scholarly journals Taxonomic significance of stomatal complex in fifteen species of Dendrobium Swartz (Orchidaceae) of Nepal

2018 ◽  
Vol 30 ◽  
pp. 28-38
Author(s):  
Baba Maiya Pradhan ◽  
Devendra M. Bajracharya
Keyword(s):  
Leaf Surface ◽  
Morphological Characters ◽  
Epidermal Cells ◽  
Stomatal Index ◽  
Taxonomic Significance ◽  
Stomatal Frequency ◽  
Complex Type ◽  
Surface Type ◽  
Stomatal Complex ◽  
The Family

Dendrobium Swartz is one of the largest and most problematic genus of the tribe Dendrobieae of the family Orchidaceae. Nepal harbors about thirty-one species of Dendrobium. Micro morphological characters like the stomatal complex in fifteen species of DendrobiumSwartz (Orchidaceae) of Nepal were studied for understanding the taxonomic significance of stomatal complex within the genus. For the study of stomatal complex of leaf, Carpenter’smethod was followed. Stomatal index and stomatal frequency were calculated using formulagiven by Salisbury. The terminologies used for the stomatal complex type were followed those of Patel. In all species the leaf surface was found hypostamic. Tetracytic (a-tetra-monocyclic,b-tetra-monocyclic and c-tetra-monocyclic) and eupara twi-monocyclic with hexa-monocyclictypes of stomata were recorded in the genus. Tetracytic type was found in fourteen species and eupara twi-monocyclic with hexa-monocyclic was found in only one species. The elliptical shape of stomata was found in more species than the circular shape. The epidermal cells of leaf was found rectangular, square, polygonal to irregular. The distribution of stomata on leaf surface, type of stomata and shape of epidermal cells were found to be taxonomically significant. These characters could be used as distinguishing characters to delimit the species in the genus.

scholarly journals Leaf Epidermal Micromorphology of Portulaca L. Species Found in Vadodara, Gujarat, India

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Archana Srivastava ◽  
Aruna Girish Joshi ◽  
Vinay Madhukar Raole
Keyword(s):  
Light Microscopy ◽  
Epidermal Cells ◽  
Correct Identification ◽  
Stomatal Index ◽  
Stomatal Frequency ◽  
Diagnostic Features ◽  
Mean Size ◽  
The Mean

Micromorphology of three species of Portulaca was carried out with the help of light microscopy to determine variations within the species which would aid in correct identification of the plants. Epidermal cells are polygonal with sinuous anticlinal walls in all the three species. Length of epidermal cells of P. grandiflora Hook. is higher than P. oleracea Linn. and P. quadrifida Linn. The leaves of P. quadrifida are epistomatic while the remaining species are amphistomatic with paracytic stomata in all the three species. Mean stomatal index and stomatal frequency are more in P. quadrifida while the mean size of stomata (both length and width) is larger in P. grandiflora for both adaxial and abaxial surfaces. Based on the diagnostic features, an artificial indented key is prepared.

scholarly journals The morphometric and numerical analysis of five species of Eragrostis sp. Wolf. based on silica bodies in leaf epidermal cells

2018 ◽  
Vol 7 (5) ◽  
pp. 2213 ◽  
Author(s):  
Shilpa Dinda ◽  
Amal Kumar Mondal
Keyword(s):  
Numerical Analysis ◽  
Characteristic Feature ◽  
Morphological Characters ◽  
Epidermal Cells ◽  
Characteristic Structure ◽  
The Family ◽  
Different Types ◽  
Eragrostis Atrovirens

Many plants take up soluablemonosilicic acid from the soil. Some of these plants subsequently deposit it as cell inclusions of characteristic structure commonly known as silica bodies or phytolith. In the family Poaceae, different types of silica bodies are characteristic feature of the different subfamily. Eragrostis sp., belonging to the subfamily Chloridoideae. These micro-morphological characters of silica bodies of five species of Eragrostissp applied numerically by UPGMA method. Out of five species Eragrostis atrovirens and Eragrostis gangetica are very closely related and their pairing affinity value is 90%.

