A histological and histochemical comparison of the mucilages on the root tips of several grasses

1980 ◽  
Vol 58 (24) ◽  
pp. 2581-2593 ◽  
Author(s):  
N. K. Miki ◽  
K. J. Clarke ◽  
M. E. McCully
Keyword(s):  
Cell Wall ◽  
Epidermal Cell ◽  
Outer Layer ◽  
Epidermal Cells ◽  
Root Cap ◽  
Carboxyl Groups ◽  
Root Tips ◽  
Sudan Grass ◽  
Epidermal Cell Wall ◽  
Inner Region

Young, axenically grown roots of grasses are covered by two types of mucilage. Gelatinous material originates from the root cap, and a firm, uniformly thick mucilage overlies the columnar epidermal cells. Histochemical properties of these mucilages are similar in corn, wheat, barley, oats, sorghum, and a Sudan grass – sorghum hybrid.The epidermal mucilage has a thin outer and a thicker inner layer distinct from the epidermal cell wall. Both mucilage layers are strongly autofluorescent, birefringent, and PAS positive. Reactions of the outer layer and cell wall indicate carboxyl groups. These are absent from the inner mucilage. Root cap mucilage has a inner region with histochemical properties resembling those of the inner epidermal mucilage. The outer portion of the root cap mucilage is not fluorescent, not birefringent, weakly PAS positive, and carboxylated.

The root–fungus interface as an indicator of symbiont interaction in ectomycorrhizae

1987 ◽  
Vol 17 (8) ◽  
pp. 846-854 ◽  
Author(s):  
H. B. Massicotte ◽  
C. A. Ackerley ◽  
R. L. Peterson
Keyword(s):  
Cell Wall ◽  
Epidermal Cell ◽  
Apical Meristem ◽  
Epidermal Cells ◽  
Wall Ingrowths ◽  
Wall Ingrowth ◽  
Hartig Net ◽  
Epidermal Cell Wall ◽  
Different Strains ◽  
Cell Wall Ingrowths

Seedlings of Alnuscrispa (Ait.) Pursh, Alnusrubra Bong., Eucalyptuspilularis Sm., and Betulaalleghaniensis Britt. were grown in plastic pouches and subsequently inoculated with Alpovadiplophloeus (Zeller & Dodge) Trappe & Smith (two different strains), Pisolithustinctorius (Pers.) Coker & Couch, and Laccariabicolor (R. Mre) Orton, respectively, to form ectomycorrhizae insitu. Alnus seedlings were inoculated with Frankia prior to inoculation with the mycosymbiont. The interface established between A. crispa and A. diplophloeus was complex, involving wall ingrowth formation in root epidermal cells and infoldings in Hartig net hyphae. Alnusrubra – A. diplophloeus ectomycorrhizae had an interface lacking epidermal cell wall ingrowths but with infoldings in Hartig net hyphae. The interface between E. pilularis –. tinctorius consisted of branching Hartig net hyphae between radially enlarged epidermal cells lacking wall ingrowths. Ectomycorrhizae between B. alleghaniensis and L. bicolor developed unique interfaces with radially enlarged epidermal cells near the apical meristem, which synthesized dense vacuolar deposits. Very fine branchings occurred in Hartig net hyphae.

The ultrastructure of the Spilocaea state of Venturia inaequalis in vivo

1976 ◽  
Vol 22 (8) ◽  
pp. 1144-1152 ◽  
Author(s):  
Michael Corlett ◽  
James Chong ◽  
E. G. Kokko
Keyword(s):  
Cell Wall ◽  
Epidermal Cell ◽  
Venturia Inaequalis ◽  
Conidiogenous Cell ◽  
Epidermal Cells ◽  
Apical Region ◽  
Mesophyll Cells ◽  
Epidermal Cell Wall ◽  
Primary Conidium

There are indications that the fungus enzymatically degrades the cuticle and epidermal cell wall. The epidermal cells and to a lesser degree the palisade mesophyll cells beneath a sporulating lesion (susceptible reaction) are killed or seriously disrupted. Various stages of conidiogenesis, including development of the primary conidium, were observed. A conidium is delimited by a two-layered transverse septum. Before conidium secession, a new two-layered inner wall is laid down around the entire conidiogenous cell adjacent to the plasmalemma. The apical region of the new inner wall proliferates beyond the annellation scar left by the seceded conidium and eventually produces another conidium.

