Seed morphology and seed coat anatomy of Fraxinus , Ligustrum and Syringa (Oleeae: Oleaceae) and its systematic implications

2018 ◽  
Vol 36 (10) ◽  
pp. e01866 ◽  
Author(s):  
Balkrishna Ghimire ◽  
Mi Jin Jeong ◽  
Gang Uk Suh ◽  
Kweon Heo ◽  
Cheul Ho Lee
Keyword(s):  
Seed Coat ◽  
Seed Morphology

Morphology and Affinities of Ampelocissites Seeds (Vitaceae: Ampelopsis clade) from the Paleogene of Texas, USA

2020 ◽  
Vol 45 (3) ◽  
pp. 478-482
Author(s):  
Steven R. Manchester
Keyword(s):  
Computed Tomography ◽  
Cross Sections ◽  
Seed Coat ◽  
Ct Scanning ◽  
Seed Morphology ◽  
Early Eocene ◽  
Micro Computed Tomography ◽  
X Ray ◽  
Fossil Seeds ◽  
Fossil Genus

Abstract—The type material on which the fossil genus name Ampelocissites was established in 1929 has been reexamined with the aid of X-ray micro-computed tomography (μ-CT) scanning and compared with seeds of extant taxa to assess the relationships of these fossils within the grape family, Vitaceae. The specimens were collected from a sandstone of late Paleocene or early Eocene age. Although originally inferred by Berry to be intermediate in morphology between Ampelocissus and Vitis, the newly revealed details of seed morphology indicate that these seeds represent instead the Ampelopsis clade. Digital cross sections show that the seed coat maintains its thickness over the external surfaces, but diminishes quickly in the ventral infolds. This feature, along with the elliptical chalaza and lack of an apical groove, indicate that Ampelocissites lytlensis Berry probably represents Ampelopsis or Nekemias (rather than Ampelocissus or Vitis) and that the generic name Ampelocissites may be useful for fossil seeds with morphology consistent with the Ampelopsis clade that lack sufficient characters to specify placement within one of these extant genera.

Seed morphology and ultrastructure in Citrus garrawayi (Rutaceae) in relation to germinability

2007 ◽  
Vol 55 (6) ◽  
pp. 618 ◽  
Author(s):  
Kim N. Hamilton ◽  
Sarah E. Ashmore ◽  
Rod A. Drew ◽  
Hugh W. Pritchard
Keyword(s):  
Moisture Content ◽  
Seed Size ◽  
Seed Coat ◽  
Outer Integument ◽  
Dry Weight ◽  
Seed Morphology ◽  
Embryonic Axis ◽  
Morphological Development ◽  
Seed Moisture Content ◽  
Immature Seeds

Combinational traits of seed size and seed-coat hardness in Citrus garrawayi (F.M.Bailey) (syn. of Microcitrus garrowayi) were investigated as markers for estimation of seed morphological and physiological maturity. Seed size (length) and coat hardness correlated well with changes in seed coat and embryo morphological development, dry-weight accumulation, decreases in moisture content and a significant increase in germinability. Seed moisture content decreased from 82 ± 1% in immature seeds to 40 ± 1% at seed maturation. The outer integument of immature seeds consisted of thin-walled epidermal fibres from which outgrowths of emerging protrusions were observed. In comparison, mature seed coats were characterised by the thickening of the cell walls of the epidermal fibres from which arose numerous protrusions covered by an extensive mucilage layer. Immature seeds, with incomplete embryo and seed-coat histodiffereniation, had a low mean germination percentage of 4 ± 4%. Premature seeds, with a differentiated embryonic axis, were capable of much higher levels of germination (51 ± 10%) before the attainment of mass maturity. Mature seeds, with the most well differentiated embryonic axis and maximum mean dry weight, had the significantly highest level of germination (88 ± 3%).

scholarly journals Seed micromorphological study on endemic and subendemic species of Veronica L. (Plantaginaceae Juss.) in Iran

