Pollen Morphology of the Genus Tragopogon (Asteraceae)

2021 ◽  
Vol 63 (1-2) ◽  
pp. 31-43
Author(s):  
H. Azizi ◽  
M. Sheidai ◽  
V. Mozaffarian ◽  
Z. Noormohammadi
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Polar View ◽  
Pollen Grain ◽  
The Other ◽  
Prolate Spheroidal ◽  
Old World ◽  
Oblate Spheroidal ◽  
Scanning Electron

Tragopogon L. (Cichorioideae, Lactuceae, Scorzonerinae) is an Old World genus with 150 species. Pollen morphology has proved useful in the systematics of some genera and species of Asteraceae as well as in that of some of its genera and species. The pollen morphology of 24 taxa of the genus Tragopogon was investigated in detail by scanning electron microscopy (SEM). The pollen grain type ranged from suboblate, oblate-spheroidal to prolate-spheroidal in equatorial view and hexagonal, obtuse-hexagonal to hexagonal-angular in polar view. In this study separation of the species of the sections Majores, Profundisulcati, Sosnovsky, Chromopappus, Rubriflori according to Flora Iranica is presented from the other species of Tragopogon. T. jezdianus, T. porphyrocephalus, T. rezaiyensis are suggested to belong to Rubriflori section. The results indicate that the palynological characters of the genus Tragopogon are valuable for taxonomic applications and are useful for classification.

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 Taxonomic significance of pollen morphology in Succisa and Succisella

2019 ◽  
Vol 55 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Zoya M. Tsymbalyuk ◽  
Sergei L. Mosyakin ◽  
Lyudmila M. Nitsenko
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Polar View ◽  
Taxonomic Significance ◽  
Oblate Spheroidal ◽  
Phylogenetic Studies ◽  
Molecular Phylogenetic ◽  
Scanning Electron

Abstract Pollen morphology of representatives of the genera Succisa and Succisella in the flora of Ukraine was studied using light and scanning electron microscopy. Pollen grains in both taxa were tricolpate, prolate, rarely oblate-spheroidal or spheroidal; large-sized. Their outline in polar view was subcircular, rarely trilobate, in equatorial view elliptical or rarely circular. Colpi short, of variable width, margins irregular with distinct, narrow margo, and blunt or acute ends. Exine sculpture was echinate-microechinate. The revealed characteristics of pollen grains are taxonomically significant at the generic and specific levels, and they can be used in pollen analysis. Palynomorphological data are consistent with the results of recent molecular phylogenetic studies. Data on pollen morphology also confirm taxonomic circumscription of Succiseae V. Mayer & Ehrend. Pollen grains in Succiseae are characterized by a tricolpate aperture type, which was probably ancestral in Dipsacaceae s. str.

scholarly journals Pollen morphology of the genus Impatiens L. (Balsaminaceae) and its systematic implications

2021 ◽  
Vol 64 (2) ◽  
pp. 207-219
Author(s):  
Muthulakshmipechiammal Pechimuthu ◽  
Rajendran Arumugam ◽  
Samydurai Ponnusamy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tamil Nadu ◽  
Pollen Morphology ◽  
Polar View ◽  
Structural Diversity ◽  
Species Differentiation ◽  
Prolate Spheroidal ◽  
Scanning Electron

Pollen morphology of 18 species from the genus Impatiens collected from different localities in Nilgiris, Tamil Nadu was evaluated using scanning electron microscopy (SEM) during the period of February 2017 to November 2019. From the observation of pollen it was found to be structurally monad; prolate, sub-prolate and prolate-spheroidal in equatorial view; and circular, rectangular, triangular, quinquangular, elliptic and quadrangular in polar view. The apertures varied from dicolpate, tricolpate to tetracolpate. The main ornamentation type was reticulate in most of the species except Impatiens fruticosa which showed echinate ornamentation. The variations in pollen structure within the species were useful for the identification and classification of the genus Impatiens. The high structural diversity renders important taxonomic value for species differentiation.

