Synsets for "abaxial"

Synset: abaxial.a.01

Synonyms: abaxial

Part of Speech: ADJECTIVE

Definition: facing away from the axis of an organ or organism

Examples: the abaxial surface of a leaf is the underside or side facing away from the stem

Lemmas: abaxial dorsal

Hypernym:

Hyponym:

Antonyms: adaxial

    

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Colocasia esculenta It is also used for Anthocyanin study experiments especially with reference to abaxial and adaxial anthocyanic concentration.
Arabidopsis thaliana The establishment of leaf dorsiventrality is important since the dorsal (adaxial) surface of the leaf is different from the ventral (abaxial) surface.
Taxonomy of the Orchidaceae The apostasioid orchids are the most primitive orchids, with only two genera. Neuwiedia has 3 fertile, abaxial (= facing away from the stem) anthers, while "Apostasia" has two fertile abaxial anthers and a filamentous staminode (= a sterile stamen). Plants with mealy or paste-like pollen, which ordinarily are not aggregated into pellets, called pollinia, with two or three fertile long anthers, leaves with sheathing bases, elongated staminode and labellum similar to the petals.
Polylepis Leaf Anatomy: The leaves of all species are built on a dorsiventral arrangement of cells, with the epidermis and palisade layer on the adaxial surface and the spongy tissue on the abaxial surface.
Rhododendron They have frequently been divided based on the presence or absence of scales on the abaxial (lower) leaf surface (lepidote or elepidote). These scales, unique to subgenus "Rhododendron", are modified hairs consisting of a polygonal scale attached by a stalk.
Ranunculus acraeus "R. acraeus" has been mistaken for "R. piliferus" but minute morphological differences distinguish each plant as its own species. "R. acraeus" has finely crenate leaves and bract margins. The plant also has a glabrous peduncle and 6 to 7 sepals that are glabrous on the adaxial surface and hairy on the abaxial surface. Glabrous means that it is smooth, glossy, and not hairy. More specifically, the abaxial surface of the sepal is moderately to densely covered in fine, pilose hair. The adaxial surface of the sepal is glabrous on the proximal part and sparely hairy to glabrous near the distal part. The stems hold one flower apiece. These features distinguish it from the "R. piliferus". "R. piliferus" on the other hand has sepals that are hairy on both the adaxial and abaxial surfaces.
Leaf The xylem typically lies on the adaxial side of the vascular bundle and the phloem typically lies on the abaxial side. Both are embedded in a dense parenchyma tissue, called the sheath, which usually includes some structural collenchyma tissue.
Tomato leaf mold The symptoms of this disease commonly occurs on foliage, and it develops on both sides of the leaf on the adaxial and abaxial surface. The older leaves are infected first and then the disease moves up towards young leaves.
Quercus parvula "Q. parvula" and "Q. wislizeni" never produce newly emerging leaves with a velvety coating of red uniseriate trichomes on the abaxial (upper) surface. This separates them from "Q. kelloggii" and both varieties of "Q. agrifolia" which produce such leaves.
Salvinia "Salvinia", like the other ferns in order Salviniales are heterosporous, producing spores of differing sizes. However, leaf development in "Salvinia" is unique. The upper side of the floating leaf, which appears to face the stem axis, is morphologically abaxial.
Pherosphaera hookeriana Male flowers in compressed, terminal globular cones, ranging from 1-5 mm in diameter, with 8 to 15 fertile scales, each scale has two pollen sacs on the abaxial surface.
Phyllonorycter lemarchandi The larvae feed on "Sida rhombifolia" and "Solanum" species. They mine the leaves of their host plant. The mine has the form of an abaxial, oval, blotch-mine situated close to the base of the leaflet.
Vascular bundle The xylem typically lies adaxial with phloem positioned abaxial. In a stem or root this means that the xylem is closer to the centre of the stem or root while the phloem is closer to the exterior. In a leaf, the adaxial surface of the leaf will usually be the upper side, with the abaxial surface the lower side. This is why aphids are typically found on the underside of a leaf rather than on the top, since the sugars manufactured by the plant are transported by the phloem, which is closer to the lower surface.
