Pollen morphology of the Rosaceae of western Canada. II. Dryas, Fragaria, Holodiscus

1988 ◽  
Vol 66 (4) ◽  
pp. 595-612 ◽  
Author(s):  
R. J. Hebda ◽  
C. C. Chinnappa ◽  
B. M. Smith
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Pollen Morphology ◽  
Silicone Oil ◽  
Pollen Grains ◽  
Western Canada ◽  
Dryas Octopetala ◽  
Fragaria Virginiana ◽  
Fragaria Species ◽  
Scanning Electron

Morphology and geographic variation of pollen grains of three genera of the Rosaceae (Dryas, Fragaria, Holodiscus) of western Canada were studied using the light microscope and scanning electron microscope. Dryas spp. pollen is tricolporate with a weakly developed fusiform aperture in the colpus, which upon expansion of the grain becomes a large rectangular opening. Sculpturing consists of ridges and valleys (striate or rugulate), the latter containing perforations, which grades to a network of ridges and perforations (reticulate) at colpus margins. Ridges are parallel to the colpus or form looping patterns. Dryas integrifolia and Dryas octopetala pollen in silicone oil usually are larger than those of Dryas drummondii. Fragaria spp. pollen is tricolporate with a well-developed complex equatorial aperture. Fragaria chiloensis and F. vesca exhibit a lobed and equatorially extended endoaperture, which is overarched by sexine. Fragaria virginiana usually has a less distinct endoaperture. Fragaria species have a fusiform colpus operculum. Sculpturing consists of nonasastomosing ridges parallel to the colpus and valleys containing obscure microperforations. Holodiscus discolor pollen is tricolporate. Sculpturing is striate to reticulostriate, consisting of ridges and valleys with perforations. A distinct zone, either lacking ridges or of densely packed ridges, borders the colpus.

Pollen morphology of the Rosaceae of western Canada. III. Geum

1990 ◽  
Vol 68 (6) ◽  
pp. 1369-1378 ◽  
Author(s):  
R. J. Hebda ◽  
C. C. Chinnappa
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Western Canada ◽  
Polar Diameter ◽  
Scanning Electron

Pollen grains of eight species of Geum (Rosaceae) from western Canada were studied in the light microscope and the scanning electron microscope. The taxa included Geum aleppicum, Geum calthifolium, Geum glaciale, Geum macrophyllum, Geum rivale, Geum rossii, Geum schofieldii, and Geum triflorum. All taxa produce pollen grains in monads that are isopolar, radially symmetrical, and predominantly tricolporate. Tetracolporate grains occur especially in Geum rossii and Geum calthifolium. Grains are subspheroidal to subprolate with a circular to subtriangular amb. All taxa exhibit a well-developed chambered aperture formed by overarching pore flaps. Flaps extend over the aperture but do not join to form an equatorial bridge. The chamber of Geum schofieldii is distinct and complex, often extending equatorially along a sinuous path to the adjacent aperture. Exine is tectate, microperforate, with a thin nexine. Sculpturing is striate or occasionally rugulate and consists of ridges and valleys with microperforations on valley floors. Ridges and valleys are oriented predominantly parallel to the colpus but occasionally curve or loop near the poles. Sculpturing of Geum schofieldii pollen, is predominantly striate but exhibits a unique verrucate to rugulate pattern along the equator caused by elaboration of the sexine. Polar diameter varies from ca. 20 μm in Geum macrophyllum to 33 μm in Geum schofieldii. The distinctness of Geum schofieldii pollen supports specific status.

scholarly journals Comparison of pollen morphological structures of some taxa belonging to Asparagus L. and Fritillaria L. (Liliaceae) from Turkey

1970 ◽  
Vol 36 (2) ◽  
pp. 111-120 ◽  
Author(s):  
H Ozler ◽  
S Pehlivan
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Key Words ◽  
Transmission Electron Microscope ◽  
Light Microscope ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Exine Sculpture ◽  
Transmission Electron ◽  
Scanning Electron

Pollen grains of 20 taxa from two genera of the Liliaceae were examined and compared by LM (light microscope), SEM (scanning electron microscope) and pollens of four taxa were also examined with TEM (transmission electron microscope). Pollen grains shed as monads. They are monosulcate and ellipsoidal. Fritillaria crassifolia subsp. crassifolia Freyn & Smt. sometimes sheds the pollen as dyads. Exine is semitectate and the tectum is perforate. Columellae are simplicolumellate. Ectexine is thicker than endexine. Exine sculpture (ornamentation) is reticulate, reticulate-rugulate, rugulate and retipilate in Asparagus pollens and reticulate, suprareticulate, rugulate-reticulate and striate-reticulate in Fritillaria pollens. Sulcus extends from distal to proximal in some pollens of Asparagus and Fritillaria.   Key words: Asparagus, Fritillaria, Liliaceae, Pollen morphology DOI = 10.3329/bjb.v36i2.1498 Bangladesh J. Bot. 36(2): 111-120, 2007 (December)

scholarly journals Pollen morphology of some Allium L. (Lilliaceae) taxa in turkey