Leaf epidermal characters of Brazilian species of Solanum section Torva as taxonomic evidence

Botany ◽  
2012 ◽  
Vol 90 (9) ◽  
pp. 806-814 ◽  
Author(s):  
Kiriaki Nurit-Silva ◽  
Rafael Costa-Silva ◽  
Ionaldo J.L.D. Basílio ◽  
Maria de Fátima Agra
Keyword(s):  
Cell Walls ◽  
Wave Pattern ◽  
Morphological Characters ◽  
Epidermal Cells ◽  
Leaf Epidermis ◽  
Taxonomic Significance ◽  
Abaxial Surface ◽  
Solanum Torvum ◽  
Different Types ◽  
Additional Support

To evaluate their taxonomic significance, the yet unknown epidermal characters of the leaves of 10 species of Solanum section Torva Nees (Solanaceae) from Brazil were determined using light and scanning electron microscopy. Our results indicated that the leaf epidermis showed epidermal cells of straight to wavy outlines. The curved pattern of anticlinal cell walls was predominant on the adaxial surface, and the wave pattern was predominant on the abaxial surface. Leaves are amphistomatic in six species ( Solanum acutilobum Dunal, Solanum bonariense L., Solanum guaraniticum A. St.-Hil., Solanum metrobotryon Dunal, Solanum scuticum M. Nee, and Solanum torvum Sw.) and hypostomatic in four species ( Solanum adspersum Witasek, Solanum paniculatum L., Solanum subumbellatum Vell., and Solanum variabile Mart.). Four different types of stomata (anisocytic, anomocytic, paracytic, and diacytic) were recognized, with the anisocytic type predominant on adaxial and abaxial surfaces. The combination of some micro-morphological characters such as density, distribution and type of stellate trichomes, the anticlinal walls of epidermal cells, and also the type and distribution of stomata proved to be the most useful and distinctive characters for the separation of species. This set of characters also may help as additional support in quality control of species having medicinal importance.

Characterization of stomatal development in Dianthus chinensis

1988 ◽  
Vol 66 (1) ◽  
pp. 142-149 ◽  
Author(s):  
Thalia Pappas ◽  
Patricia McManus ◽  
Peter Vanderveer ◽  
Judith Croxdale
Keyword(s):  
Leaf Blade ◽  
Leaf Surface ◽  
Guard Cells ◽  
Stomatal Development ◽  
Stomatal Frequency ◽  
Stomatal Complex ◽  
Adaxial Surface ◽  
Abaxial Leaf Surface ◽  
Area Basis

Stomatal differentiation in Dianthus chinensis leaves was characterized structurally and functionally using plants of the seventh plastochron. Development of stomata was followed using scanning electron microscopy. The maturity of the stomatal complex, the existence of an open stomatal pore, and the localization of K+ within guard cells were used as indicators of stomatal function. The results showed that stomatal development spanned a 10- to 12-day period, which began on the fourth youngest pair of leaves and was completed in the middle of the blade of the sixth youngest leaf pair where stomatal function was acquired. Stomatal frequency on an area basis decreased from the base to the tip of the leaf blade and from the abaxial to the adaxial surface of the leaf. There was a 10-fold decline in the frequency of stomata during leaf maturation; frequency on the abaxial leaf surface was about twice that on the adaxial surface. Dimensions of the antechamber aperture changed during development but at maturity exhibited a range of lengths and widths that was independent of stomatal location on the leaf. The localization of K+ in guard cells occurred only in the later stages of differentiation and was absent in stomata of senescing leaves.

Micromorphologie des épidermes foliaires chez quelques espèces de Medicago

1983 ◽  
Vol 61 (12) ◽  
pp. 3461-3470 ◽  
Author(s):  
Catherine Damerval
Keyword(s):  
Guard Cell ◽  
Stomatal Density ◽  
Epidermal Cells ◽  
Cell Length ◽  
Leaf Epidermis ◽  
Trichome Density ◽  
Stomatal Index ◽  
Annual Species ◽  
Abaxial Epidermis ◽  
Stomatal Complex

The micromorphology of the abaxial epidermis of the first and sixth leaf has been studied in seven annual species of Medicago L. The pattern of the epidermal cells and of the stomatal complex does not allow differentiation of the taxa. Three main types of trichomes are recognized on the two foliar levels; their localization on the first leaf epidermis allows identification of five taxa out of seven. Four quantitative variables are also examined: stomatal density, trichome density, guard cell length, and stomatal index. The variable having the best discriminant value is the guard cell length on the first leaf. It is possible to identify each of the seven species by a combination of two features: the localization of the types of trichomes on the first leaf and the stomatal density on the sixth leaf.