Light and electron microscopy of the spermogonial stage of Gymnoconia peckiana, one of the causes of orange rust of Rubus

Botany ◽  
2008 ◽  
Vol 86 (5) ◽  
pp. 533-538 ◽  
Author(s):  
Charles W. Mims ◽  
Elizabeth A. Richardson
Keyword(s):  
Cell Wall ◽  
Epidermal Cell ◽  
Leaf Surface ◽  
Light And Electron Microscopy ◽  
Epidermal Cells ◽  
Wall Material ◽  
Cell Wall Material ◽  
Leaf Epidermis ◽  
Single Nucleus ◽  
Epidermal Cell Wall

Hyphae of Gymnoconia peckiana (Howe in Peck) Trotter spread from infected Rubus argutus Link. stems into leaf primordia where they proliferated in an intercellular fashion as leaves differentiated. Hyphae were septate, and each compartment appeared to contain a single nucleus. Hyphae gave rise to numerous haustoria that resembled the monokaryotic haustoria of other rust fungi. Hyphae located immediately adjacent to the upper and lower leaf epidermis gave rise to spermogonial initials. Each initial consisted of a small group of tightly packed hyphae that developed in an intercellular space adjacent to the epidermis. As an initial enlarged, the proliferating hyphae pushed their way between, as well as into, epidermal cells. Invaded epidermal cells soon died. A layer of spermatiophores then developed within each young spermogonium and appeared to push the epidermal cell wall material and leaf cuticle covering the spermogonium out from the leaf surface. Once mature, spermatiophores gave rise to a succession of uninucleate spermatia that emerged from the tip of each spermatiophore. Spermatia initially accumulated beneath the layer of epidermal cell wall material and cuticle that covered the developing spermogonium and appeared to push this layer further out from the leaf surface until it ruptured. A few receptive hyphae were observed in mature spermogonia.

Development of Colletotrichum trifolii races 1 and 2 on alfalfa clones resistant and susceptible to anthracnose

1988 ◽  
Vol 66 (1) ◽  
pp. 75-81 ◽  
Author(s):  
A. C. L. Churchill ◽  
C. J. Baker ◽  
N. R. O'Neill ◽  
J. H. Elgin Jr.
Keyword(s):  
Cell Wall ◽  
Epidermal Cell ◽  
Pore Formation ◽  
Epidermal Cells ◽  
Germ Pore ◽  
Colletotrichum Trifolii ◽  
Direct Penetration ◽  
Race 1 ◽  
Epidermal Cell Wall ◽  
Race 2

Resistant and susceptible alfalfa clones derived from the cultivar Arc were spray inoculated with conidia from race 1 or race 2 isolates of Colletotrichum trifolii Bain in compatible and incompatible combinations. No significant differences were found in the frequencies of formation of immature or mature appressoria or in germ-pore formation by either race of C. trifolii on resistant or susceptible plants. These results indicate that incompatibility is not associated with the failure of conidia to germinate or to form appressoria with germ pores. In a small number of observations, penetration pegs were observed in tissue of both resistant and susceptible plants. Colletotrichum trifolii initiated infections in alfalfa by direct penetration of the epidermis via a penetration peg from the appressorium. Although the fungus spread rapidly throughout susceptible hosts, we observed fungus penetration only of epidermal cells of resistant hosts. Therefore, it appears that expression of alfalfa resistance to C. trifolii occurs near the time of epidermal cell wall penetration.

scholarly journals Cellulose intrafibrillar mineralization of biological silica in a rice plant

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Eri Nakamura ◽  
Noriaki Ozaki ◽  
Yuya Oaki ◽  
Hiroaki Imai
Keyword(s):  
Cell Wall ◽  
Silica Nanoparticles ◽  
Epidermal Cell ◽  
Rice Plant ◽  
Cellulose Nanofibers ◽  
Rice Husks ◽  
Vital Activity ◽  
Mineralization Process ◽  
Shape Controlled ◽  
Epidermal Cell Wall

AbstractThe essence of morphological design has been a fascinating scientific problem with regard to understanding biological mineralization. Particularly shaped amorphous silicas (plant opals) play an important role in the vital activity in rice plants. Although various organic matters are associated with silica accumulation, their detailed functions in the shape-controlled mineralization process have not been sufficiently clarified. In the present study, cellulose nanofibers (CNFs) were found to be essential as a scaffold for silica accumulation in rice husks and leaf blades. Prior to silicification, CNFs ~ 10 nm wide are sparsely stacked in a space between the epidermal cell wall and the cuticle layer. Silica nanoparticles 20–50 nm in diameter are then deposited in the framework of the CNFs. The shape-controlled plant opals are formed through the intrafibrillar mineralization of silica nanoparticles on the CNF scaffold.

