scholarly journals Pollen morphology of the genera Irlbachia, Tachia, Voyria and Voyriella (Gentianaceae Juss.) found in the Reserva Florestal Adolpho Ducke (Amazonas, Brazil)

2012 ◽  
Vol 26 (4) ◽  
pp. 916-923 ◽  
Author(s):  
Marcos Gonçalves Ferreira ◽  
Maria Lúcia Absy ◽  
Vânia Gonçalves-Esteves
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Great Variability ◽  
Prolate Spheroidal ◽  
Morphology Study ◽  
Size And Shape ◽  
Oblate Spheroidal ◽  
Large Shape

A pollen morphology study of the Gentianaceae Juss. of Reserva Florestal Adolpho Ducke (Manaus, Brazil) was performed. The pollen grains of the studied species varied morphologically in their pollen units (tetrads or monads), size (small, medium and large), shape (oblate, suboblate, oblate spheroidal, spheroidal, prolate spheroidal and prolate), polarity (heteropolar, isopolar or subisopolar), symmetry (bilateral or radial) and number and type of aperture (3-colporate and 1-3porate). In relation to ornamentation, pollen grains had a sexine that was psilate in the Voyria species, microreticulate in Voyriella parviflora and reticulate heterobrochate in Tachia grandiflora and Irlbachia alata. The exine in I. alata showed great variability in the size and shape of the lumina, in addition to clavae of various sizes in the mesocolpium and apocolpium areas. In Tachia grandiflora, besides to long colpi, the heterobrochate exine demonstrated an increase in the lumina in the mesocolpium areas that decreased considerably in the apocolpium areas. In the species of Voyria, the pollen grains showed differences in shape, polarity and the number of apertures, which were spherical, isopolar and 3-porate in Voyria spruceana; prolate/oval, heteropolar and 1-porate in Voyria tenella; and oblate/elliptical (reniform), heteropolar and 2(3)-porate in Voyria aphylla and Voyria caerulea. The variations in pollen morphology and the peculiar characteristics of the genus suggest that Voyria should be treated as a unique taxon within Gentianaceae.

scholarly journals Relationship between pollen morphology and chromosome numbers in Brazilian species of Lippia L. (Verbenaceae)

2013 ◽  
Vol 85 (1) ◽  
pp. 147-157 ◽  
Author(s):  
Saulo M. Sousa ◽  
Patrícia M.O. Pierre ◽  
Giovana A. Torres ◽  
Lisete C. Davide ◽  
Lyderson F. Viccini
Keyword(s):  
Chromosome Numbers ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Positive Association ◽  
Single Species ◽  
Morphological Data ◽  
Prolate Spheroidal ◽  
Oblate Spheroidal ◽  
Exine Ornamentation ◽  
Different Types

The pollen morphology and exine structure of 17 species of Lippia L. were investigated in this work using light and scanning electron microscopy. Among the species studied, 14 showed tricolporate pollen grains, two had tri- and tetracolporate pollen grains and a single species exhibited, only tetracolporate pollen. The amb ranged from triangular to square, and the shape varied from oblate-spheroidal to prolate-spheroidal. Three different types of exine ornamentation were observed: psilate, scabrate and perforate. In addition to morphological data, we found positive association between the chromosome numbers and size of pollen grains, and also between the length and width of the colpi. The results indicate that the characteristics of pollen grains in Lippia may be used as an additional taxonomic character of the genus.

scholarly journals Pollen morphology of the genus Eremanthus Less. (Vernonieae, Asteraceae)

2012 ◽  
Vol 26 (1) ◽  
pp. 46-57 ◽  
Author(s):  
BenoÎt Loeuille ◽  
Raquel Maria Batista Souza-Souza ◽  
Vanessa Holanda Righetti Abreu ◽  
Cláudia Barbieri Ferreira Mendonça ◽  
Vania Gonçalves-Esteves
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Additional Data ◽  
Phylogenetic Reconstruction ◽  
Pollen Grains ◽  
Prolate Spheroidal ◽  
Oblate Spheroidal ◽  
Quantitative Characters ◽  
Scanning Electron