scholarly journals Micromorphological Studies of the Genus Ipomoea L. (Convolvulaceae) in Nepal

2017 ◽  
Vol 5 (1) ◽  
pp. 16-23
Author(s):  
Saugat Shrestha ◽  
Nawal Shrestha ◽  
Sangeeta Rajbhandary
Keyword(s):  
Pollen Grains ◽  
Morphological Characters ◽  
Stomatal Frequency ◽  
Qualitative And Quantitative ◽  
Quantitative Characters ◽  
Pollen Characters ◽  
The Family ◽  
Ecological Implications ◽  
Structural Differences ◽  
The Tropics

Ipomoea is a large and complex genus, which comprises the largest number of species within the family Convolvulaceae. Globally, the genus consists of about 600 species of vines and shrubs, which are widely distributed throughout the tropics and the subtropics. In Nepal, the genus comprises 15 species, which are distributed throughout the tropical, subtropical and temperate region of the country. Besides few enumerations and floristic surveys, no comprehensive anatomy and pollen characters of 16 species of Ipomoea occurring in Nepal to evaluate the qualitative and quantitative differences in these characters. We found that the all species of Ipomoea have paracytic type stomata. However, there is considerable variation in the size and frequency of the stomata. The size and shape of the epidermal cells also varies from species to species. Ipomoea nil has the highest stomatal frequency, while I. purpurea has the lowest frequency. All species of Ipomoea have globose, isopolar, echinate, pentoporate and radially symmetrical pollen grains. I. quamoclit has the largest pollen, while I. aquatica has the smallest pollen. The anatomy of stem shows no distinct structural differences among species. Although no qualitative differences in the studied characters are found among species, there is considerable variation in the quantitative characters, such as the size of stomata, frequency of stomata and pollen size. These characters could have important taxonomic and ecological implications and therefore, are as valuable as the morphological characters.

Taxonomic significance of morphological characters of spores in the family Ophioglossaceae (Psilotopsida)

2018 ◽  
Vol 252 ◽  
pp. 77-85 ◽  
Author(s):  
Natalia Olejnik ◽  
Zbigniew Celka ◽  
Piotr Szkudlarz ◽  
Myroslav V. Shevera
Keyword(s):  
Morphological Characters ◽  
Taxonomic Significance ◽  
The Family

Three new species, two new genera, and new family Biphragmosagittidae (Сhaetognatha) from Southwest Pacific Ocean

2011 ◽  
Vol 20 (1) ◽  
pp. 161-173
Author(s):  
A.P. Kassatkina
Keyword(s):  
New Species ◽  
Type Species ◽  
Morphological Characters ◽  
The Body ◽  
New Order ◽  
New Genera ◽  
New Family ◽  
The Family ◽  
Three New Species

Resuming published and own data, a revision of classification of Chaetognatha is presented. The family Sagittidae Claus & Grobben, 1905 is given a rank of subclass, Sagittiones, characterised, in particular, by the presence of two pairs of sac-like gelatinous structures or two pairs of fins. Besides the order Aphragmophora Tokioka, 1965, it contains the new order Biphragmosagittiformes ord. nov., which is a unique group of Chaetognatha with an unusual combination of morphological characters: the transverse muscles present in both the trunk and the tail sections of the body; the seminal vesicles simple, without internal complex compartments; the presence of two pairs of lateral fins. The only family assigned to the new order, Biphragmosagittidae fam. nov., contains two genera. Diagnoses of the two new genera, Biphragmosagitta gen. nov. (type species B. tarasovi sp. nov. and B. angusticephala sp. nov.) and Biphragmofastigata gen. nov. (type species B. fastigata sp. nov.), detailed descriptions and pictures of the three new species are presented.

scholarly journals Taxonomic significance of leaf surface morphology inAloesectionPictae(Xanthorrhoeaceae)

2009 ◽  
Vol 160 (4) ◽  
pp. 418-428 ◽  
Author(s):  
OLWEN M. GRACE ◽  
MONIQUE S. J. SIMMONDS ◽  
GIDEON F. SMITH ◽  
ABRAHAM E. VAN WYK
Keyword(s):  
Surface Morphology ◽  
Leaf Surface ◽  
Taxonomic Significance
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