1970 ◽  
Vol 39 (1) ◽  
pp. 37-46 ◽  
Author(s):  
H Özler ◽  
S Pehlivan
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Key Words ◽  
Transmission Electron Microscope ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Exine Sculpture ◽  
Transmission Electron ◽  
Scanning Electron

Pollen grains of 16 taxa of Allium L. belonging to sections Rhizirideum G. Don ex Koch., Codonoprasum Reichb. and Allium L. were investigated using light and scanning electron microscope, and pollens of four taxa were also examined with transmission electron microscope. Pollens were monosulcate and ellipsoidal. It was observed that the sulcus extends from distal to proximal in all taxa. The exine was semitectate and the tectum was perforate. Columellae were simplicolumellate. Exine sculpture was striate-perforate, striate-rugulate-perforate and rugulate-perforate. A. albidum Fischer ex Bieb. subsp. caucasicum (Regel) Stearn, A. rupicola Boiss ex Mouterde and A. asperiflorum Miscz. were seen to have an operculum. Key words: Allium; Codonoprasum; Rhizirideum; Alliaceae; Pollen morphology; Turkey DOI: 10.3329/bjb.v39i1.5524Bangladesh J. Bot. 39(1): 37-36, 2010 (June)

scholarly journals Pollen morphology of Plantago species native to Poland and their taxonomic implications

2011 ◽  
Vol 73 (4) ◽  
pp. 315-325 ◽  
Author(s):  
Małgorzata Klimko ◽  
Krystyna Idzikowska ◽  
Mariola Truchan ◽  
Anna Kreft
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Pollen Morphology ◽  
Pore Diameter ◽  
Pollen Grains ◽  
Pollen Grain ◽  
Prolate Spheroidal ◽  
Taxonomic Implications ◽  
Scanning Electron

Pollen grains of 9 species of the genus <em>Plantago</em> (Plantaginaceae), including 8 taxa native to Poland, were observed under a light microscope and a scanning electron microscope. Descriptions of grain sculpture are illustrated only SEM micrographs. The studied pollen grains were medium-sized or small, spherical or prolate spheroidal. Their sculpture was always verrucate with granulation. In the studied taxa, internal apertures had the form of pores. Their number ranged from (4)5-9(14). The pores were scattered on the surface of pollen grains. Identification features of individual taxa include: presence or absence of an annulus around each pore, annulus structure, ornamentation of the pollen grain and operculum, type of aperture membrane, number of internal pores, and pore diameter. We suggest that two new pollen grain types, characteristic of <em>P. intermedia</em> and <em>P. arenaria</em>, should be distinguished, and that <em>P. alpina</em> should be assigned to the <em>P. coronopus</em> type.

Observations on the pollen morphology of Cassytha filiformis (Lauraceae) in India

2019 ◽  
Vol 42 (3) ◽  
pp. 209-211
Author(s):  
Saurabh Sachan ◽  
◽  
S.B. Padal ◽  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
South African ◽  
Light Microscope ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
African Region ◽  
African Species ◽  
Morphological Variations ◽  
Scanning Electron

Genus Cassytha (Lauraceae) is characterized by unigue Pollen morphology. We Prepared strains of C. filiformis following acetolysis method (Ikuse, 1956) for observation under Light Microscope and Scanning Electron Microscope. The present study revealed that the lamellar and scbrate nature of exine are entirely different and attributing to different morphology of pollen grains, especially the shape. This communication provides a comparison of pollen morphology between Indian and South African species filiformis discriminates the morphological variations found among the Indian specimens of C. filiformis from that of South African region.

scholarly journals Pollen morphology of 10 taxa belonging to Prangos Lindl. and Ekimia H. Duman & M.F. Watson (Umbelliferae) from turkey and its taxonomic significance

2009 ◽  
Vol 16 (2) ◽  
pp. 165-174 ◽  
Author(s):  
Sevil Pehlivan ◽  
Birol Baser ◽  
Evren Cabi
Keyword(s):  
Cluster Analysis ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
No Value ◽  
Quantitative Data ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Taxonomic Significance ◽  
Transmission Electron ◽  
Scanning Electron

Pollen grains of nine taxa of Prangos Lindl. and one of Ekimia H. Duman & M.F. Watson (Umbelliferae) were examined with LM (light microscope) and SEM (scanning electron microscope), and of them four with TEM (transmission electron microscope). The quantitative data were also subjected to cluster analysis. The obtained phenogram revealed that Ekimia bornmuelleri (Hub.-Mor. & Reese) H. Duman & M.F. Watson is strictly different from the taxa of Prangos regarding their quantitative pollen profile; except P. ferulacea Lindl., all taxa included in section Intactae formed a cluster together; members of section Meliocarpoides and section Prangos show a closer relationship regarding their pollen features. Exine ornamentations of Prangos and Ekimia are rugulate-striate and are of no value for identification purposes.

