Tbe cuticle is well developed and forrns many creases on the epidermis surface. Get a printable copy pdf file of the complete article 177k, or click on a page image below to browse page by page. The upper or outer layer of the two main layers of cells that make up the skin. Lamiaceae many ornamentals are also present in this the mint family 252 genera 6,800 species distribution. Leaves opposite, rarely whorled or alternate, simple to pinnately dissected or compound, without stipules. Pdf biological activity of diterpenoids isolated from. In the family lamiaceae, four kinds of stomata were found anomocytic, anisocytic, diacytic, and actinocytic. The outermost layer of the crosssection of petiole consists of epidermis cells.
The diameter of the stem cortex, centrai cylinder, pith, the height of the leaf and bract epidermal celi s, the thickness of the palisade tissue, the number of the. It includes about 210 genera and about 3,500 species. Stem and leaf anatomy of plectranthus neochilus schltr. The aerial epidermis originates in the shoot apical meristem, the root epidermis in the root apical meristem and the seedling epidermis arises by isolation of the outer layer during embryogenesis. Based on these characters a taxonomic key was developed to delimit the closely related taxa. Whereas previously only regarded as an innocuous commensal microorganism on the human skin, staphylococcus epidermidis is nowadays seen as an important opportunistic pathogen. These include ajugoideae, lamioideae, nepetoideae, prostantheroideae, scutellarioideae, and symphorematoideae. An integument or outer layer of various invertebrates. Dermis and epidermis are basically protective outer layers of the body. The outermost cells of the epidermis are dead and are continuously shed. Lamiaceae or labiatae, also known as the mint family, is a family of plants. Trichomes are defined as unicellular or multicellular appendages, which originate from the epidermal cells and develop outwards on the surface of various plant.
Share your knowledge share your word file share your pdf file share your ppt file. Members of the family are best known for their opposite leaves. Many of the plants are aromatic in all parts and include widely used culinary herbs like basil, mentha, rosemary, sage, savory, marjoram, oregano, hyssop, thyme, lavender. Bring the tribes, the foreign bodyassociated infections usually come from the endogenous flora of patients. Biological activity of diterpenoids isolated from anatolian lamiaceae plants. The epidermis the uppermost layer of skin is an important system that creates our skin tone, while the dermis the middle layer contains connective tissue, hair follicles, and sweat glands that help regulate the integrity and temperature of our the skin.
It has been considered closely related to verbenaceae but 1990s phylogenetic studies have shown that a lot of the genera classified in verbenaceae belong instead in lamiaceae, whereas the core genera of verbenaceae are not closely related to lamiaceae and are more. Crosssections of the leaf blades of lamium truncatum. Statistical comparative petiol anatomy of salvia sp. The large lamiaceae formerly labiatae is found worldwide, with great diversity in california, mexico, and the mediterranean region the plants live in a wide variety of habitats, although many are drought adapted this is one of the few families usually recognized on the basis of vegetative features, a triplet of characters. The family is particularly important to humans for herb. The epidermis is the outermost of the three layers that make up the skin, the inner layers being the dermis and hypodermis. The deepest part of the epidermis also contains melanocytes.
Lamiaceae diversification, evolution, and historical. Laymeeayseeeye or labiatae are a family of flowering plants commonly known as the mint or deadnettle or sage family. Stomata were observed as diacytic, anisocytic, and anomocytic. Perhaps you use sunscreen, and wear a hat and sunglasses.
They form merkel discs, which, in association with nerve endings, serve a sensory function. Cells in the epidermis divide and move up to replace cells in the layers above, changing as they move from one layer to the next. The systematics significance of non glandular ngts and glandular trichomes gts, stomatal complex and epidermal cells of. Get a printable copy pdf file of the complete article 126k, or click on a page image below to browse page by page. That is, the epidermis outermost layer consists of dead cells packed with the tough protein keratin. Hallmark features of stem anatomy in the family lamiaceae. Brannon, md, is a family practice physician in mauldin, south carolina. Cosmopolitan, ranging from tropical forests to arctic tundra and sea level to high altitudes.
