scholarly journals Pollen morphology of selected taxa of Ehretiaceae from Western Ghats, India.

2018 ◽  
Vol 7 (11) ◽  
pp. 2446
Author(s):  
Amalaurpava Mary Michael ◽  
Vijay Gopal Gumma
Keyword(s):  
Pollen Morphology ◽  
Pollen Grains ◽  
Western Ghat ◽  
Electron Microscopic ◽  
History Of Vegetation ◽  
Microscopic Studies ◽  
Reserve Forest ◽  
History Of ◽  
Phylogenetic Origin ◽  
Scanning Electron

Pollen Morphology is an important tool in the identification of a genera. Data on pollen morphology is used as a reference in other fields of palynology like allergic studies, melissopalynology, tracing the history of vegetation, genetic and evolutionary studies, climate change studies etc. Pollen morphology of two genera of Ehretiaceae family is studied using Scanning electron microscope. Palynological contributions are still fragmentary in the family Ehretiaceae of southern India. Ehretia pubescens Benth is a small tree belonging to Ehretiaceae family located at the foothill of Chamundi hill reserve forest which is a part of Western ghat near Mysuru and Cormona retusa (Vahl) Masam is a shrub found 3400ft above on top of Chamundi Hill. Pollen grains were acetolyzed and Scanning Electron Microscopic studies conducted to obtain data on pollen morphology. The study is conducted to assess the taxonomic significance of pollen morphology in relation to their phylogenetic origin of the two genera of Ehretiaceae in the region. The palynological evidence shows Ehretia pubescens with tri-zonocolporate and heterocolpate pollen grains and Cormona retusa with tricolpate pollen grain without the pseudocolpi. Both genera have foveolate tectum. Palynological data indicate that these two naturalized taxa ie. Ehretia pubescens and Cormona retusa belong to two different lineage of Ehretia and can be identified by their pollen morphology. Diversity in the pollen characters points towards the eurypalynous nature in Ehretiaceae.

scholarly journals ELECTRON MICROSCOPIC STUDIES OF SOME ANTICANCER PLANTS POLLEN GRAINS

2021 ◽  
Vol 9 (10) ◽  
pp. 1386-1393
Author(s):  
Jayshree Sandesh Thaware ◽  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pollen Morphology ◽  
Pollen Grains ◽  
Morphological Characters ◽  
Electron Microscopic ◽  
Plant Parts ◽  
Morphological Studies ◽  
Datura Metel ◽  
Scanning Electron

Pollen is appropriately referred by some as Golden dust extremely valuable on account of their tremendous applications in science, industries and public health. No other plant part even though extremely tiny in size is packed with so much information and power. Similar to other plant parts, pollen characters are so varied that the classification system of plants can be built up entirely on the basis of pollen morphology.Palynology is the distinct branch of biology that deals with the dispersed microscopic tiny living and fossil entities including pollen grains, spores, algal and fungal fragments and others. An important aspect of Palynology is the Pollen morphology. The importance of Palynology in taxonomic and phylogenetic consideration of plants is well known. The changes occurring through hybridization and years of cultivation are reflected in pollen morphology. The scope and interest in the study of pollen morphology have widened with the advent of Scanning Electron Microscopy (SEM) and with regards to unipalynous taxa particularly the understanding of finer morphology is of fundamental importance. SEM gives a correct understanding of exine surface as the electron photographs of the surface replica of the exine provides the exact picture of the ornamentation pattern. The variation in the pollen morphological characters helps in the classification of plant taxa and their assessment of their phylogenetic relationship. In the present investigation, the pollen morphological studies were carried out of some ethnomedicinal plants like Catharanthus roseus, Allamanda cathartica, Datura metel, Brassica juncea, Raphanus sativus and Cleome viscosa pollen grains by Scanning electron microscopy. All that they possess anticancer characteristics in common.

scholarly journals Scanning Electron Microscopic Studies on Surface Pattern of the Pollen Loads from Apis cerana in Jajarkot District

2012 ◽  
Vol 12 ◽  
pp. 340-349 ◽  
Author(s):  
Khum N Paudayal ◽  
Ishan Gautam
Keyword(s):  
Apis Cerana ◽  
Pollen Grains ◽  
Surface Pattern ◽  
Correct Identification ◽  
Pollen Load ◽  
Electron Microscopic ◽  
Microscopic Studies ◽  
Myrica Esculenta ◽  
Plant Sources ◽  
Scanning Electron

Over nineteen species of pollen flora belonging to thirteen families were recovered from four pollen load samples from honey bee Apis cerana collected in Jajarkot district, mid-western region, Nepal. The pollen morphology was investigated using light microscopy along with scanning electron microscopy for correct identification of pollen to its lower taxonomic level and to contribute to melissopalynological studies originating from the native apiflora. The palynological assemblage identified to the generic and some up to species level belong to Alnus sp., Artemisia sp., Brassica sp., Cornus sp., Diploknema sp., Fraxinus sp., Ilex sp., Jasminum sp., Justicia sp., Ligustrum sp., Myrica esculenta, Salix sp., Strobilanthes sp., and Urtica sp. Some of the pollen grains identified to only family level, belong to, Acanthanceae, Compositae, Lamiaceae and Rosaceae. The identified pollens clearly reflect the botanical and geographical origins of the pollen load samples. Palynomorphological investigation included the description of pollen symmetry, polarity, ornamentation, aperture, shape and size. The results for the pollen assemblages and nectariferous plant sources of Jajarkot district are discussed.DOI: http://dx.doi.org/10.3126/njst.v12i0.6522 Nepal Journal of Science and Technology 12 (2011) 340-349

scholarly journals Scanning Electron Microscopic Studies on the Red Pulp of the Mink Spleen

1989 ◽  
Vol 51 (4) ◽  
pp. 775-791 ◽  
Author(s):  
Mitsuo ABE ◽  
Kazushige TAKEHANA ◽  
Kenji IWASA ◽  
Takeo HIRAGA
Keyword(s):  
Electron Microscopic ◽  
Scanning Electron Microscopic ◽  
Microscopic Studies ◽  
Scanning Electron ◽  
Red Pulp

A Scanning Electron Microscopic Study of the Normal Human Stapes

1979 ◽  
Vol 88 (6_suppl4) ◽  
pp. 2-14 ◽  
Author(s):  
Malcolm D. Graham ◽  
Rodney Perkins
Keyword(s):  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Electron Microscopic ◽  
Scanning Electron Microscopic Study ◽  
Scanning Electron Microscopic ◽  
Microscopic Features ◽  
Microscopic Studies ◽  
Normal Human ◽  
Temporal Bones ◽  
Scanning Electron

The structure of the normal human stapes was studied with the scanning electron microscope. Specimens were obtained 48 hours after death from adult human temporal bones free from obvious inflammatory disease. The specimens were fixed, dissected, critical-point dried and coated with gold. In this scanning electron microscopic study an attempt has been made to systematically demonstrate the average scanning electron microscopic features of various areas of the normal human stapes. An emphasis has been placed upon demonstrating as clearly as possible the details previously unclear or unrecognized and duplication of many excellent earlier light and electron microscopic studies has not been attempted. The typical appearance of the stapes head, neck, arch, crura and footplate has been presented. It is apparent that there exists a high degree of structural specialization particularly in the stapes arch and footplate area.

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)

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