Evolutionary history of plants Once the leaf primordial cells are established from the SAM cells, the new axes for leaf growth are defined, one important (and more studied) among them being the abaxial-adaxial (lower-upper surface) axes. The genes involved in defining this, and the other axes seem to be more or less conserved among higher plants. Proteins of the "HD-ZIPIII" family have been implicated in defining the adaxial identity. These proteins deviate some cells in the leaf primordium from the default abaxial state, and make them adaxial. It is believed that, in early plants with leaves, the leaves just had one type of surface — the abaxial one. This is the underside of today's leaves. The definition of the adaxial identity occurred some 200 million years after the abaxial identity was established. One can thus imagine the early leaves as an intermediate stage in evolution of today's leaves, having just arisen from spiny stem-like outgrowths of their leafless ancestors, covered with stomata all over, and not optimized as much for light harvesting.
Pittosporum bicolor Leaves are narrow, and vary in shape from being lanceolate to slightly ovate. They are typically 2–8 cm long and 5-18mm wide, margins are flat or distinctly recurved, with an obtuse to subacute apex. They are alternately arranged along the stem, and, as the name suggests, are most distinct in the contrasting colours of the leaf surfaces. The adaxial surface being a glossy dark green colour, and the abaxial surface being light green to silver-grey in colour. The abaxial surface is heavily coated in fine white hairs, and occasionally the adaxial surface will also have a sparse coating of white hairs.
Apostasia (plant) Like "Neuwiedia" with 3 fertile stamens, the other genus of the same subfamily, "Apostasia" is noted for having 2 fertile, abaxial stamens instead of one like other orchids. The possession of 2-3 abaxial anthers is autapomorphous (= a derived characteristic unique to a taxon) in the Apostasioideae. "Apostasia nuda", "Apostasia elliptica" and "Apostasia latifolia" lack a staminode. This loss of a staminode is an apomorphy (= derived characteristic). The other species are characterized by a staminode that is homologous to the only stamen of monandrous orchids. This presence of a staminode defines an ancestral trait (= plesiomorphic).
Plant evolutionary developmental biology Once the leaf primordial cells are established from the SAM cells, the new axes for leaf growth are defined, one important (and more studied) among them being the abaxial-adaxial (lower-upper surface) axes. The genes involved in defining this, and the other axes seem to be more or less conserved among higher plants. Proteins of the "HD-ZIPIII" family have been implicated in defining the adaxial identity. These proteins deviate some cells in the leaf primordium from the default abaxial state, and make them adaxial. It is believed that in early plants with leaves, the leaves just had one type of surface - the abaxial one. This is the underside of today's leaves. The definition of the adaxial identity occurred some 200 million years after the abaxial identity was established. One can thus imagine the early leaves as an intermediate stage in evolution of today's leaves, having just arisen from spiny stem-like outgrowths of their leafless ancestors, covered with stomata all over, and not optimized as much for light harvesting.
Suture (anatomy) When an angulation of the whorls occurs, the space between it and the suture above it (i.e. the abaxial edge of the sutural ramp) constitutes the area known as the "shoulder" of the shell. The shoulder angle may be simple or keeled, an may sometimes have nodes or spines
Lophosoria quadripinnata The sori, without indusia (covering), are located on the abaxial (lower) surface, on the veins of the last pinnae. The leaf margin does not form part of an indusium, as in other Dicksoniaceae. The sori have numerous hairs (called "filiform paraphyses") between the sporangia. The characteristics and position of the sori are unique and can be used to identify the species.
Helichrysum The receptacle ("base of the flower head") is often smooth, with a fringed margin, or honey-combed, and resemble daisies. They may be in almost all colors, except blue. There are many capitula and generally flat-topped corymbs or panicles. The corolla lobes show glandular hairs at the abaxial surface.