scholarly journals Pollen morphology of the genus Oxytropis DC. in Turkey

2013 ◽  
Vol 42 (1) ◽  
pp. 167-174 ◽  
Author(s):  
Talip Ceter ◽  
Seher Karaman Erkul ◽  
Zeki Aytac ◽  
Birol Baser
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Polar Axis ◽  
Taxonomic Implications ◽  
Important Character ◽  
Sem Morphology ◽  
Scanning Electron ◽  
Equatorial Section

Pollen morphology of 11 species of the genus Oxytropis DC. (Fabaceae) distributed in Turkey were examined with light (LM) and scanning electron microscope (SEM). Morphology of pollen grains shows isopolar, radially symmetric, tricolporate, prolate or subprolate, porus shape oblate or operculate and exine subtectate. The size varies with the polar axis from 19.52 - 33.31 ?m and the equatorial axis from 13.50 - 25.82 ?m. There are five ornamentation types: perforate at equatorial section and psilate at polar sections, microreticulate at equatorial sections and psilate at polar sections, microreticulate at equatorial sections and perforate at polar sections, microreticulate at both equatorial and polar sections and perforate at both equatorial and polar sections. Pollen aperture, shape and especially different ornamentation patterns at polar and equatorial section of pollen, as found in this study, appear to be important character. The findings of this study indicate the taxonomic implications of pollen morphology in understanding the similarity and relationships in the genus Oxytropis. DOI: http://dx.doi.org/10.3329/bjb.v42i1.15908 Bangladesh J. Bot. 42(1): 167-174, 2013 (June)

scholarly journals Pollen studies in the genus viola (violaceae) from Iran

2014 ◽  
Vol 73 (1) ◽  
pp. 90-103 ◽  
Author(s):  
Shahryar Saeidi Mehrvarz ◽  
Narjes Yousefi ◽  
Maryam Mohammadi ◽  
Thomas Marcussen
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Polar View ◽  
The Other ◽  
Oblate Spheroidal ◽  
Exine Ornamentation ◽  
Pollen Shape ◽  
Scanning Electron

AbstractPollen morphology of 17 species of Viola representing five sections, Melanium, Plagiostigma, 'Spathulidium' ined., Sclerosium, and Viola, was studied using light and scanning electron microscope. Pollen grains were usually symmetrical, tetrazonocolporate to pentazonocolporate in section Melanium and trizonocolporate to tetrazonocolporate in the other four sections. Pollen shape was circular to subtriangular, tetragonal or pentagonal in polar view and prolate to oblate, spheroidal or pyramidal in equatorial view. Exine ornamentation was granulate, psilate and mostly perforate. The psilate type was only observed in V. modesta.We found heteromorphy in aperture number in V. caspia of section Viola, V. occulta of section Melanium and V. behboudiana of section Sclerosium, which corroborates their higher ploidy than in related species (octoploid versus tetraploid).

Comparative pollen morphology of sect. Quinqueloculares (Campanulaceae) in Turkey

Biologia ◽  
2012 ◽  
Vol 67 (5) ◽  
Author(s):  
Emine Alçitepe
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Scanning Electron

AbstractThe pollen morphology of Turkish species belonging to sect. Quinqueloculares (Boiss.) Phitos (Campanulaceae) were investigated with a light microscope (LM) and scanning electron microscope (SEM). All examined species are endemic, except Campanula crispa Lam. According to the results of this study, pollen grains of the examined taxa were triporate and spheroidal. Their sculpture was spinose and baculate (C. crispa Lam.); spinulose and microperforate (C. tomentosa Lam.); microperforate (C. vardariana Bocquet) or more commonly, microechinate (C. iconia Phitos, C. lyrata Lam. subsp. lyrata, C. hagielia Boiss., C. sorgerae Phitos, C. betonicifolia SM., C. karadjana Bocquet, C. telmessi Hub.-Mor. & Phitos, C. davisii Turrill).

scholarly journals Características palinológicas de las araliáceas de México

2017 ◽  
pp. 117 ◽  
Author(s):  
Victoria Sosa
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Light Microscope ◽  
Pollen Grains ◽  
Point Of View ◽  
Generic Level ◽  
Dichotomous Key ◽  
Pollen Characters ◽  
Scanning Electron

This work studies 17 species of mexican Araliaceae from the palynological point of view belonging to the genera Aralia, Dendropanax, Didymopanax, Redera, Oreopanax y Sciadodendron . All the pollen descriptions are presented at the generic level. The grains were studied based in scanning electron microscope and light microscope. It includes a dichotomous key for the genera grains. The results showed few differences between the pollen grains of the genera although some exine characters are important. Redera and Didymopanax presented an exine semi-tectate and the rest of the genera had tectate-perforate grains. This paper compared also some pollen characters with morphological ones, finding pollen characters considered primitive correlated with characters of primitive Araliaceae groups .

Sign in / Sign up

Export Citation Format

Share Document