scholarly journals Pollen morphology of Rhododendron L. and related genera and its taxonomic significance

2013 ◽  
Vol 20 (2) ◽  
pp. 185-199 ◽  
Author(s):  
A.K.M. Golam Sarwar ◽  
Hideki Takahashi
Keyword(s):  
Electron Microscopy ◽  
Pollen Morphology ◽  
Morphological Characteristics ◽  
Pollen Grains ◽  
Taxonomic Significance ◽  
Sister Relationship ◽  
Infrageneric Classification ◽  
Plant Taxon ◽  
Additional Support

Pollen grains of 40 taxa of Rhododendron L. and its closely related genera, Therorhodion L. and Menziesia Sm., were examined by means of light microscopy and scanning electron microscopy (SEM), or SEM alone. Pollen tetrads of R. japonicum, R. schlippenbachii, R. tsusiophyllum and M. pentandra were examined also withtransmission electron microscopy. In all the genera studied, 3-colporate, oblate tosuboblate pollen grains are arranged in tetrahedral tetrads. The apocolpial pollen wall is composed of the exine - well developed tectum, columellae, foot layer and endexine, and the intine. On the contrary, the septal exine is composed of fragmentary tectum, and the two foot layers of adjacent grains are sometimes connected by columellae and endexine. Among different infrageneric taxa only the subsect. Ledum (sect. & subgen. Rhododendron) was characterized by small sized pollen tetrads, higher 2f/D value and rugulate exine sculpture. The pollen morphological characteristics overlapped each other in all other taxa. Thus palynological features showed little usefulness in the infrageneric classification of Rhododendron, however, they gave additional support to the individualgeneric status of Menziesia and Tsusiophyllum, and the sister relationship between Rhododendron and Therorhodion.DOI: http://dx.doi.org/10.3329/bjpt.v20i2.17393Bangladesh J. Plant Taxon. 20(2): 185-199, 2013

scholarly journals Pollen morphology of Iranian Dracocephalum L. (Lamiaceae) and its taxonomic significance

2015 ◽  
Vol 22 (2) ◽  
pp. 99-110 ◽  
Author(s):  
Maryam Naderifar ◽  
Ali Sonboli ◽  
Abbas Gholipour
Keyword(s):  
Electron Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Polar View ◽  
Taxonomic Significance ◽  
Infrageneric Classification ◽  
Exine Ornamentation ◽  
Plant Taxon ◽  
Scanning Electron

Pollen morphology of 11 Iranian Dracocephalum L. species was investigated using light and scanning electron microscopy to evaluate their taxonomic significance for the infrageneric classification of the genus. Pollen grains of all examined taxa were isopolar, hexacolpate, circular in polar view and spheroidal to prolate in equatorial view (P/E = 1.0?2.0). The smallest pollen grains were observed in D. aucheri (P = 29.7 ?m, E = 22.6 ?m), while the largest pollen was found in D. lindbergii (P = 45.1 ?m, E = 33.7 ?m). The highest and lowest apocolpium index (AI) were measured in D. aucheri (AI = 0.27) and D. surmandinum (AI = 0.08), respectively. Colpus membrane was egranulate in all examined species except for D. multicaule and D. ghahremanii. The main exine ornamentation type was characterized as bireticulate including five different subtypes. The results revealed that the exine ornamentation is a diagnostic character useful for the classification of Dracocephalum.Bangladesh J. Plant Taxon. 22(2): 99-110, 2015 (December)

scholarly journals Pollen morphology of Kalmia L. (Phyllodoceae, Ericaceae) and its taxonomic significance

2012 ◽  
Vol 19 (2) ◽  
pp. 123-133 ◽  
Author(s):  
A.K.M. Golam Sarwar ◽  
Hideki Takahashi
Keyword(s):  
Pollen Morphology ◽  
Evolutionary Trend ◽  
Taxonomic Significance ◽  
Infrageneric Classification ◽  
Quantitative Characters ◽  
Exine Sculpture ◽  
Dichotomous Key ◽  
Plant Taxon ◽  
Scanning Electron

Pollen morphology of seven taxa of Kalmia was examined using light and scanning electron microscopy (LM and SEM, respectively), or SEM alone, in search of new characters that might contribute to infrageneric classification of the genus. The Kalmia species are stenopalynous and characterized by 3-colpor(oid)ate, medium, oblate pollen united in tetrahedral tetrads with rugulate exine sculpture. However, a continuous and serial variation in all the quantitative characters and exine sculpture was revealed within the genus. Kalmia buxifolia is characterized by having the smallest pollen tetrads, largest aperture, largest 2f/D ratio and septum thicker than apocolpial exine. On the other hand, K. latifolia produces the largest pollen tetrads with smallest aperture and smallest 2f/D ratio. An evolutionary trend from rugulate to psilate has also been observed in apocolpial exine sculpture of the genus Kalmia. On the basis of acetolysed pollen characteristics, a dichotomous key for Kalmia was prepared. DOI: http://dx.doi.org/10.3329/bjpt.v19i2.13126 Bangladesh J. Plant Taxon. 19(2): 123-133, 2012 (December)

