Influence, chez le Manihot esculenta, du développement de la lame du limbe sur celui du pétiole et de l'entre-noeud sous-jacent

1992 ◽  
Vol 70 (10) ◽  
pp. 2053-2065 ◽  
Author(s):  
R. Médard ◽  
J. M. N. Walter ◽  
P. Barnola
Keyword(s):  
Key Words ◽  
Vascular Bundle ◽  
Manihot Esculenta ◽  
Vascular Development ◽  
Vascular Bundles ◽  
Mechanical Pressure ◽  
Vascular Tissues ◽  
Growth Area

Within each internode and about four plastochrons after its formation, an intercalary growth area appears, leading to a continued lengthening due essentially to anticline mitoses. It temporarily looks like a cambium. The blade of the leaf which is directly above the internode is absolutely necessary for the formation of this growth area. Xylem integrity of the cauline vascular bundle connected with this leaf is also required. Within each leaf, the presence of the blade and the integrity of vascular bundles are also indispensable for the lengthening of the petiole, whose mitotic system resembles the internode's. The hypothesis of a blade influence on the mitotic lengthening system through mechanical pressure due to the vascular development is discussed. Key words: internode, petiole, blade, vascular tissues, Manihot esculenta, intercalary growth.

Vascular system of the fertile spikelet of Sorghum (Gramineae: Panicoideae)

1991 ◽  
Vol 69 (3) ◽  
pp. 656-670 ◽  
Author(s):  
Thompson Demetrio Pizzolato
Keyword(s):  
Key Words ◽  
Hollow Cylinder ◽  
Vascular Bundle ◽  
Vascular System ◽  
The Other ◽  
Vascular Bundles ◽  
The Many ◽  
Large Vascular Bundle ◽  
Fertile Spikelet

The vascular system of the sessile, fertile spikelet of Sorghum was reconstructed from serial transverse sections. The vascular system is a composite of the basipetal extensions of the traces from the appendages on the rachilla. The rachilla immediately above the glumes consists of an outer and an inner series of these vascular extensions. The basipetal continuations of the median traces of the sterile and fertile lemmas, and of the traces from the stamens comprise the inner series. The outer series consists of the continuations of the many lodicule traces and of vascular bundles descending from the posterior of the pistil. The component of the vascular system related to the pistil is a plexus of xylem and phloem in the form of a hollow cylinder traversed by a large vascular bundle that is the basipetal continuation of the stylar bundles. Bundles from the anterior of the pistil merge with the hollow cylinder at its anterior. Several collateral bundles from the placenta merge with the hollow cylinder at its posterior. Distal portions of these placental bundles supply the short chalaza of the ovule but do not enter it. The vascular system of the fertile spikelet of Sorghum is typical of the Panicoideae, and is useful in distinguishing the Panicoideae from the other subfamilies of grasses. Key words: Sorghum, spikelet, floret, vascular system.

Functional leaf anatomy and ultrastructure in a marine angiosperm, Syringodium isoetifolium (Aschers.) Dandy (Cymodoceaceae)

1993 ◽  
Vol 44 (1) ◽  
pp. 59 ◽  
Author(s):  
J Kuo
Keyword(s):  
Vascular Bundle ◽  
Leaf Blade ◽  
Small Region ◽  
Total Surface Area ◽  
Epidermal Cells ◽  
Secretory Cells ◽  
Vascular Bundles ◽  
Mesophyll Cells ◽  
Vascular Tissues ◽  
Syringodium Isoetifolium

The terete leaf blade of Syringodium isoetifolium (Aschers.) Dandy from south-western Australia has uniformly small epidermal cells and a few large secretory cells. Mesophyll tissues contain several air lacunae, a central longitudinal vascular bundle, and eight to twelve peripheral longitudinal vascular bundles, but no fibre bundles. The total volume of air lacunae is about 10% that of the leaf blades, but the total surface area of air lacunae is similar to that of leaf blades. The leaf cuticle appears as a thin, electron-transparent layer. Leaf-blade epidermal cells have a large central vacuole and peripheral cytoplasm containing many chloroplasts that lack starch grains. Wall ingrowths are absent. However, the small region between the walls and the plasmalemma could play an important role in nutrient absorption. Plasmodesmata appear to be absent between adjacent epidermal cells, and also between epidermal and mesophyll cells, suggesting that there is only an apoplastic pathway for the transport of photosynthate to the vascular tissues. Each vascular bundle is surrounded by a layer of sheath cells, which are characterized by the presence of suberized lamellae in their walls. These may act to reduce the apoplastic exchange of solutes and water between the mesophyll and vascular tissues. Xylem elements, represented by large lumens and intensely hydrolysed walls, may not be present in all peripheral vascular bundles. Two types of sieve elements occur in S. isoetifolium leaf blades: normal thin-walled ones with large lumens, and thick-walled ones with reduced lumens, representing the photophloem and the metaphloem, respectively.