2019 ◽  
Vol 26 (2) ◽  
pp. 315-324
Author(s):  
Soghra Ramzi ◽  
Shahryar Saedi-Mehrvarz
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Seed Coat ◽  
Seed Morphology ◽  
Seed Shape ◽  
Sem Micrographs ◽  
Qualitative And Quantitative ◽  
Quantitative Characters ◽  
Micromorphological Characters ◽  
Scanning Electron

Seed morphology of 12 Iranian endemic and subendemic species of Veronica was studied using scanning electron microscope (SEM). Seven qualitative and quantitative characters were measured using SEM micrographs and stereomicroscopy. The seed shape of most species is ovate and plano-convex. The size of seeds ranges from 1.25 x 0.75 mm in V. khorassanica to 2.5 x 1.75 mm in V. viscosa Boiss. The ornamentation of seed coat is reticulate-verrucate in V. khorassanica, V. czerniakowskiana, V. mazanderanae and V. rubrifolia, reticulate-rugate in V. acrotheca, V. aucheri, V. viscosa and V. intercedens, rugose in V. microcarpa, V. chionantha and V. rechingeri, and reticulate-porate in V. gaubae. The testa cells are polygonal in ten species and irregular in two species. Micromorphological characters of seeds are useful in specific and subspecific delimitations of Iranian Veronica.

scholarly journals Seed morphology and anatomy of Hypericum elegans Steph. ex Willd.

2014 ◽  
Vol 35 (1) ◽  
pp. 15-18
Author(s):  
Piotr Szkudlarz
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Eastern Europe ◽  
Seed Coat ◽  
Central And Eastern Europe ◽  
Seed Morphology ◽  
Seed Sample ◽  
Cell Layers ◽  
Mature Seeds ◽  
Scanning Electron

Abstract Hypericum elegans is a rare perennial distributed primarily in Central and Eastern Europe. Seed morphology and anatomy in H. elegans was studied on the basis of a seed sample from its only locality in Poland. Scanning electron microscopy revealed that the seed coat of mature seeds is composed basically of 3 cell layers: epidermal, subepidermal and sclerenchymatic. They are documented graphically here.

scholarly journals Morphological characters of the seed coat in selected species of the genus Hypericum L. and their taxonomic value

2016 ◽  
Vol 44 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Piotr Szkudlarz ◽  
Zbigniew Celka
Keyword(s):  
Seed Coat ◽  
Morphological Characters ◽  
Seed Morphology ◽  
Epidermal Cells ◽  
Published Data ◽  
Sem Images ◽  
Final Development ◽  
Length Width ◽  
Quantitative Analyses ◽  
Hypericum Species

Abstract Eight Hypericum species are native to Poland: H. elegans Stephan ex Willd., H. hirsutum L., H. humifusum L., H. maculatum Crantz, H. montanum L., H. perforatum L., H. pulchrum L., and H. tetrapterum Fr. Only seeds of H. elegans were investigated in detail in Poland before, so here we present results of qualitative and quantitative analyses of seed morphology of the other 7 species, based on characters like seed length, width, and shape, seed coat sculpture, shape of epidermal cells of the testa, and number of epidermal cells along the seed axis. The results show that seeds of the studied species are small, 0.56-1.15 mm long and 0.26-0.49 mm wide. In SEM images, seed coat sculpture is reticulate in 5 species, papillate in H. hirsutum, and cup-shaped in H. pulchrum. The differences are caused by the varied final development of the testa epidermis, which constitutes the outer layer of the seed coat. The mean number of epidermal cells along the seed axis ranges from 22 to 33. Results of cluster analysis, based on the agglomeration method and including also published data on seeds of H. elegans, show that the variation in the investigated characters of seeds is reflected in the taxonomic division of the genus into sections.

scholarly journals Seed morphometric characteristics of European species of Elatine (Elatinaceae)

