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Seed Shape (seed + shape)

Distribution by Scientific Domains

Life Sciences	100%

Selected Abstracts

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]

Ecological correlates of seed survival after ingestion by Fallow Deer

FUNCTIONAL ECOLOGY, Issue 2 2005
A. MAARTEN MOUISSIE
Summary 1The survival and retention of seeds was studied by feeding known quantities of seeds of 25 species to four captive Fallow Deer (Dama dama L.). To test for ecological correlates, plant species were selected to represent large variation in seed size, seed shape, seed longevity and habitat fertility. 2Seeds of 24 out of 25 fed plant species survived ingestion and defecation by Fallow Deer. Seed survival ranged between 0·5 and 42% of germinable seeds fed. Time to recover 50% of all seeds defecated by Fallow Deer in faeces averaged 25 h, and ranged from 13 to 38 h. 3Seed survival was negatively related to seed mass (R = 0·65) and variance of unit seed dimensions (R = ,0·56), and positively related to seed longevity (R = 0·40), but not related to habitat fertility. Log10 of (seed mass × variance of seed dimensions) was the best predictor of seed survival (R = ,0·68). 4The ecological correlates of seed survival presented here can help us to estimate the ability of plant species to disperse seeds over long distances. [source]

Morphometric differentiation between populations of Papaver radicatum (Papaveraceae) in northern Scandinavia

BOTANICAL JOURNAL OF THE LINNEAN SOCIETY, Issue 3 2000
EVA SELIN
The pattern of morphological variation was investigated in isolated northern Scandinavian populations of Papaucr radicatum, a perennial species with a disjunct distribution in the Scandinavian mountain range, Iceland and the Farces. Canonical variates analysis and Ward's clustering were applied to data sets from wild-collected seed and capsule material, and from cultivated leaf mated from seven populations of P. radicatum in northern Scandinavia, usually assigned to the sspp. subglobosum, hyperboreum and macrostigma. Automatized image acquisition and shape description techniques were used to describe variation in seed shape. The present study supports the multivariate analyses obtained with the southern Norwegian P. radicatum populations in that some of the assumed subspecies show inter-population variation and are not well delimited. In the analyses of capsule and seed morphology as well as leaf morphology, the populations of the sspp. hyperboreum and macrostigma are grouped together. Previous studies of chromosomal and morphological variation in southern Norwegian P. radicatum suggested that the degree of interracial differentiation was similar between all races regardless of their degree of geographic separation. The pattern of differentiation has been taken as a support of in Situ refugial survival during the Weichselian glaciation. As in similar multivariate analyses of southem Norwegian P. radicatum, the multivariate analyses of northern Scandinavian P. radicatum do not confirm such a scenario. The results rather point to the possibility that populations from the sspp. hyperboreum and macrostigna complex were separated during the post-glacial hypsithemal. The morphologically distinct ssp. subglobosum could have been isolated at an earlier stage. [source]