Pollen morphology of Campanula (Campanulaceae) and allied genera in Iran with special focus on its systematic implication

Pollen morphology of 27 species of Photinia sensu stricto and five closely related genera of subfamily Maloideae (Rosaceae) were studied in detail. Palynomorphological characteristics were examined using scanning electron microscopy (SEM). Comparative pollen analysis was accomplished based on pollen size, shape, polar and equatorial views, polar and equatorial diameter ratio (P/E ratio), width of aperture, and exine ornamentation. The pollen grains of studied species were found to be monad, tricolporate, small to medium in size (P=17.42–30.45 μm, E=9.26–20.18 μm) and to have shapes oblate-spheroidal (0.88–1.0 μm), prolate-spheroidal (1.01–1.14 μm), sub-prolate (1.15–1.33 μm), prolate (1.34–2 μm), and perprolate (>2 μm). The exine ornamentation was perforated-striate, and two different types were identified. The result of quantitative characters has paltry taxonomic importance. The characters studied here delimit at generic level for some genera but not at species level. The obtained result was partially consistent with that of molecular studies published earlier. The pollen size and shape were found to be different between Asian and American species of Photinia. Especially exine sculpture was found to be an important feature to distinguish species of all genera studied. PCA analysis showed that the pollen shape, pollen sculpture, pollen size, and polarity are the key characters to distinguish the species of Photinia and the closely related genera in subfamily Maloideae. Based on pollen exine, two groups (Type I and Type II) were distinguished. The aim of the present study was to find out the taxonomic significance of palynomorphological characteristics in subfamily Maloideae (Rosaceae).

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Pollen morphology of Stachys (Lamiaceae) in Iran and its systematic implication

Flora ◽

10.1016/j.flora.2007.10.005 ◽

2008 ◽

Vol 203 (8) ◽

pp. 627-639 ◽

Cited By ~ 28

Author(s):

Yasaman Salmaki ◽

Ziba Jamzad ◽

Shahin Zarre ◽

Christian Bräuchler

Keyword(s):

Pollen Morphology ◽

Systematic Implication

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Pollen morphology and its systematic implication on some species of Artemisia L. from Gilgit-Baltistan Pakistan

Bangladesh Journal of Plant Taxonomy ◽

10.3329/bjpt.v26i2.44576 ◽

2019 ◽

Vol 26 (2) ◽

pp. 157-168 ◽

Cited By ~ 1

Author(s):

Adil Hussain ◽

Daniel Potter ◽

Muhammad Qasim Hayat ◽

Sumaira Sahreen ◽

Syed Ali Imran Bokhari

Keyword(s):

Pollen Morphology ◽

Pollen Grains ◽

Polar View ◽

The Family ◽

Artemisia Species ◽

Taxonomic Marker ◽

Micromorphological Characters ◽

Gilgit Baltistan ◽

Systematic Implication ◽

Scanning Electron

This study was accomplished to scrutinize the pollen morphology of 15 species of the genus Artemisia of the family Asteraceae from Gilgit-Baltistan region of Pakistan by means of scanning electron microscopy (SEM). Results revealed pollen grains of Artemisia species with tricolporate shape, and characterized by globular symmetry (ellipsoid ball shaped from equatorial side and three lobed rounds from polar view) with few exceptions. Additionally, the pollens are marked with reduced spinules on their surfaces which are diagnostic character for the genus Artemisia. In this study, seven micromorphological characters of pollen grains of 15 Artemisia species viz. shape of pollen, arrangement of spinules, exine sculpture, spinules base, equatorial width and polar length, were employed to construct a dendrogram following the consequential cluster analyses. In the dentrogram, four groups within the studied Artemisia species have been recognized. The pollen morphology of Artemisia could be a good taxonomic marker to cope with its taxonomic delimitations in combination with other floral and molecular attributes.

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Pollen morphology of Quercus (subgenus Quercus, section Quercus) in Iran and its systematic implication

Acta Societatis Botanicorum Poloniae ◽

10.5586/asbp.2012.005 ◽

2012 ◽

Vol 81 (1) ◽

pp. 33-41 ◽

Cited By ~ 7

Author(s):

Parisa Panahi ◽

Mohammad R. Pourmajidian ◽

Asghar Fallah ◽

Mehdi Pourhashemi

Keyword(s):

Pollen Morphology ◽

Morphological Characteristics ◽

Pollen Grains ◽

Structural Pattern ◽

Pollen Characters ◽

The Family ◽

Pollen Shape ◽

First Time ◽

The Relationship ◽

Systematic Implication

For the first time, pollen morphology of 9 (4 spp. and 5 subspp.) taxa representing lobed leaved oaks of Iran in the family of Fagaceae has been examined and illustrated using light microscopy and scanning electron microscopy of acetolysed material. Detailed pollen morphological characteristics are given for <em>Quercus</em> section. The pollen grains are single, isopolar, radially symmetrical, tricolpate, tricolporoidate or tricolporate. Pollens were studied to show all possible characteristics like shape, size, apertures, wall thickness, etc., with special reference to the specific features of each pollen type such as structural, sculptural and suprasculptural patterns. There is considerable variation in pollen morphology between taxa so that, three types of pollen shape, five types of structural pattern, two types of sculptural pattern, five types of suprasculptural pattern and three types of perfora distribution are defined. Furthermore, the relationship between pollen morphology and taxonomy is discussed. Overall, pollen characters are shown to be a useful and informative tool for assessing taxonomic position within <em>Quercus</em> section in Iran.