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 Morphological Investigations of Salvia L. In Southeastern of Turkey and Its Taxonomic Implication

2021 ◽  
Vol 28 (2) ◽  
pp. 395-403
Author(s):  
Fatma Mungan Kiliç
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Surface Sculpture ◽  
Plant Taxon ◽  
Pollen Shape ◽  
Micromorphological Characters ◽  
Scanning Electron

In this study, the pollen morphology and exine structure of nine species of the genus Salvia L. (Lamiaceae) were investigated using light microscopy and scanning electron microscopy (SEM). Six micromorphological characters (pollen shape, polar length, equatorial width, exine and intine thickness, colpus length and colpus width) of pollen grains of Salvia have been identified. The palynological observations revealed that pollen grains of most studied taxa of Salvia were suboblate shape and possess hekzacolpate aperture. Tectal surface sculpture was a good criterion to identify particular taxa from Salvia. The pollen of which is characterized by reticulate, the pollen ornamentation was similar in all studied taxa. Bangladesh J. Plant Taxon. 28(2): 395-403, 2021 (December)

scholarly journals Palynomorphological study of Dianthus petraeus waldst. et kit. (Caryophyllaceae)

2015 ◽  
Vol 67 (3) ◽  
pp. 973-980 ◽  
Author(s):  
Marina Macukanovic-Jocic ◽  
Snezana Jaric ◽  
Mica Mladenovic
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Taxonomic Status ◽  
The Balkans ◽  
The Mean ◽  
Pollen Diameter ◽  
Scanning Electron

The pollen morphology of Dianthus petraeus (Caryophyllaceae), which is endemic to the Balkans, has been examined by both light and scanning electron microscopy in order to provide taxonomically valuable characters that might be used in the classification of the Caryophyllaceae, as well as to contribute to the pollen atlas of Serbian apiflora. The pollen grains of D. petraeus are radially symmetrical, apolar, spheroidal and medium-sized. The mean of the pollen diameter is 45.5?1.4 ?m. The sculpturing pattern of exine is microechinate-microperforate, and the tectum is covered with minute echini averaging 0.8?0.1 ?m in length, more or less evenly distributed between the perforations. The microechini average number per sample area of 5 ?m x 5 ?m is 3.2?0.6. In view of the number, position and type of the apertures, the grains are polypantoporate, with about 13 operculate pores, averaging 6.4?0.7 ?m in diameter. Each operculum is covered with 4-6 conical spinules, which are longer than those on the exine surface. The mean interporal distance is 13.3?1.3 ?m. The obtained palynological results provide information that contribute towards a better understanding of the taxonomic status of D. petraeus.

Contribution to the knowledge of the pollen morphology of the genus Salvia (Lamiaceae)

Phytotaxa ◽  
2020 ◽  
Vol 428 (3) ◽  
pp. 228-240
Author(s):  
HÜLYA ÖZLER ◽  
AHMET KAHRAMAN ◽  
SEVİL PEHLİVAN ◽  
MUSA DOĞAN ◽  
BİROL BAŞER ◽  
...  
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Polar View ◽  
Pollen Data ◽  
Infrageneric Classification ◽  
Oblate Spheroidal ◽  
Pollen Characters ◽  
Exine Sculpturing ◽  
First Time

The pollen grains of 19 Turkish Salvia species in Aethiopis, Drymosphace, Hemisphace, Hymenosphace and Salvia sections, 13 of which are endemic to Turkey, were investigated, documented and illustrated through Light Microscopy (LM) and Scanning Electron Microscopy (SEM). This study provides pollen data of 14 species for the first time. The pollen grains of the species examined are monads, isopolar, radially symmetrical and hexacolpate, mostly medium in size, slightly elliptic to more or less circular in polar view and mainly oblate-spheroidal in equatorial view. Two different ornamentation types are recognized on exine sculpturing; reticulate-perforate and bireticulate. The present results do not generally support the traditional infrageneric classification of Salvia, but provide useful pollen characters for species delimitation.

scholarly journals Morphology of pollen in Ferula genus (Apiaceae)

PhytoKeys ◽  
2021 ◽  
Vol 179 ◽  
pp. 111-128
Author(s):  
Birol Başer ◽  
Mehmet Sagıroglu ◽  
Gulden Dogan ◽  
Hayri Duman
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Morphological Characteristics ◽  
Pollen Grains ◽  
Polar Axis ◽  
Average Linkage ◽  
Pollen Shape ◽  
First Time ◽  
Scanning Electron

In this study, the pollen morphology of all Ferula species distributed throughout the country of Turkey was studied with light and scanning electron microscopy for the first time. The aim is to identify the pollen morphological characteristics of 23 Ferula species. The pollen is radially symmetrical, isopolar and tricolporate in all examined species. Pollen grains are prolate and perprolate with the polar axis ranging from 22.28 to 40.47 µm and the equatorial axis from 13.70 to 18.73 µm. Their polar shapes are triangular, triangular to subtriangular and circular to subcircular. Several types of exine ornamentations have been observed on pollen through the use of scanning electron microscopy. The dendrogram constructed by using Average Linkage of the examined data revealed two main groups. It was determined that some pollen characteristics are more useful for classification than others. In particular, P, E, the ratio of P/E (pollen shape) and ornamentation in the polar and equatorial views are the most valuable variables for discrimination the Ferula species.