scholarly journals Erect culm internodal anatomy and properties of sun ecotype of Imperata cylindrica (L.) P. Beauv

2015 ◽  
Vol 44 (1) ◽  
pp. 67-72
Author(s):  
SN Sima ◽  
AK Roy ◽  
N Joarder
Keyword(s):  
Vascular Bundle ◽  
Vascular Tissue ◽  
Leaf Sheath ◽  
Imperata Cylindrica ◽  
Vascular Bundles ◽  
Peripheral Vascular ◽  
Phloem Tissue ◽  
Vascular Tissues

Internodal anatomy of Imperata cylindrica (L.) P. Beauv. was described in this paper. Culm internodes were completely encircled by leaf sheath. Peripheral vascular bundles were many in number and small in size. Central bundles were large in size and a few in number. Large bundles were of various sizes and vascular tissues well developed. Each vascular bundle had strong mass of sclerenchyma tissue arching over the phloem in the form of phloem hood. Small bundles were poorly developed in respect of vascular tissue. A small percentage of vascular bundle consisted of phloem tissue only fundamental ground tissues were parenchyma in nature. DOI: http://dx.doi.org/10.3329/bjb.v44i1.22725 Bangladesh J. Bot. 44(1): 67-72, 2015 (March)

scholarly journals Knockout of Auxin Response Factor SlARF4 Improves Tomato Resistance to Water Deficit

2021 ◽  
Vol 22 (7) ◽  
pp. 3347
Author(s):  
Mengyi Chen ◽  
Xiaoyang Zhu ◽  
Xiaojuan Liu ◽  
Caiyu Wu ◽  
Canye Yu ◽  
...  
Keyword(s):  
Water Stress ◽  
Water Deficit ◽  
Vascular Bundle ◽  
Plant Resistance ◽  
Quantitative Polymerase Chain Reaction ◽  
Photochemical Efficiency ◽  
Differentially Expressed ◽  
Vascular Bundles ◽  
Aba Signaling ◽  
Auxin Response

Auxin response factors (ARFs) play important roles in various plant physiological processes; however, knowledge of the exact role of ARFs in plant responses to water deficit is limited. In this study, SlARF4, a member of the ARF family, was functionally characterized under water deficit. Real-time fluorescence quantitative polymerase chain reaction (PCR) and β-glucuronidase (GUS) staining showed that water deficit and abscisic acid (ABA) treatment reduced the expression of SlARF4. SlARF4 was expressed in the vascular bundles and guard cells of tomato stomata. Loss of function of SlARF4 (arf4) by using Clustered Regularly Interspaced Short Palindromic Repeats/Cas 9 (CRISPR/Cas 9) technology enhanced plant resistance to water stress and rehydration ability. The arf4 mutant plants exhibited curly leaves and a thick stem. Malondialdehyde content was significantly lower in arf4 mutants than in wildtype plants under water stress; furthermore, arf4 mutants showed higher content of antioxidant substances, superoxide dismutase, actual photochemical efficiency of photosystem II (PSII), and catalase activities. Stomatal and vascular bundle morphology was changed in arf4 mutants. We identified 628 differentially expressed genes specifically expressed under water deficit in arf4 mutants; six of these genes, including ABA signaling pathway-related genes, were differentially expressed between the wildtype and arf4 mutants under water deficit and unlimited water supply. Auxin responsive element (AuxRE) elements were found in these genes’ promoters indicating that SlARF4 participates in ABA signaling pathways by regulating the expression of SlABI5/ABF and SCL3, thereby influencing stomatal morphology and vascular bundle development and ultimately improving plant resistance to water deficit.

scholarly journals Mechanical behavior of 'Niagara Rosada' grape berry detachment

2011 ◽  
Vol 31 (6) ◽  
pp. 1115-1122 ◽  
Author(s):  
Daniel Gomes ◽  
Antonio C. de O Ferraz
Keyword(s):  
Mechanical Behavior ◽  
Vascular Bundle ◽  
Traction Force ◽  
Grape Berry ◽  
Vascular Bundles ◽  
Test Results ◽  
Deformation Curves ◽  
Considerable Portion ◽  
Surrounding Skin ◽  
Niagara Rosada

The 'Niagara Rosada' grape is the main Brazilian table grape belonging to the Labrusca family. It develops medium, cylindrical and compact bunches with berries presenting a pinkish skin and a foxy flavor that is valued in the Brazilian market. These berries are tender and have a pedicel-berry connection provided by the vascular bundles and surrounding skin. This cultivar is very susceptible to berry drop mainly caused by vibration and senescence. The objective of this study was to evaluate the temporal mechanical behavior of the pedicel-berry detachment, using resistance indexes extracted from traction force-deformation curves. Test results showed two different detachment types. In the first one, which exhibited higher average resistance, a considerable portion of the vascular bundle came out attached to the pedicel and in the second type; the vascular bundle was retained inside the berry. The proposed indexes based on maximum detachment force, force at 0.2; 0.5; 1.0 and 1.2 mm, and maximum force to corresponding deformation ratio did not discriminate the senescence of the berry.