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Pollen morphology and numerical analysis of Tamarix L. (Tamaricaceae) in Egypt and its systematic implication

Bangladesh Journal of Plant Taxonomy ◽

10.3329/bjpt.v24i1.33036 ◽

2017 ◽

Vol 24 (1) ◽

pp. 91-105

Author(s):

Ahmed Elkordy ◽

Ahmed Faried

Keyword(s):

Numerical Analysis ◽

Pollen Morphology ◽

Life Form ◽

Pollen Grains ◽

Morphological Characters ◽

Wide Range ◽

Plant Taxon ◽

Pollen Shape ◽

Floral Characters ◽

Systematic Implication

A palynological and multivariate study of six species of Tamarix L. distributed in Egypt was carried out. Pollen morphology was examined by Light Microscope (LM) and Scanning Electron Microscope (SEM). The systematic study of these species was conducted by means of numerical analysis using UPGMA clustering and PCO analysis based on 33 morphological characters, including life form, vegetative parts, fruits, floral characters, seeds and pollen grains. Pollen grains were found to be monads, radially symmetrical, isopolar, small-sized and homocolpate. Tamarix nilotica can be easily separated from other taxa by its subprolate pollen shape. Two major clades were identified by multivariate analysis of morphological characters; one of them included three species, namely T. amplexicaulis, T. passerinoides and T. macrocarpa. Our results indicate that there is a wide range of morphological similarity among the species of section Polyadenia. The other clade included T. aphylla, T. tetragyna and T. nilotica from section Tamarix and section Oligadenia.Keywords: Tamarix; Pollen Morphology; Numerical Taxonomy; UPGMA Cluster; PCO, Egypt.Bangladesh J. Plant Taxon. 24(1): 91105, 2017 (June)

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Current concepts of the interventional treatment of proximal supraaortic vessel stenosis

VASA ◽

10.1024/0301-1526/a000216 ◽

2012 ◽

Vol 41 (5) ◽

pp. 313-318 ◽

Cited By ~ 5

Author(s):

Ernemann ◽

Bender ◽

Melms ◽

Brechtel ◽

Kobba ◽

...

Keyword(s):

Treatment Strategies ◽

Carotid Bifurcation ◽

Current Treatment ◽

Long Term Results ◽

Clinical Indication ◽

Interventional Treatment ◽

Special Focus ◽

Brachiocephalic Artery ◽

Treatment Concepts ◽

Angioplasty And Stenting

Interventional therapies using angioplasty and stenting of symptomatic stenosis of the proximal supraaortic vessels have evolved as safe and effective treatment strategies. The aim of this paper is to summarize the current treatment concepts for stenosis in the subclavian and brachiocephalic artery with regard to clinical indication, interventional technique including selection of the appropriate vascular approach and type of stent, angiographic and clinical short-term and long-term results and follow-up. The role of hybrid interventions for tandem stenoses of the carotid bifurcation and brachiocephalic artery is analysed. A systematic review of data for angioplasty and stenting of symptomatic extracranial vertebral artery stenosis is discussed with a special focus on restenosis rate.

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Social Psychology and Noninvasive Electrical Stimulation

European Psychologist ◽

10.1027/1016-9040/a000247 ◽

2016 ◽

Vol 21 (1) ◽

pp. 30-40 ◽

Cited By ~ 6

Author(s):

Paulo S. Boggio ◽

Gabriel G. Rêgo ◽

Lucas M. Marques ◽

Thiago L. Costa

Keyword(s):

Social Psychology ◽

Social Neuroscience ◽

Special Focus ◽

Social Pain ◽

Substantial Evidence ◽

Social Decision ◽

Correlational Research ◽

Neuroscience Research ◽

Social Decision Making ◽

Brain Behavior

Abstract. Social neuroscience and psychology have made substantial advances in the last few decades. Nonetheless, the field has relied mostly on behavioral, imaging, and other correlational research methods. Here we argue that transcranial direct current stimulation (tDCS) is an effective and relevant technique to be used in this field of research, allowing for the establishment of more causal brain-behavior relationships than can be achieved with most of the techniques used in this field. We review relevant brain stimulation-aided research in the fields of social pain, social interaction, prejudice, and social decision-making, with a special focus on tDCS. Despite the fact that the use of tDCS in Social Neuroscience and Psychology studies is still in its early days, results are promising. As better understanding of the processes behind social cognition becomes increasingly necessary due to political, clinical, and even philosophical demands, the fact that tDCS is arguably rare in Social Neuroscience research is very noteworthy. This review aims at inspiring researchers to employ tDCS in the investigation of issues within Social Neuroscience. We present substantial evidence that tDCS is indeed an appropriate tool for this purpose.

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