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3399 ◽  
Author(s):  
Agnieszka Popiela ◽  
Andrzej Łysko ◽  
Bożenna Białecka ◽  
Magdalena Marta Bihun ◽  
Gábor Sramkó ◽  
...  
Keyword(s):  
Seed Coat ◽  
Morphological Variability ◽  
Seed Morphology ◽  
Morphometric Study ◽  
Individual Species ◽  
Morphometric Characteristics ◽  
European Species ◽  
Object A ◽  
Interspecific Differences ◽  
High Degree

Elatine L. contains ca. 25 small, herbaceous, annual species distributed in ephemeral waters in both hemispheres. All species are amphibious and characterized by a high degree of morphological variability. The importance of seed morphology in Elatine taxonomy has been emphasized by many authors. The degree of seed curvature and seed coat reticulation have been traditionally considered very important in recognizing individual species of this genus. Seed morphometric characteristics of 10 Elatine species, including all European native taxa, are provided on the basis of material from two or three populations of each species. A total of 24–50 seeds were studied from each population, altogether 1,260 images were used for the morphometric study. In total, six parameters were measured from SEM pictures: object surface area, profile specific perimeter (object circuit), rectangle of the object (a) length, rectangle of the object (b) width, angle of the seed curvature, and number of pits in the seed coat counted in the middle row. Our study shows that the range of morphological variation of seeds in European species of Elatine is great, both between the species and the populations. Discrimination analysis showed that all six traits significantly differentiate the populations studied (λ = 0.001, p < 0.001), and the greatest contributions were “number of pits”, “rectangle_a”, and “the angle curvature”. Multidimensional scaling based on a correlation matrix of Mahalanobis distance of the six features studied revealed the greatest similarity between the three populations of E. alsinastrum, E. macropoda, and E. hexandra. Regarding interspecific differences, a Kruskal–Wallis tests showed that, in many cases, lack of statistically significant differences between species relative to the studied seed traits. If distinction of species is only based on seeds, especially if only a few seeds are evaluated, the following species pairs can be easily confused: E. alsinastrum and E. orthosperma, E. hexandra and E. macropoda, E. campylosperma and E. hydropiper, as well and E. gussonei and E. hungarica. We found no diversity in seed coat micromorphology within pits that could have potential taxonomic importance. An identification key and descriptions of species are provided on the basis of seeds traits.

scholarly journals Allometric relationships between diaspore morphology and diaspore covering anatomy of herbaceous species from central-eastern Europe

2016 ◽  
Vol 26 (3) ◽  
pp. 264-272
Author(s):  
Thomas Kuhn ◽  
Enikő I. Fodor ◽  
Septimiu Tripon ◽  
László Fodorpataki ◽  
Annamária Fenesi ◽  
...  
Keyword(s):  
Seed Coat ◽  
Morphological Characteristics ◽  
Soil Surface ◽  
Protective Role ◽  
Seed Morphology ◽  
Herbaceous Species ◽  
Central Eastern Europe ◽  
Long Time ◽  
Central Eastern ◽  
Ecological Importance

AbstractAnatomical and morphological seed traits are of great ecological importance and are a main subject of, for example, seed bank or endozoochory studies. However, we observed a lack of information about the relationship between seed anatomy and seed morphology and its ecological implications. To fill this gap, we linked the anatomical features of diaspore coverings to morphological characteristics of free seeds and one-seeded fruits. We predicted that: (1) the thickness and anatomical complexity of seed coat and pericarp are related to diaspore size and shape; and (2) the presence or absence of the pericarp may influence seed-coat thickness and anatomy. In our study we investigated diaspores of 39 central-eastern European herbaceous species and recorded the thickness and anatomical complexity of their seed coverings, and we determined diaspore mass and shape. Our results indicate that diaspore mass is positively related to covering thickness, lignification degree and anatomical complexity. This might be the case because bigger diaspores tend to remain on the soil surface and are more exposed to predation risk and environmental threat than smaller diaspores. Furthermore, more round-shaped diaspores had disproportionately thicker and more lignified coverings than long or flat ones, probably because round-shaped diaspores much more frequently form seed banks and therefore persist for a long time in the soil. We also found that free seeds as diaspores have a thicker and more lignified seed coat than seeds enclosed in fruits. In one-seeded fruits, the pericarp ‘takes the protective role’, it is thick, and the seed coat is poorly developed.