Taxonomic significance of leaf and stem anatomy of Agalinis (Scrophulariaceae) from the U.S.A. and Canada

1991 ◽  
Vol 69 (9) ◽  
pp. 1935-1950 ◽  
Author(s):  
Judith M. Canne-Hilliker ◽  
Christine M. Kampny
Keyword(s):  
Key Words ◽  
North American ◽  
Fiber Bundles ◽  
Perennial Species ◽  
Taxonomic Significance ◽  
Stem Anatomy ◽  
Vascular Tissues ◽  
Anatomical Characters

Features of foliar and stem anatomy of 26 annual and 1 perennial species of North American Agalinis were examined from over 200 population samples. Several species including A. aphylla, A. densiflora, A. filicaulis, A. heterophylla, A. linifolia, A. maritima, and A. oligophylla have distinctive anatomy. Evidence from anatomy supports a reclassification of North American Agalinis at the sectional and subsectional ranks. Agalinis aphylla and A. oligophylla are allied with species of section Erectae, not section Purpureae subsection Setaceae. Agalinis edwardsiana (from section Tenuifoliae) and A. aspera (section Asperae) are most similar to members of section Purpureae subsection Pedunculares. Agalinis tenuifolia (section Tenuifoliae) is similar to species of section Purpureae subsection Purpureae. Anatomical characters range from those usually regarded as xeromorphic to those typical of hydromorphic species. However, different xeromorphic characters are present in species of sections Purpureae, Erectae, and Tenuifoliae. Species of section Purpureae subsection Setaceae have filiform, adaxially grooved leaves; species of section Erectae have narrow, short sclerenchyma-reinforced leaves and very slender stems usually having fiber bundles in their ridges. Species that we retain in section Tenuifoliae have a cylinder of sclerenchyma between the vascular tissues and the fiber-laden cortex. Key words: Agalinis, Scrophulariaceae, anatomy, systematics, taxonomy.

Early ontogeny defines the diversification of primary vascular bundle systems in angiosperms

2020 ◽  
Author(s):  
Regine Claßen-Bockhoff ◽  
Doris Franke ◽  
Hansjörg Krähmer
Keyword(s):  
Vascular Bundle ◽  
Vascular Tissue ◽  
Three Dimensional ◽  
Early Ontogeny ◽  
Leaf Primordia ◽  
Dimensional System ◽  
Vascular Bundles ◽  
Histological Data ◽  
Molecular Aspects ◽  
The One

Abstract Understanding vascular bundle systems in angiosperms is a challenge. On the one hand, the vascular tissue is extremely important in reconstructing the evolution and survivability of plants, but on the other hand, it forms a complicated three-dimensional system of controversially discussed phylogenetic and ontogenetic origin. To increase clarity, in this paper we briefly summarize histological, phylogenetic and molecular aspects of primary vascular bundle formation in angiosperms, adding histological data on early stages of vascular bundle formation, proposing a concept combining the different views and providing simplified illustrations to improve the understanding of primary vascular systems in angiosperms. Based on the auxin hypothesis, vascular bundle formation is stimulated by the development of leaf primordia. Provascular domains appear at the base of the leaf primordia and develop into two directions (leaf, internode). The low vs. high number of internodal bundles, their circular vs. scattered arrangement and the open vs. closed bundle construction in eudicots vs. monocots can be deduced to be due to processes below the shoot apical meristem. The most important processes distinguishing monocots from eudicots are the isolated bundle initiation outside the primary meristem, the enormous expansion of the leaf bases associated with a high number of vascular bundles and the early onset of primary thickening passively dislocating vascular bundles.

scholarly journals Anatomical Structure and Terpenoid Content of Zodia (Evodia suaveolens Scheff) Leaves