Scanning electron microscopy observations of pollen morphology in common vetch (Vicia sativa) subspecies

2021 ◽  
pp. 1-14
Author(s):  
Rui Dong ◽  
Zhongjie Lu ◽  
Zhengyu Yang ◽  
Yanrong Wang ◽  
Chao Chen
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Polar View ◽  
Polar Axis ◽  
Vicia Sativa ◽  
Common Vetch ◽  
Plant Phylogeny ◽  
Axis Length ◽  
Scanning Electron

Abstract Common vetch (Vicia sativa) is an important forage and green manure crop that is widely cultivated around the world. However, the large number of subspecies and accessions of common vetch has made taxonomic research on this species difficult. Pollen morphology data can provide important evidence in the study of plant phylogeny. Therefore, in this research, light microscopy and scanning electron microscopy were used to observe seven morphological traits of pollens from 22 common vetch accessions, and residual maximum likelihood and pattern analysis was conducted. The results showed that the pollen grains of the 22 accessions were all monad pollen and the polar view revealed three-lobed circular and triangular shapes, while the equatorial view mainly revealed an oblate shape; only one accession showed an oblate spherical shape. All accessions were 3-zonocolporate and the colpus length extended close to the poles. The polar axis length was (19.39 ± 0.97)–(42.12 ± 0.76) μm and the equatorial axis length was (35.97 ± 1.27)–(45.25 ± 0.81) μm. We found that qualitative traits of pollen shape, aperture polar view and ornamentation were highly stable. Among them, polar axis length, equatorial axis length and colpus length and width had significant differences among the accessions. The ratios of the equatorial and polar axes had significant differences among the subspecies. This trait information could be used for the classification and identification of common vetch accessions and subspecies.

Pollen morphology of Sabinaria magnifica (Cryosophileae, Coryphoideae, Arecaceae)

Phytotaxa ◽  
2015 ◽  
Vol 207 (1) ◽  
pp. 135 ◽  
Author(s):  
Giovanni Raul Bogota ◽  
Carina Hoorn ◽  
Wim Star ◽  
Rob Langelaan ◽  
Hannah Banks ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Light Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
The Other ◽  
Transmission Electron ◽  
Palm Species ◽  
Scanning Electron

Sabinaria magnifica is so far the only known species in the recently discovered tropical palm genus Sabinaria (Arecaceae). Here we present a complete description of the pollen morphology of this palm species based on light microscopy (LM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). We also made SEM-based comparisons of Sabinaria with other genera within the tribe Cryosophileae. Pollen grains of Sabinaria magnifica resemble the other genera in the heteropolar, slightly asymmetric monads, and the monosulcate and tectate exine with perforate surface. Nevertheless, there are some clear differences with Thrinax, Chelyocarpus and Cryosophila in terms of aperture and exine. S. magnifica differs from its closest relative, Itaya amicorum, in the exine structure. This study shows that a combination of microscope techniques is essential for the identification of different genera within the Cryosophileae and may also be a necessary when working with other palynologically less distinct palm genera. 

Pollen morphology of the Myrtaceae. Part 3: tribes Chamelaucieae, Leptospermeae and Lindsayomyrteae

2012 ◽  
Vol 60 (3) ◽  
pp. 225 ◽  
Author(s):  
Andrew H. Thornhill ◽  
Peter G. Wilson ◽  
Jeff Drudge ◽  
Matthew D. Barrett ◽  
Geoff S. Hope ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Pollen Morphology ◽  
Prolate Spheroidal ◽  
Scanning Electron

The pollen morphology of 36 genera and 147 species from the Myrtaceae tribes Chamelaucieae, Leptospermeae and Lindsayomyrteae was surveyed using scanning electron microscopy (SEM) and light microscopy (LM). Syncolpate pollen were observed in all genera of Leptospermeae and some genera of Chamelaucieae. Genera of tribe Chamelaucieae displayed five distinct colpal morphologies, which makes it the tribe with the most diverse pollen in Myrtaceae. Six genera of Chamelaucieae, including Actinodium, Chamelaucium, Darwinia, Homoranthus, Pileanthus and Verticordia, produce large acolpate pollen not observed in any other Myrtaceae. Two of these genera produce distinct pollen; Actinodium is the only genus to have prolate-spheroidal shaped pollen, and Pileanthus pollen is large and dicolporate. A number of anomalous aperture types occurred in species of Chamelaucieae, including monocolporate (Homoranthus thomasii), pentacolporate (Calytrix oldfieldii) and hexacolporate (Sannantha tozerensis). Pollen of Lindsayomyrteae appeared similar to those of Leptospermeae and Chamelaucieae, and on the basis of pollen features, could be related to these two tribes.