In order to evaluate the significance of the pollen morphology for generic and infrageneric taxonomy of the genus Eremanthus (Vernonieae, Asteraceae), and to provide additional data for its phylogenetic reconstruction, the pollen of 20 of the 23 species of the genus was examined using light and scanning electron microscopy. Acetolysed pollen grains were measured, described, and illustrated using light microscopy, while non-acetolysed pollen grains were analyzed using scanning electron microscopy. Pollen grains of these species are isopolar, oblate-spheroidal in most of the species, more rarely prolate spheroidal or suboblate, subtriangular amb, tricolporate and subechinolophate. The variation among quantitative characters does not correlate with the macromorphological subdivision of the genus or with the generic or specific limits.

scholarly journals Pollen morphology of Verbascum L. (Scrophulariaceae) in Northern and Central Iraq

2014 ◽  
Vol 21 (2) ◽  
pp. 159-165 ◽  
Author(s):  
Muazaz Al-Hadeethy ◽  
Athiya Al-Mashhadani ◽  
Talib Al-Khesraji ◽  
Sahapat Barusrux ◽  
Hazim Al-Jewari ◽  
...  
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Pollen Size ◽  
Prolate Spheroidal ◽  
Oblate Spheroidal ◽  
Plant Taxon ◽  
Electron Microscopes

The present study highlights the taxonomic values of the pollen features of 20 species of Verbascum L. in Iraq. The pollen grains were acetolysed and observed under Light and Electron microscopes. Our results showed that the pollen grains of these species are usually radially symmetrical, isopolar, tricolporate and display reticulate sculpturing. The variations were found in shape, size, and exine thickness. Most of the species are subprolate, prolate spheroidal, and prolate, whereas oblate spheroidal pollens were found only in V. thapsus. The pollen size among the species studied ranges from 16.2-32.5 µm. The majority of species are medium sized except V. agrimoniifolium and V. oreophilum that are small sized, and four species i.e. V. palmyrense, V. sinuatum, V. songaricum, and V. thapsus having both small and medium sized pollen grains. Moreover, the result showed that the exine thickness ranges from 0.87-4.75 µm, but this value can overlap between some species. Therefore, only the shape of pollen grains could be used to classify these species into groups.DOI: http://dx.doi.org/10.3329/bjpt.v21i2.21355Bangladesh J. Plant Taxon. 21(2): 159-165, 2014 (December)

scholarly journals Pollen morphology of Malvaceae genera from Saudi Arabia and its taxonomic significance

2021 ◽  
pp. 725-742
Author(s):  
Kadry Abdel khalik ◽  
Suad Al- Ruzayza ◽  
Abdullah Assiri ◽  
Ahmed Elkordy
Keyword(s):  
Saudi Arabia ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Polar Axis ◽  
Morphological Characters ◽  
Average Height ◽  
Prolate Spheroidal ◽  
Oblate Spheroidal ◽  
Equatorial Diameter ◽  
Pollen Shape

Pollen morphology of 20 species belong to seven genera (Abutilon, Althaea, Hibiscus, Malva, Pavonia, Senra and Sida) of Malvaceae from Saudi Arabia were studied by using light microscope (LM) and scanning electron microscope (SEM). Quantitative and qualitative pollen morphological characters which vary among investigated taxa are found in the pollen polarity, symmetry, size, shape, polar axis, equatorial diameter, P/E ratio, average height and width of spine, aperature character and spine index. The pollen grains vary from spheroidal, prolate spheroidal, oblate spheroidal to suboblate. All taxa were characterized by relatively large to medium sized pollen grains, numerous pores scattered irregularly all over the grain, and echinate sculpturing. Sida ovata is the largest size pollen grain (138.95) µm. On the other hand, Malva parviflora showed the smallest pollen size (52.28 µm). The average height and width of spine varied greatly among studied taxa. The highest spines (20.65µm) found in Sida ovata, while the shortest (3.19 µm) was found in Abutilon pannosum. Results of the pollen shape, size, and exine sculpture characters offered useful data for evaluating the taxonomy of Malvaceae both on subgeneric and sectional levels. A key for the identification of the investigated taxa based on pollen grains characters is also provided

Pollen morphology of some Verbascum (Scrophulariaceae) taxa in Turkey

Phytotaxa ◽  
2018 ◽  
Vol 333 (2) ◽  
pp. 209 ◽  
Author(s):  
AYŞE ÖZTÜRK ◽  
KUDRET BETÜL GÜNEY ◽  
BARIŞ BANİ ◽  
KERİM GÜNEY ◽  
FAİK AHMET KARAVELİOĞULLARI ◽  
...  
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Polar Axis ◽  
Prolate Spheroidal ◽  
Oblate Spheroidal ◽  
General Terms ◽  
Surface Ornamentation ◽  
Pollen Shape ◽  
Axis Length ◽  
Scanning Electron

