scholarly journals Achene micromorphology of seven taxa of Achillea L. (Asteraceae) from Turkey

2014 ◽  
Vol 21 (1) ◽  
pp. 19-25 ◽  
Author(s):  
Tulay Aytas Akcin ◽  
Adnan Akcin
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Cell Distribution ◽  
Plant Taxon ◽  
Micromorphological Characters ◽  
Scanning Electron

Micromorphological characters of achenes in seven taxa of Turkish Achillea L. (Asteraceae) were investigated using stereomicroscope and scanning electron microscope (SEM). Some morphological descriptions of achenes were given for each species. A.biserrata Bieb. has the biggest (0.69±0.092 x 2.01±0.252 mm) and A. grandiflora Friv. has the smallest (0.30±0.018 x 1.12±0.058 mm) achenes. The achenes are oblong-lanceolate in A.biserrata and A. teretifolia Willd. and they are oblong in the remaining taxa. In surface sculpturing, the ornamentation and slime cell distribution varied among the taxa. However, A. biebersteinii Afan. has distinct slime cells forming groups scattered over the achene surface. Mature achenes are ribbed and glabrous in all studied taxa. A. biserrata has distinct carpopodium structure.DOI: http://dx.doi.org/10.3329/bjpt.v21i1.19253Bangladesh J. Plant Taxon. 21(1): 19-25, 2014 (June)

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 Taxonomic significance of spermoderm pattern in Cucurbitaceae

2013 ◽  
Vol 20 (1) ◽  
pp. 61-65
Author(s):  
M. Ajmal Ali ◽  
Fahad M.A. Al-Hemaid ◽  
Arun K. Pandey ◽  
Joongku Lee
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Cucumis Melo ◽  
Taxonomic Significance ◽  
Citrullus Colocynthis ◽  
Benincasa Hispida ◽  
The Family ◽  
Plant Taxon ◽  
Relationship Of ◽  
Scanning Electron

Studies on spermoderm using scanning electron microscope (SEM) were undertaken in 12 taxa under 11 genera of the family Cucurbitaceae sampled from India, China and Korea. The spermoderm pattern in the studied taxa varies from rugulate, reticulate to colliculate type. The spermoderm shows rugulate type in Benincasa hispida and Sicyos angulatus; reticulate type in Citrullus colocynthis, Cucumis melo var. agrestis, Diplocyclos palmatus, Hemsleya longivillosa, Luffa echinata, Momordica charantia, M. cymbalaria, Schizopepon bryoniifolius, and Trichosanthes cucumerina; and colliculate type  in Gynostemma laxiflorum. The present study clearly reveals that the testa features greatly varies across the genera which can be used as micromorphological markers for identification as well as character states for deducing relationship of the taxa within the family.DOI: http://dx.doi.org/10.3329/bjpt.v20i1.15465Bangladesh J. Plant Taxon. 20(1): 61-65, 2013 (June)

SEM and stereoscope microscope observations on the seeds of some Ornithogalum (Hyacinthaceae) species

Biologia ◽  
2008 ◽  
Vol 63 (5) ◽  
Author(s):  
Leszek Bednorz ◽  
Aneta Czarna
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Morphological Characters ◽  
Seed Morphology ◽  
Similar Species ◽  
Specific Level ◽  
Seed Surface ◽  
Taxonomic Criterion ◽  
Micromorphological Characters ◽  
Scanning Electron

AbstractThe paper presents the results of the study on seed morphology of four following Ornithogalum species: O. boucheanum Asch., O. nutans L., O. pyrenaicum L., and O. umbellatum L. Several macro-and micro-morphological characters were observed using stereoscope and scanning electron microscope. Differences were found especially in micromorphological characters of the seed surface, the shape of raphe and micropylar pole. These characters can be used as an additional taxonomic criterion at specific level for this genus. Only the seeds of O. boucheanum and O. nutans — two closely related and morphologically very similar species are practically undistinguished.

scholarly journals Anatomy of the Southern African Boerhavia and Commicarpus species (Nyctaginaceae)