scholarly journals Taxonomical Investigation on Some Species of Genus Allium Based on the Pollen Morphology

2019 ◽  
pp. 1-10
Author(s):  
Mehdi Heidarian ◽  
Seyed Mohammad Mehdi Hamdi ◽  
Mohammad Mehdi Dehshiri ◽  
Taher Nejadsattari ◽  
Seyed Mohammad Masoumi
Keyword(s):  
Electron Microscopy ◽  
Pollen Morphology ◽  
Numerical Taxonomy ◽  
Morphological Characteristics ◽  
Pollen Grains ◽  
Pollen Grain ◽  
Wall Structure ◽  
Transmission Electron ◽  
Pollen Characters ◽  
Exine Ornamentation

Aims: The aim of this research was to investigate the morphological characteristics of the pollen grain of some species of genus Allium. Methodology: The pollen grains were examined by using Light Microscopy (LM), Scanning Electron Microscopy (SEM) and the pollen grains of one species under Transmission Electron Microscopy (TEM). Results: The pollen grains were oblate and medium in shape and size. The pollen ornamentation of exine surface, exine ornamentation on sulcus edge, lumina number in the exine surface and the state of pollen grain apex in the examined species were different. Semitectate and columellate ectexine with discontinuous endexine were seen in the pollen wall structure (sporoderm). The dendrogram obtained from the pollen characters in SEM observations by using the numerical taxonomy system (NTSYS) software placed the studied species in two types. Conclusion: Our palynological dendrogram can be used for segregation the sections and subgenera taxonomical levels in the studied species of genus Allium and confirmed the phylogram of the recent phylogenetic research.

scholarly journals Pollen morphology of the tribe Phyllodoceae (Ericoideae, Ericaceae) and its taxonomic significance

2014 ◽  
Vol 21 (2) ◽  
pp. 129-137 ◽  
Author(s):  
A.K.M. Golam Sarwar ◽  
Hideki Takahashi
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Morphological Data ◽  
Taxonomic Significance ◽  
Viscin Threads ◽  
Sem Study ◽  
Plant Taxon ◽  
Generic Relationships ◽  
Systematic Importance ◽  
Scanning Electron

Pollen morphology of 13 taxa belonging to 5 genera of the tribe Phyllodoceae (Ericaceae) was examined by means of light and scanning electron microscopy (LM and SEM, respectively), or SEM alone. In Phyllodoceae, 3-colpor(oid)ate, minute to medium, oblate pollen grains are united usually in tetrahedral tetrads. Pollen tetrads are generally characterized by the presence of viscin threads except Elliottia pyroliflora, Epigaea asiatica and Phyllodoce caerulea. The absence of viscin threads might indicate to a secondary loss, since these are present at least in some species within all the genera of Phyllodoceae. The pollen morphological data confirm the infra- and inter-generic relationships as identified by molecular phylogeny of Phyllodoceae and/or vice-versa. Although various palynological characters were found to be taxonomically important at different taxonomic levels, the apocolpial exine sculpture is emerged as one of the most important palynological features of systematic importance. The rugulate apocolpial exine with striate secondary sculpture and a reduced colpus might be apomorphic palynological character states for this tribe and Ericaceae as well. Hitherto, it is the first SEM study of Rhodothamnus pollen.DOI: http://dx.doi.org/10.3329/bjpt.v21i2.21351Bangladesh J. Plant Taxon. 21(2): 129-137, 2014 (December)

scholarly journals Pollen morphology of Teucrium L. (Lamiaceae, Ajugoideae) in Libya

2017 ◽  
Vol 24 (2) ◽  
pp. 219-226 ◽  
Author(s):  
Ream I. Marzouk ◽  
Salama M. El-Darier ◽  
Abdel Baset M. Askar
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Pollen Dimorphism ◽  
Exine Sculpture ◽  
Plant Taxon ◽  
Scanning Electron

Pollen grains of 11 taxa of Teucrium from Libya were examined using lightmicroscopy (LM) and scanning electron microscopy (SEM) in order to provide better insight on the evaluation of palynological attributes for species characterization of Teucrium with special emphasis on the five Libyan endemic. Two main pollen shapes were documented; subprolate and prolate or perprolate in T. fruticans. The exine sculpture inspected at surface, operculum and pole were mostly verrucate, perforate or scabrate. Teucrium fruticans attained the phenomenon of pollen dimorphism with two distinct shapes and specifics sculpture for each form. The results validated thetaxonomic significance of pollen grains for the discrimination among Teucrium species in Libya.Bangladesh J. Plant Taxon. 24(2): 219–226.

Sign in / Sign up

Export Citation Format

Share Document