Pollen morphology of six Verbascum (Scrophulariaceae) taxa belonging to five different groups in the genus [V. georgicum (group E), V. nudatum var. nudatum (group F), V. cariense (group F), V. bithynicum (group H), V. pycnostachyum (group K), and V. lasianthum (group L)] was studied. Pollen slides were prepared according to the Woodhouse method and were examined with light-microscopy (LM) and Scanning Electron Microscopy (SEM). All studied pollen grains are generally monads, though tetrads (5 %) were observed in Verbascum nudatum var. nudatum. Pollen grains of all studied taxa were determined as isopolar and radially symmetric. In general terms, aperture types are trizonocolporate, but also trisyncolpate (V. lasianthum 10 %, V. pycnostachum 1 %, and V. georgicum 4 %) and trizonocolpate (V. cariense 10 %, V. bithynicum 10%, V. lasianthum 90%, V. pycnostachyum 9%, and V. georgicum 96 %) aperture types were observed. The shapes of the pollen grains were determined as prolate, subprolate, prolate-spheroidal and oblate-spheroidal. The sculpture was reticulate in all cases. The results of the study corroborate that morphological features, such as pollen shape, polar axis length (P), equatorial axis length (L), aperture type, surface ornamentation, muri thickness, and lumina shape, show differences which can be taken into consideration in the systematic discrimination within the groups, and also for discrimination of the groups in the genus.

scholarly journals Use of Pollen Morphology Traits for Identifying Species of Centaurea L. Asteraceae in Kurdistan-Iraq

2020 ◽  
Vol 8 (4) ◽  
pp. 131-138
Author(s):  
Rizgar Y. Ismail ◽  
Saleem E. Shahbaz
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Principal Component ◽  
Polar View ◽  
Pollen Grain ◽  
Medium Size ◽  
Prolate Spheroidal ◽  
Oblate Spheroidal ◽  
Total Variability ◽  
Pollen Shape

The polleniferous material of Centaurea taxa grow in Kurdistan-Iraq was collected. Samples were tested using scanning electron microscopy (SEM) and light microscopy (LM). In the polar view, pollen grain outlines are mostly triangular or triangular-circular. In equatorial view, the elliptic shape is common, while circulars or semicircular shapes are rare. The exine sculpture is scabrate, and the tectum is perforate. Number of sculpture microspinules/ µm², and their heights together with the number of wall perforations provide significant characters for taxa delimitation. Pollen grains of all species are of medium size, very few of some species pollen are larger or smaller in size. Species producing subprolate pollen shape is common, while oblate spheroidal and Prolate spheroidal shapes are less common. The principal component analysis and the discriminant analysis can recognize 65.478% and 87.54% of the total variability respectively; moreover, the discriminant function can correctly classify 125 or 78.125% out of 160 observations for pollen traits. 

scholarly journals PALYNOLOGICAL STUDY OF GENUS Pterocephalus IN IRAQ

2020 ◽  
Vol 51 (2) ◽  
pp. 565-573
Author(s):  
Al-Dobaissi & et al.
Keyword(s):  
Numerical Analysis ◽  
Light Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Significant Feature ◽  
Prolate Spheroidal ◽  
Oblate Spheroidal ◽  
Large Size ◽  
Palynological Study

This research was aimed to study the pollen morphology for the genus Pterocephalus(Vaill)  from Dipsacaceae family in Iraq, and to utilize these feathers in isolating the species as valuable taxonomic traits for enriching Iraqi flora. The study included characteristics of the type, shape, size, sculpturing and apertures, as well as determining the full dimensions using light microscopy as well as numerical analysis of this species and draw polygonal shapes and denderogram  convergence between species. The results of the study of pollen and polygonal forms showed significant differences in the characteristics at the level of each species, which helps to identification the genus species, as it was found that the pollen was a tricolpate, and shape was specified to be sub spheroidal,  sub prolate, oblate spheroidal. and prolate spheroidal, The pollen grains varied in size between large,  and very large size. However the most significant feature is that included four types of sculpture using to isolate the species to  : Reticulate and spinate in P. laxus ,P. strictus, and P. nestorianu, reticulate and spinulate in P. brevis, P. plumosus, Reticulate to striate and spinulate in P. canus, and Spinate in  P. kurdicus, and  P. pyrethrifolius. The dendritic scheme showed the convergence of some species among them and in varying convergence ratios.            