scholarly journals THE STRUCTURE OF THE PRIMARY EPIDERMAL CELL WALL OF AVENA COLEOPTILES

1957 ◽  
Vol 3 (2) ◽  
pp. 171-182 ◽  
Author(s):  
S. T. Bayley ◽  
J. R. Colvin ◽  
F. P. Cooper ◽  
Cecily A. Martin-Smith
Keyword(s):  
Cell Wall ◽  
Outer Wall ◽  
Epidermal Cells ◽  
Cellulose Microfibrils ◽  
X Rays ◽  
Primary Wall ◽  
Normal Type ◽  
Number Of Layers ◽  
Angle Scattering ◽  
Epidermal Cell Wall

The primary walls of epidermal cells in Avena coleoptiles ranging in length from 2 to 40 mm. have been studied in the electron and polarizing microscopes and by the low-angle scattering of x-rays. The outer walls of these cells are composed of multiple layers of cellulose microfibrils oriented longitudinally; initially the number of layers is between 10 and 15 but this increases to about 25 in older tissue. Where epidermal cells touch, these multiple layers fuse gradually into a primary wall of the normal type between cells. In these radial walls, the microfibrils are oriented transversely. Possible mechanisms for the growth of the multilayered outer wall during cell elongation are discussed.

Cell wall structural changes lead to separation and shedding of biofouled epidermal cell wall layers by the brown alga Ascophyllum nodosum

PROTOPLASMA ◽  
2020 ◽  
Vol 257 (5) ◽  
pp. 1319-1331 ◽  
Author(s):  
Laryssa Halat ◽  
Moira E. Galway ◽  
David J. Garbary
Keyword(s):  
Cell Wall ◽  
Epidermal Cell ◽  
Brown Alga ◽  
Structural Changes ◽  
Ascophyllum Nodosum ◽  
Epidermal Cell Wall

Visualization of halos in the epidermal cell wall of Allium cepa caused by Colletotrichum dematium f. circinans and Botrytis allii using fluorochromes

1987 ◽  
Vol 97 (3) ◽  
pp. 137-141 ◽  
Author(s):  
John H. Karabetsos ◽  
A. J. Pappelis ◽  
V. M. Russo
Keyword(s):  
Cell Wall ◽  
Allium Cepa ◽  
Epidermal Cell ◽  
Colletotrichum Dematium ◽  
Botrytis Allii ◽  
Epidermal Cell Wall

Histochemical changes of the epidermal cell wall of barley leaves infected by erysiphe graminis hordei

1968 ◽  
Vol 35 (2) ◽  
pp. 175-180 ◽  
Author(s):  
S. Akai ◽  
H. Kunoh ◽  
M. Fukutomi
Keyword(s):  
Cell Wall ◽  
Epidermal Cell ◽  
Erysiphe Graminis ◽  
Erysiphe Graminis Hordei ◽  
Barley Leaves ◽  
Epidermal Cell Wall ◽  
Histochemical Changes

scholarly journals Fruit Morphology as Taxonomic Features in Five Varieties of Capsicum annuum L. Solanaceae

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Daniel Andrawus Zhigila ◽  
Abdullahi Alanamu AbdulRahaman ◽  
Opeyemi Saheed Kolawole ◽  
Felix A. Oladele
Keyword(s):  
Cell Wall ◽  
Capsicum Annuum ◽  
Epidermal Cell ◽  
Fruit Shape ◽  
Morphological Features ◽  
Fruit Morphology ◽  
Capsicum Annuum L ◽  
Epidermal Cell Wall ◽  
Number Of Seeds

Variations in the fruit morphological features of Capsicum annuum varieties were studied. Varieties studied include var. abbreviatum, var. annuum, var. accuminatum, var. grossum, and var. glabriusculum. The fruit morphology revealed attenuated fruit shape with rounded surfaces in var. glabriusculum, and cordate fruit shape with flexuous surface in var. annuum, abbreviatum and accuminatum. The fruit is a berry and may be green, yellow, or red when ripe. The fruit epidermal cell-wall patterns are polygonal in shape with straight and curved anticlinal walls in all the five varieties. The fruit of var. abbreviatum and var. grossum is trilocular, while that of var. accuminatum and annuum is bilocular, and that of var. glabriusculum is tetralocular. Capsicum annuum var. glabriusculum had the highest mean number of seeds (108.4) and var. annuum had the lowest number of seeds (41.3) per fruit. The fruit is conspicuously hollowed in var. glabriusculum, accuminatum, and annuum but inconspicuously hollowed in var. abbreviatum and var. grossum. These features are shown to be good taxonomic characters for delimiting the five varieties of Capsicum annuum.

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