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.

scholarly journals Pollen Morphology of Some Species of the Genus Sansevieria Petagna (Asparagaceae)

2017 ◽  
Vol 59 (2) ◽  
pp. 63-75 ◽  
Author(s):  
Małgorzata Klimko ◽  
Renata Nowińska ◽  
Paul Wilkin ◽  
Justyna Wiland-Szymańska
Keyword(s):  
Electron Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Grain Morphology ◽  
Pollen Grain ◽  
Prolate Spheroidal ◽  
Pollen Grain Morphology ◽  
First Time ◽  
Scanning Electron ◽  
Eleven Species

AbstractPollen grains of 15 species of the genus Sansevieria were examined using light and scanning electron microscopy. The pollen grains were single, but dyads were also found. The basic shape of the pollen grains (with chemical treatment) was subprolate, prolate and prolate-spheroidal and the pollen grains were large (> 50 mm). The pollen grains observed in SEM were prolate-spheroidal, subprolate, prolate and perprolate. The aperture occupied nearly the entire distal hemisphere. The surface of non-apertural areas was microreticulate, psilate-perforate, fossulate and verrucate. The surface of the apertural area was psilate-perforate-verrucate, microreticulate-verrucategemmate and psilate-perforate. The tectum was homogeneous, with perforations. Our results suggest that some species cannot be separated based on pollen grain morphology, but only may be categorized into their groups. The present study investigated pollen grain morphology in eleven species for the first time in terms of pollen micromorphology and provided some important new data.

scholarly journals Pollen morphology of Prototulbaghia Vosa: A comparative palynological study of the Southern African Alliaceae.

2013 ◽  
Vol 32 (1) ◽  
Author(s):  
Melissa Andriessen ◽  
Madeleen Struwig ◽  
Stefan J. Siebert
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Pollen Grain ◽  
Evolutionary Significance ◽  
Monotypic Genus ◽  
Taxonomic Characteristic ◽  
Unknown Event ◽  
Palynological Study ◽  
Scanning Electron

The  Southern  African  Alliaceae  Borkh.  is  represented  by  four genera (Allium L., Nothoscordum Kunth, Tulbaghia L. and Prototulbaghia Vosa) and 28 species. The  pollen  morphology  of  the  endangered  monotypic  genus Prototulbaghia has  not  been described  before.  A  comparative  study  of  the  pollen  morphology  of Prototulbaghia  siebertii Vosa, Nothoscordum  borbonicum Kunth, Tulbaghia  simmleri P.Beauv.  and T.  violaceae Harv.  is presented in this article. Scanning electron microscopy, as well as light microscopy, were used to examine the pollen. The pollen morphology of the species can be described as perprolate and monosulcate, and the surface sculpture as reticulate and heterobrochate. However, the pollen of Prototulbaghia siebertii displays a unique characteristic as the grains are folded in their breadth with the tips touching, hence causing the grain to display a triangular and disulcate appearance. It might be possible to ascribe this fold to the process of harmomegathy or a still unknown event that occurs during the development of the pollen grain. This phenomenon should be further investigated to determine the cause of folding and whether it is a unique taxonomic  characteristic  of  this  genus,  and  if  it  could  be  of  evolutionary  significance  for the Alliaceae.

scholarly journals Pollen morphology of Amygdalus L. (Rosaceae) in Iran

2011 ◽  
Vol 79 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Mahnaz Vafadar ◽  
Farideh Attar ◽  
Hosein Maroofi ◽  
Mansur Mirtadzadini
Keyword(s):  
Electron Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Polar View ◽  
Pollen Grain ◽  
Type I ◽  
Type Ii ◽  
Type V ◽  
Scanning Electron ◽  
Section Level

Pollen grain of 16 species and three hybrids of the genus <em>Amygdalus</em> L., representing two subgenera and two sections distributed in Iran were examined by light and scanning electron microscopy. All pollen grains are tricolporate. The shape of grains varies from subprolate through prolate. Regarding outline, in polar view, pollen grains are triangular-circular and in equatorial view, elliptic. Regarding sculpturing of exine, the frequent type like many members of family <em>Rosaceae</em> is striate with or without perforations that can be subdivided into three subtypes: type I (A-B), type II (A-B) and type V. In three species, <em>A. trichamygdalus</em>, <em>A. spinosissima</em> and <em>A. orientalis</em>, exine sculpture type is completely different. In the first species is rugulate, in the second species is reticulate and in <em>A. orientalis</em>, it is gemmate-perforate. Ornamentation of ridges (muri) in the striate sculpture is parallel to ectocolpus. Number of perforations in tectum, diameter of them, striae intervals and the thickness of ridges varies among studied taxa. The striae have different depth and slope. Results showed that among pollen grain characters, shape is useful character solely for separating of taxonomic ranks in Iranian Amygdalus specially in subgeneric or section level.

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