The shape was generally ovate or variants of it and showed only slight differences between members of different sections. The seed coat pattern was more variable. Most common were convex, granulate periclinal walls bearing several verrucae. Only A. borszczowii showed flat, densely granulate periclinal walls without verrucae, and A. bungei and A. joharchii had somewhat verruca-like aggregating grana. The majority of the species investigated showed S-like, rarely Omega-like, undulated anticlinal walls with variable wavelengths and amplitudes. The testa cells of A. joharchii showed transitions to straight anticlinal walls. More or less straight anticlinal walls in A. kopetdagense, A. paradoxum, A. barsczewskii, and A. scabriscapum were connected with the presence of a strip-like widened and transversally striated intercellular region covering these walls. The seed coat pattern of most species corresponded well to earlier reports of the same or closely related species, or was at least already reported for not related Allium species. Only A. borszczowii and A. monophyllum displayed testa types earlier not reported. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Seed morphology of some species of Convolvulaceae from Egypt (Identification of species and systematic significance)

FEDDES REPERTORIUM, Issue 1-2 2007
K. Abdel Khalik
Seed morphology of 31 taxa belong to six genera of Convolvulaceae from Egypt were examined by using light and scanning electron microscopy. Macro- and micromorphological characters, including seed shape, colour, size, surface, epidermal cell shape, anticlinal boundaries, outer periclinal cell wall and relief of outer cell walls, are presented. Three types of basic anticlinal cell wall boundaries and three types of relief outer cell walls are recognized and four different shapes of the outer periclinal cell wall are described. A key for the identification of the investigated taxa based on seed characters is provided. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) Morphologie der Samen einiger Arten der Convolvulaceae aus Ägypten (Bestimmung von Arten und systematische Bedeutung) Unter Anwendung von Licht- und Elektronenmikroskopie wurde die Morphologie der Samen von 31 Arten aus sechs Gattungen der Convolvulaceae untersucht. Berücksichtigt wurden die makro- und mikromorphologischen Merkmale der Samen umfassend äußere Form, Farbe, Größe, Oberfläche, Form der Epidermiszellen, antiklinale und periklinale Zellwände und Relief der äußeren Zellwände. Drei Typen basaler antiklinaler Zellwände und drei Typen des Reliefs der äußeren Zellwände wurden nachgewiesen; ferner werden vier Formen der äußeren periklinalen Zellwände beschrieben. Ein Schlüssel zur Bestimmung der untersuchten Taxa auf der Basis der Merkmale der Samen wird vorgelegt. [source]

Seed morphology of Cuscuta L. (Convolvulaceae) in Egypt and its systematic significance

FEDDES REPERTORIUM, Issue 3-4 2006
K. N. Abdel Khalik
The seed morphology of eight taxa of Cuscuta from Egypt has been studied using light and scanning electron microscopy, to determine the significance of seed coat features as taxonomic characters. Macro- and micromorphological characters, including seed shape, colour, size, epidermal cell shape, anticlinal boundaries, outer periclinal cell wall and relief of outer cell walls are presented. Three types of anticlinal cell wall boundaries are recognized and two different shapes of outer periclinal cell wall are described. The secondary sculpture of the cell wall varies from striate to micro-reticulate, and smooth to fine folds. A key for the identification of the investigated taxa based on seed characters is provided. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) Samenmorphologie von Cuscuta L. (Convolvulaceae) in Ägypten und ihre systematische Bedeutung Die Morphologie des Samens von acht ägyptischen Cuscuta -Taxa wurde mittels Licht- und Elektronenmikroskopie untersucht, um die Bedeutung der Merkmale der Samenschale für die Taxonomie zu ermitteln. Makro- und mikromorphologische Merkmale einschließlich Samengestalt, Farbe, Größe, Form der Epidermiszellen, antiklinale Zellwände, äußere Periklinal-Zellwände und Relief der äußeren Zellwände umfassend, wurden untersucht. Drei Typen antiklinaler Zellwand-Umrisse und zwei unterschiedliche Formen der äußeren Periklinal-Zellwände werden beschrieben. Die sekundäre Skulptur der Zellwände variiert von striat bis mikro-reticulat, und von glatt zu leicht gefaltet. Ein Bestimmungsschlüssel basierend auf den Samenmerkmalen der untersuchten Sippen wird vorgelegt. [source]

A preliminary study of the seed anatomy of Zingiberaceae

BOTANICAL JOURNAL OF THE LINNEAN SOCIETY, Issue 1-2 2000
JING-PING LIAO
Seeds in Zingiberaceae comprise an aril, seed coat, perispenn, endosperm, embryo, and micropylar and chalazal region. The seed coat is derived from the outer integument, and can be divided into cxotesta, mcsotesta and endotesta; the mesotesta is further subdivided into hypodcrmis, translucent cell layer and pigmented cell layer. The micropylar region includes a micropylar collar and operculum; in some taxa it also includes a caruncle-like structure or a stalk-like structure. A chalazal pigmented cell group (CPG), endotcstal gap, diaphragm and the course of raphe bundle in the chalazal region may be of systematic significance in some species. There are two types of endotesta in the family: parenchymatous (in tribes Hedychieae, Zingibereae and Globbeae) and sclerenchymatous (in Alpineae). The exception is Pommereschea lacknen, which is placed in Alpineae but has the parenchymatous type of endotesta. For this and other reasons this taxon should be transferred to another tribe. On the basis of seed characters, Hedychieae, Zingibereae and Globbeae are apparently closely related, although Hedychieae and Zingibereae differ from Globbeae which has a multiple-layered exotestal epidermis. Seeds of most Zingibereae have a peculiar carunclelike structure at the base of the seed which forms the expanding part beyond the micropylar collar. Zingiberaceae and Costaceae are connected through tribe Alpineae with a sclerenchymatous type of endotesta. [source]