1970 ◽  
Vol 18 (2) ◽  
pp. 105-115 ◽  
Author(s):  
Madeleen Struwig ◽  
Anine Jordaan ◽  
Stefan J. Siebert
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Research Needs ◽  
Generic Level ◽  
Kranz Anatomy ◽  
Parenchyma Cells ◽  
Plant Taxon ◽  
Stem Leaf ◽  
Scanning Electron

The Nyctaginaceae in southern Africa is represented by five genera of which Boerhavia L. and Commicarpus Standl. are the most species-rich. Stem, leaf and anthocarp material was collected in situ and examined with a scanning electron microscope and a light microscope. The anatomy of the leaf and anthocarp proved diagnostic at the generic level, but was uniform amongst the species of each genus. Kranz anatomy occurs around the minor veins in the leaves of Boerhavia, but in Commicarpus the minor veins are surrounded by large parenchyma cells. The anthocarp of Boerhavia has five ribs or three wings, with sclerenchyma within the ribs and the area between the ribs, whereas Commicarpus has ten ribs with sclerenchyma only present within the ribs. The number of chlorenchyma rows in the stems could be diagnostic and the outline of the sclerenchyma bundles in the anthocarp could divide the Commicarpus species into two groups, but more research needs to be done on these characters.Keywords: Stem; Leaf; Anthocarp; Trichomes; Kranz anatomy; Light microscopy.DOI: http://dx.doi.org/10.3329/bjpt.v18i2.9297Bangladesh J. Plant Taxon. 18(2): 105-115, 2011 (December)

Carex huangshanica (sect. Rhomboidales, Cyperaceae), a new species from Anhui, eastern China

Phytotaxa ◽  
2015 ◽  
Vol 233 (3) ◽  
pp. 281
Author(s):  
WEI-JIE CHEN ◽  
Xiao-Feng Jin
Keyword(s):  
Electron Microscope ◽  
New Species ◽  
Scanning Electron Microscope ◽  
Epidermal Cell ◽  
Eastern China ◽  
Anhui Province ◽  
Silica Body ◽  
Micromorphological Characters ◽  
A New Species ◽  
Scanning Electron

Carex huangshanica X. F. Jin & W. J. Chen, a new species from Anhui Province of eastern China, is described and illustrated. It belongs to Carex sect. Rhomboidales and resembles C. longirostrata in having perigynia gradually contracted into a long beak at apex; orifice 2-lobed with long teeth; achenes abruptly contracted into a beak at apex. It differs from C. longirostrata in having upper spikes aggregated, pistillate scales shortly awned at apex, perigynia nearly glabrous, and achenes ovoid. Micromorphological characters of the perigynia and achenes under scanning electron microscope are compared between the new species and C. longirostrata. Carex huangshanica has glabrous perigynia (vs. pubescent perigynia in C. longirostrata), achenes abruptly contracted in a short curved beak at apex, and only one silica body is present in each epidermal cell (vs. achenes of C. longirostrat that are contracted in a short coiled beak at apex, and without silica body in epidermal cells).

scholarly journals A new infra-specific taxon of Acalypha fimbriata Schum. & Thonn. from Nigeria

2014 ◽  
Vol 21 (1) ◽  
pp. 53-62
Author(s):  
Akeem Babalola Kadiri
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Type Specimen ◽  
Reproductive Organs ◽  
The Other ◽  
New Taxon ◽  
Scatter Diagram ◽  
Upgma Dendrogram ◽  
Plant Taxon ◽  
Scanning Electron