Contrasting seed morphology dynamics in relation to the alleviation of dormancy with soil storage

2000 ◽  
Vol 78 (9) ◽  
pp. 1187-1198 ◽  
Author(s):  
Anle Tieu ◽  
Louise M Egerton-Warburton
Keyword(s):  
Seed Coat ◽  
Seed Morphology ◽  
Environmental Cues ◽  
Significant Deterioration ◽  
Soil Burial ◽  
Soil Storage ◽  
Physiological Dormancy ◽  
Fruit Wall ◽  
Species Specific ◽  
Seed Coat Morphology

We examined the effect of prolonged (up to 450 days) soil burial in the field on seed morphological traits (seed coat structure, permeability) to identify their potential roles in seed dormancy and release. Such traits were examined in species with seeds that demonstrated an obligate requirement for soil storage before germination: the dormant seeds of Anigozanthos manglesii D. Don, Conostylis neocymosa Hopper, Stylidium affine Sonder, and Stylidium crossocephalum F. Muell., and the deeply dormant fruits of Leucopogon conostephioides D.C. We detected species-specific and environmentally induced variation in seed morphology following soil burial. In A. manglesii and L. conostephioides, a significant deterioration of the seed coat or fruit wall and an increased permeability of the seed coat to water and solutes were correlated with germination responses. In these species, the seed coat and (or) fruit wall delayed germination until (morpho) physiological dormancy was broken. In C. neocymosa, S. affine, and S. crossocephalum, weathering of the seed coat, permeability, and germination were not correlated traits. These species appeared to possess physiological dormancy mechanisms and required environmental cues for dormancy release.Key words: physiological dormancy, soil burial, seed coat, morphology.

The seed morphology and anatomy of the allium anisopodium on the seed genebank

2018 ◽  
Vol 22 (03) ◽  
pp. 69-71
Author(s):  
Binderya G ◽  
Tumenjargal D
Keyword(s):  
Seed Size ◽  
Seed Coat ◽  
Seed Weight ◽  
Longitudinal Section ◽  
Seed Morphology ◽  
Anatomical Structure ◽  
Seed Type ◽  
Seed Shape ◽  
Seed Surface ◽  
Thousand Seed Weight

The paper presents the results of the study on seed morphology and anatomy of Allium anisopodium Ldb. The seed shape is elliptic, glossy-black in color. The seed surface is scaly and its hilum appears in white color. The seed size is 1.7-2.1 mm long, 1.2-1.4 wide, 0.5-2.1 mm in thick and one thousand seed weight is 1.9 g. The anatomical structure is endospermic one cotyledons seed type. The seed coat thin and cotyledon is emphasized apparently from longitudinal section. The embryo is curved, coiled and black colored embryonic roots are relatively thick. The endosperm is surrounded by seed coat moreover between the cotyledon and embryo.

scholarly journals Pericarp, seed coat anatomy and seed morphology of Calycanthaceae

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Niroj Paudel ◽  
Kweon Heo
Keyword(s):  
Light Microscopy ◽  
Seed Coat ◽  
Anatomical Study ◽  
Seed Morphology ◽  
Phylogenetic Significance ◽  
The Family ◽  
Trichome Morphology

Pericarp, trichome, and seed coat anatomy display great features of taxonomic value in the Calycanthaceae. The present study about trichome and seed coat anatomy has based on external and internal observation. Detail anatomical study of seeds provides valuable information for further study about their function, ontogeny, and phylogeny. Therefore, the goal of the study is to investigate trichome morphology and seed coat anatomy in Calycanthaceae to provide more detail characterization. Seeds were collected after that preserved with FAA. Furthermore, alcohol series applied for SEM and light microscopy. The unicellular trichome morphology is common in all species in Calycanthaceae. Density of trichome is highest in Calycanthus occidentalis. Different variation of seed coat and pericarp layers are characteristics of potential phylogenetic significance in the family.

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