There are eglandular and glandular hairs on both surface. The main difference between dermis and epidermis is that dermis is a tissue below the epidermis, containing living cells whereas epidermis is the outermost part of the body, protecting it. Leaves of mentha viridis, ocimum basilicum, melissa officinalis etc. Keratinocytes are the predominant cells in the epidermis, which are constantly generated in the basal lamina and go through maturation, differentiation, and migration to the surface.
The epidermis is 4 layers thick, and are as follows stratum basale, stratum corneum, stratum granulosum, stratum spinosum. Three main populations of cells reside in the epidermis. Thick skin, found on the palms of the hands and soles of the feet, consists of five layers while thin skin consists. Funkcija apsaugoti augalo vidines gleznas dalis nuo mechaniniu pazeidimu, parazitu bei kenkeju, nuo isdziuvimo, taip pat neleidzia is augalo issiplauti. Like other epithelia, the epidermis lacks blood vessels and depends on the diffusion of nutrients from the underlying connective tissue.
The lamiaceae labiatae is one of the most diverse and widespread plant families in terms of ethnomedicine and its medicinal value is based on the volatile oils concentration 1. The exine sculpturing of pollen of studied species was found to be reticulate. Inwards of the angular collenchyma in the corners and the epidermis along the faces is a cortex of parenchyma cells. Foliar epidermal anatomy of lamiaceae with special emphasis on. Lamiaceae r scrophulariaceae f onobrychis r trigonella t ephedra thuja juniperus r. The epidermis is the outermost of three main skin layers. A list of all accepted names in lamiaceae is available in csv format. Epidermal cells were found to be irregular, isodiametric, and rectangular. Merkel cells occur deep in the epidermis at the epidermal.
The epidermis is componed o the ootermost layers o cells in the skin, epi in greek meanin ower or upon, which thegither wi the dermis forms the cutis. Lamiaceae many ornamentals are also present in this salvia. Lamiaceae simple english wikipedia, the free encyclopedia. The plant list includes 22,486 scientific plant names of species rank for the family lamiaceae. When we think of protecting our bodies from the elements, we may think of putting on a jacket, or shoes and socks. There are two layers of epidermis, the living basal layer, which is next to the dermis, and the external stratum corneum, or horny layer, which is composed of dead, keratinfilled cells that have migrated outward from the basal layer. The lamiaceae is a large family of about 230 genera and 6500 species of shrubby herbs including many plants grown in the garden for their aromatic properties. According to hutchinson this is the eightysecond order of the phylum angiospermae, subphylum. Abstract foliar micromorphological features are useful to elucidate the taxonomy and systematics of the lamiaceae species.
Its thin but durable and acts as a protective barrier. Pdf stem and leaf anatomy of plectranthus neochilus. There are currently seven major groups, or subfamilies, recognized in the lamiaceae. Anatomical structures of the petiole are very important in family lamiaceae. The lamiaceae plant family is one of the largest families among the dicotyledons, many species belonging to the family being highly aromatic, due to the. Species of lamiaceae contained within the plant list belong to 250 plant genera.
Taxonomic significance of foliar epidermal morphology in. Hedge herbs, sometimes subshrubs or shrubs, annual or perennial, usually aromatic. The stratum basale is the layer closest to the dermis. Understanding the epidermis the anatomy and function of the skins outermost layer. Lamiaceae species produce a wide array of aromatic compounds which have been used for a number of medicinal purposes including relief from stomach aches, gas and diarrhea. Plant epidermis fulfils a basic protective function, but specialised cells within the epidermis have specific roles. Kolarsick, bs, maria ann kolarsick, msn, arnpc, and carolyn goodwin, aprnbc, fnp chapter 1 introduction the skin is the largest organ of the body, accounting for about 15% of the total adult body weight. The below mentioned article provides an overview on order lamiales, familylamiaceae. Observation on the cotyledonary stomata and trichomes.