This study shows that the populations of Acalypha fimbriata Schum. & Thonn. occurring in Nigeria are divisible into two recognizable varieties, viz., A. fimbriata Schum. & Thonn. var. fimbriata and A. fimbriata var. robusta Kadiri var. nov. Generally, the populations have a suite of similar characters in their vegetative and reproductive organs and the ultra-structures of the leaf cuticle using scanning electron microscope showed uniformity of characters like sunken stomata, wide-narrow stomatal opening and conspicuous periclinal wall. However, the two varieties are discriminated based on 1 vs. 2 fruits per bract, slim vs. robust stature, scanty vs. clumsy inflorescence on the axillary spike, leaf apex character as well as smooth and rough unicellular trichomes. The observation is supported by a T-test at 95% similarity confidence while the 14 populations consisting of 280 individuals used for the analysis are separated into two by the scatter diagram. Neighbour joining analysis using Euclidean measure and UPGMA dendrogram reveal the level of relationships. Therefore, one of the varieties is based on the description of the earlier described type specimen and the other variety being different is considered as a new taxon Acalypha fimbriata var. robusta Kadiri.DOI: http://dx.doi.org/10.3329/bjpt.v21i1.19265Bangladesh J. Plant Taxon. 21(1): 53-62, 2014 (June)

Inner surface sculpture patterns of cuticles in Cupressaceae

1983 ◽  
Vol 61 (4) ◽  
pp. 1222-1231 ◽  
Author(s):  
F. A. Oladele
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Taxonomic Significance ◽  
Generic Level ◽  
Surface Sculpture ◽  
The Family ◽  
Inner Surface ◽  
Micromorphological Characters ◽  
Scanning Electron

Chemically and enzymatically isolated cuticles in the family Cupressaceae were examined with a scanning electron microscope (SEM). The inner surface of the cuticles has many micromorphological characters which show interspecific and intergeneric variations. Those above the generic level are less apparent. Taxonomic significance of the sculpture patterns is discussed.

The Alteration of the Pore Spaces in Sandstones

1973 ◽  
Vol 31 ◽  
pp. 210-211
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Coarse Grained ◽  
Depositional Fabric ◽  
Soluble Components ◽  
Scanning Electron ◽  
Shape And Size

The pore spaces in sandstones are the result of the original depositional fabric and the degree of post-depositional alteration that the rock has experienced. The largest pore volumes are present in coarse-grained, well-sorted materials with high sphericity. The chief mechanisms which alter the shape and size of the pores are precipitation of cementing agents and the dissolution of soluble components. Each process may operate alone or in combination with the other, or there may be several generations of cementation and solution.The scanning electron microscope has ‘been used in this study to reveal the morphology of the pore spaces in a variety of moderate porosity, orthoquartzites.

The Broad Applications of the Scanning Electron Microscope

1969 ◽  
Vol 27 ◽  
pp. 20-21
Author(s):  
C. T. Nightingale ◽  
S. E. Summers ◽  
T. P. Turnbull
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscopy ◽  
Surface Topography ◽  
Great Depth ◽  
Resolving Power ◽  
Depth Of Field ◽  
Pictorial Representations ◽  
Scanning Electron

The ease of operation of the scanning electron microscope has insured its wide application in medicine and industry. The micrographs are pictorial representations of surface topography obtained directly from the specimen. The need to replicate is eliminated. The great depth of field and the high resolving power provide far more information than light microscopy.

Observability of Very Thick Specimen by Using Transmission Scanning Electron Microscope

1971 ◽  
Vol 29 ◽  
pp. 26-27
Author(s):  
K. Shibatomi ◽  
T. Yamanoto ◽  
H. Koike
Keyword(s):  
Electron Microscope ◽  
Image Quality ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Image Contrast ◽  
Objective Lens ◽  
Thick Specimen ◽  
Transmission Electron ◽  
Scanning Electron

In the observation of a thick specimen by means of a transmission electron microscope, the intensity of electrons passing through the objective lens aperture is greatly reduced. So that the image is almost invisible. In addition to this fact, it have been reported that a chromatic aberration causes the deterioration of the image contrast rather than that of the resolution. The scanning electron microscope is, however, capable of electrically amplifying the signal of the decreasing intensity, and also free from a chromatic aberration so that the deterioration of the image contrast due to the aberration can be prevented. The electrical improvement of the image quality can be carried out by using the fascionating features of the SEM, that is, the amplification of a weak in-put signal forming the image and the descriminating action of the heigh level signal of the background. This paper reports some of the experimental results about the thickness dependence of the observability and quality of the image in the case of the transmission SEM.

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