2020 ◽  
Vol 20 ◽  
pp. 03001
Author(s):  
Evi Mintowati Kuntorini ◽  
Dewi Nofaliana ◽  
Eny Dwi Pujawati
Keyword(s):  
Vascular Bundle ◽  
Anatomical Structure ◽  
Vascular Bundles ◽  
Oil Glands ◽  
Abaxial Epidermis ◽  
Embedding Method ◽  
Histochemical Assay ◽  
Paraffin Embedding ◽  
Histochemical Test ◽  
Leaf Anatomical Structure

Zodia (Evodia suaveolens Scheff) is a member of Rutaceae contain terpenoids, triterpenoids, alkaloids, flavonoids, and xanthones which have anti-mosquito activity. This research aimed to observe the anatomical structure, the location, and distribution of terpenoid based on the leaves' age. Anatomical slides preparation of leaves were made using the paraffin embedding method with safranin staining. The distribution of terpenoid was analyzed by the histochemical assay. Leaf anatomical structure shows that the 3rd and 6th leaf bifacial (dorsiventral) consisted of the upper epidermis, mesophyll (palisade and sponge), collateral vascular bundle, parenchyma midrib, abaxial epidermis and oil glands in mesophyll that is underneath both epidermises. The diameter of oil glands with larger sizes was on the 6th leaf, whereas the density is not different in the 3rd and 6th leaves. The histochemical test showed that terpenoid was observed in the leaf vascular bundles, oil glands, and epidermis.

scholarly journals Morphology, palynology, and stipe anatomy of four common ferns from Pekanbaru, Riau Province, Indonesia

2018 ◽  
Vol 20 (1) ◽  
pp. 327-336
Author(s):  
NERY SOFIYANTI ◽  
DYAH IRIANI ◽  
FITMAWATI FITMAWATI ◽  
AFNI ATIKA MARPAUNG
Keyword(s):  
Vascular Bundle ◽  
Morphological Characters ◽  
Similar Type ◽  
Vascular Bundles ◽  
Anatomical Data ◽  
Digital Microscope ◽  
Fern Species ◽  
Study Sites ◽  
Dicranopteris Linearis ◽  
Paraffin Method

Sofiyanti N, Iriani D, Fitmawati, Marpaung AA. 2019. Morphology, palynology, and stipe anatomy of four common ferns from Pekanbaru, Riau Province, Indonesia. Biodiversitas 20: 327-336. The fern explorations had been conducted in Pekanbaru, Riau Province from 2013 to 2017. The objectives of this study were to characterize the morphological characters, to examine the spore features and stipe anatomy characters of four common ferns from Pekanbaru. The specimens were collected from the fields using the exploration method from 21 study sites from 10 sub-districts. The spores were then observed using a digital microscope. A total of four fern species were known as the most common fern species in this region, i.e., Dicranopteris linearis, Stenochlaena palustris, Nephrolepis biserrata, and Davalia denticulata. This study examined the morphology, palynology and stipe anatomy of these four common ferns from Pekanbaru, Riau. The anatomical preparation was conducted using paraffin method while spore preparation using acetolysis method. We found dimorphic ferns (Stenochlaena palustris and Davallia denticulata) and monomorphic ferns (Dicranopteris linearis and Nephrolepis biserrata). The vascular bundle of stipes of four species examined is similar, i.e., amphicribral concentric, however, the vascular bundles within the species varies in size. We also observed similar type of stele, atactostele, among the species. The spore features found in this study were monolete and trilete with prolate and subprolate shape. The result of this study supports the anatomical data of the examined species.

scholarly journals Localization of Peroxidase in Grapes using Nitrocellulose Blotting of Freezing/Thawing Fruits

HortScience ◽  
1993 ◽  
Vol 28 (1) ◽  
pp. 38-40 ◽  
Author(s):  
Antonio A. Calderón ◽  
Jose M. Zapata ◽  
Romualdo Muñoz ◽  
A. Ros Barceló
Keyword(s):  
Vitis Vinifera ◽  
Vascular Bundle ◽  
Peroxidase Activity ◽  
Histochemical Localization ◽  
Vascular Bundles ◽  
Reaction Products ◽  
Tissue Sections ◽  
Bundle Structure

A technique has been developed to study the histochemical localization of peroxidase in Vitis vinifera by blotting freezing/thawing tissue sections on nitrocellulose membranes. After being stained with 4-methoxy- α -naphthol and H2O2, peroxidase-mediated reaction products in mature `Gamay' grapes were seen principally in the skin and, to a lesser extent, the pericarp, where discrete areas of reaction products were located in the vascular bundles. However, for immature `Gamay' and `Grenache' grapes, peroxidase activity in the skin was low and similar to that found in the pericarp. With this technique, fruit vascular bundle structure was preserved. The reliability of the technique in the histochemical localization of peroxidase in grapes was confirmed by fractionation and determining the peroxidase activity in the various tissues.

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