Difference between dermis and epidermis definition. Leaves opposite, rarely whorled or alternate, simple to pinnately dissected or. Epidermis definition of epidermis by the free dictionary. There is a main center of diversification in the mediterranean region. Epidermis definition is the outer epithelial layer of the external integument of the animal body that is derived from the embryonic epiblast. In stems and leaves the epidermal cells secrete a cuticle 1, in roots they do not. In older roots and stems the epidermis is often replaced by cork tissue. This character doesnt always hold up with the woody species of the family. The epidermis is a keratinized stratified squamous epithelium. The five layers of the epidermis include the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum and stratum corneum. The family includes 260 genera and 3200 species of world wide distribution.
Constant crosstalk between epidermal cells and their immediate environment is at the heart of epidermal cell fate, and regulates epidermisspeci. Staphylococcus epidermidis the accidental pathogen. Pdf the anatomy, morphology and trichome distribution on the aerial parts of lamium. We use cookies to make interactions with our website easy and meaningful, to better understand the use of our services, and to tailor advertising.
The epidermis is mostly made up of flat, scalelike cells called squamous cells. Epidermis, in zoology, protective outermost portion of the skin. The epidermal cells of both surfaces are more or less. Lamiaceae is distributed nearly worldwide, and many species are cultivated for their fragrant leaves and attractive flowers. Pdf morphology, anatomy and trichome properties of lamium. Summary epidermis differentiation and maintenance are essential for plant survival. The origanum lamiaceae genus is an annual, perennial and shrubby herb that is predominantly distributed around the mediterranean, eurosiberian, and iransiberian regions.
The epidermis in plants is a layer of cells that usually covers the roots, stems, leaves and flowers of plants. Full text full text is available as a scanned copy of the original print version. Abstract foliar epidermal features were based on the micromorphology of trichomes types, epidermal cells and stomatal complex. The deeper hypodermis is made up of fat and even more connective tissue. Lamiaceae family was said to comprise 8 subfamilies before, then this number increased to 10, however, in recent years 2 more subfamilies have been added by the transfer of two new genera from the. Many of the medicinal uses are presumed to be connected to the terpenic constituents of the essential oils of these plants carovicstanko et al. Epidermis definition of epidermis by medical dictionary. The lamiaceae had both hypostomatic and amphistomatic leaf. Stomata are evenly distributed throughout the epidermis without any definite. Arrangement of epidermis, trichomes, cortex, endodermis, pericycle, vascular bundles types and the presence of collenchyma, palisade and. Foliar epidermal anatomy of lamiaceae with special. Family lamiaceae, an introduction the family is distributed worldwide. The epidermis layer provides a barrier to infection from environmental pathogens and regulates the amount of water released from the body into.
Nepetoideae is the largest group in lamiaceae, and it includes 3700 species or approximately half the total species diversity in the family. It performs many vital functions, including protection against external physical. Lamiaceae, formerly called labiatae, the mint family of flowering plants, with 236 genera and more than 7,000 species, the largest family of the order lamiales. Adjacent pairs of leaves are at right angles to each other decussate. The outer, protective, nonvascular layer of the skin of vertebrates, covering the dermis. Morphology of trichomes in pogostemon cablin benth. Name structural components of the normal epidermis and its appendages. Epidermis definition of epidermis by merriamwebster. Stems are often angled or square, with opposite leaves. It is now the most frequent cause of nosocomial infections, at a rate about as high as that due to its more virulent cousin staphylococcus aureus 1. Most not all of our species have a 4angled square stem but square stems occur in several other families as well, and all have simple opposite leaves. Pdf stem and leaf anatomy of three taxa in lamiaceae. Under the squamous cells are round cells called basal cells.
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