scholarly journals Pollen Morphology and Anatomy of Cornelian Cherry (Cornus mas L.) Cultivars

HortScience ◽  
2009 ◽  
Vol 44 (2) ◽  
pp. 519-522 ◽  
Author(s):  
Cevriye Mert
Keyword(s):  
Electron Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Pollen Grain ◽  
Prolate Spheroidal ◽  
Normal Appearance ◽  
Cornelian Cherry ◽  
Oblate Spheroidal ◽  
Cornus Mas ◽  
Transmission Electron

Morphology and ultrastructure of pollen grain were described for six cornelian cherry (Cornus mas L.) cultivars (Degirmendere, Erkenci Degirmendere, İri Bardak, Yuvarlak Bardak, Uzun Memeli, and Bugur) using light microscopy and both scanning and transmission electron microscopy. Pollen grains of cornelian cherry cultivars are trizonocolporate, the germinal furrow extending almost the full length of the grain axis. Pollen grain length for the studied cultivars ranged from 23.63 to 25.13 μm. Two different pollen shapes were observed: oblate spheroidal and prolate spheroidal. Significant changes in various layers of the pollen wall are as follows: the thickness of the intine: 233.1 to 406.4 nm, exine: 510.2 to 842.7 nm, and total wall 851.4 to 1175.8 nm. Percentages of abnormal pollen grains ranged from 3.9% to 27.6% among the cultivars. Abnormal pollen grains were categorized as: 1) shrunken pollen grains of abnormal appearance with little cytoplasm; 2) pollen grains of normal appearance with little or no cytoplasm; and 3) shrunken, abnormal pollen grains of elliptical shape with a colpate-type aperture.

scholarly journals Pollen morphology of the Polish species of the genus Ribes L.

2014 ◽  
Vol 67 (3-4) ◽  
pp. 275-285 ◽  
Author(s):  
Dorota Wrońska-Pilarek
Keyword(s):  
Native Species ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Morphological Characters ◽  
Prolate Spheroidal ◽  
Diagnostic Features ◽  
Grain Diameter

This paper presents results of studies on pollen morphology of 6 Polish species of the genus Ribes L. (family Grossulariaceae). Observations were carried out with LM and SEM. Pollen diagnoses were illustrated by series of microphotographs. Grains of examined species are small to medium-sized and prolate spheroidal or subprolate in shape, rarely prolate. They represent three pollen classes: zonocolporate, pantoaperturate and pantoporate. Three types of ectoapertures have been observed: colpi, pori and colpoids. Endoapertures are pori, in number (4-) 6-7-8 (-14) per grain. Ornamentation is psilate or fossulate, with the exception of the ectoaperture areas, which are granulate. According to the author, the polarity or apolarity, type of pollen class and ectoaperture, number of endopori and ratio of exine thickness to grain diameter are the main diagnostic features of the pollen grains of the native species of Ribes. The key to Polish species, basing on the morphological characters of grains is given too.

Contribution to the pollen morphology of Tragopogon (Asteraceae) in Turkey

Phytotaxa ◽  
2018 ◽  
Vol 361 (2) ◽  
pp. 168 ◽  
Author(s):  
MUTLU GÜLTEPE ◽  
SERDAR MAKBUL ◽  
SEDA OKUR ◽  
KAMİL COŞKUNÇELEBİ
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Principal Component ◽  
Numerical Analyses ◽  
Oblate Spheroidal ◽  
Pore Length ◽  
Principal Component Analyses ◽  
Scanning Electron

The pollen morphology of 25 Tragopogon L. taxa (including four subspecies and four varieties) distributed in Turkey was studied under light and scanning electron microscopy. It was observed that pollen grains of the examined Tragopogon taxa are suboblate and oblate-spheroidal in shape, and 3-zonocolpororate with fifteen lacunae. The lenghts of the polar axes and equatorial axes range from 31.57 to 40.35 µm and 35.32 to 44.65 µm, respectively. Numerical analyses show that the length of equatorial axis and the pore length are the most valuable characters among nineteen palynological traits for separating the examined taxa. The general palynological characteristics of the examined taxa allow some taxonomical evaluations for the genus. However, the results of cluster and principal component analyses did not support the division of the genus at any subgeneric level; neither did the ligule colour, as reported in the literature.

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