Cell Wall Polymers of Higher Plants in Peat Formation

2015 ◽  
pp. 122-141
Author(s):  
C. Exarchos ◽  
P. H. Given
Keyword(s):  
Cell Wall ◽  
Higher Plants ◽  
Cell Wall Polymers ◽  
Peat Formation

scholarly journals Effect of Exogenously Applied 24-Epibrassinolide and Brassinazole on Xylogenesis and Microdistribution of Cell Wall Polymers in Leucaena leucocephala (Lam) De Wit

2021 ◽  
Author(s):  
S. Pramod ◽  
M. Anju ◽  
H. Rajesh ◽  
A. Thulaseedharan ◽  
Karumanchi S. Rao
Keyword(s):  
Electron Microscopy ◽  
Cell Wall ◽  
Leucaena Leucocephala ◽  
Higher Plants ◽  
Lignin Content ◽  
Wood Quality ◽  
Wall Structure ◽  
Vessel Element ◽  
Xylem Differentiation ◽  
Cell Wall Polymers

AbstractPlant growth regulators play a key role in cell wall structure and chemistry of woody plants. Understanding of these regulatory signals is important in advanced research on wood quality improvement in trees. The present study is aimed to investigate the influence of exogenous application of 24-epibrassinolide (EBR) and brassinosteroid inhibitor, brassinazole (BRZ) on wood formation and spatial distribution of cell wall polymers in the xylem tissue of Leucaena leucocephala using light and immuno electron microscopy methods. Brassinazole caused a decrease in cambial activity, xylem differentiation, length and width of fibres, vessel element width and radial extent of xylem suggesting brassinosteroid inhibition has a concomitant impact on cell elongation, expansion and secondary wall deposition. Histochemical studies of 24-epibrassinolide treated plants showed an increase in syringyl lignin content in the xylem cell walls. Fluorescence microscopy and transmission electron microscopy studies revealed the inhomogenous pattern of lignin distribution in the cell corners and middle lamellae region of BRZ treated plants. Immunolocalization studies using LM10 and LM 11 antibodies have shown a drastic change in the micro-distribution pattern of less substituted and highly substituted xylans in the xylem fibres of plants treated with EBR and BRZ. In conclusion, present study demonstrates an important role of brassinosteroid in plant development through regulating xylogenesis and cell wall chemistry in higher plants.

scholarly journals Structure, organization, and functions of cellulose synthase complexes in higher plants

2007 ◽  
Vol 19 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Reginaldo A. Festucci-Buselli ◽  
Wagner C. Otoni ◽  
Chandrashekhar P. Joshi
Keyword(s):  
Cell Wall ◽  
Hydrogen Bonding ◽  
Plasma Membrane ◽  
Functional Organization ◽  
Higher Plants ◽  
Cellulose Synthase ◽  
Great Stability ◽  
Close Proximity ◽  
Cell Wall Polymers ◽  
Membrane Bound

Annually, plants produce about 180 billion tons of cellulose making it the largest reservoir of organic carbon on Earth. Cellulose is a linear homopolymer of beta(1-4)-linked glucose residues. The coordinated synthesis of glucose chains is orchestrated by specific plasma membrane-bound cellulose synthase complexes (CelS). The CelS is postulated to be composed of approximately 36 cellulose synthase (CESA) subunits. The CelS synthesizes 36 glucose chains in close proximity before they are further organized into microfibrils that are further associated with other cell wall polymers. The 36 glucose chains in a microfibril are stabilized by intra- and inter-hydrogen bonding which confer great stability on microfibrils. Several elementary microfibrils come together to form macrofibrils. Many CESA isoforms appear to be involved in the cellulose biosynthetic process and at least three types of CESA isoforms appear to be necessary for the functional organization of CelS in higher plants.

In vitro and in vivo polysaccharides assembly: ultrastructural and cytochemical study of growing plant cell wall components.

1978 ◽  
Vol 36 (2) ◽  
pp. 434-435
Author(s):  
D. Reis ◽  
B. Vian ◽  
J. C. Roland
Keyword(s):  
Cell Wall ◽  
Self Assembly ◽  
Plant Cell Wall ◽  
Higher Plants ◽  
Three Dimensional ◽  
Cytochemical Study ◽  
Wall Components

Wall morphogenesis in higher plants is a problem still open to controversy. Until now the possibility of a transmembrane control and the involvement of microtubules were mostly envisaged. Self-assembly processes have been observed in the case of walls of Chlamydomonas and bacteria. Spontaneous gelling interactions between xanthan and galactomannan from Ceratonia have been analyzed very recently. The present work provides indications that some processes of spontaneous aggregation could occur in higher plants during the formation and expansion of cell wall.Observations were performed on hypocotyl of mung bean (Phaseolus aureus) for which growth characteristics and wall composition have been previously defined.In situ, the walls of actively growing cells (primary walls) show an ordered three-dimensional organization (fig. 1). The wall is typically polylamellate with multifibrillar layers alternately transverse and longitudinal. Between these layers intermediate strata exist in which the orientation of microfibrils progressively rotates. Thus a progressive change in the morphogenetic activity occurs.

THE ELECTRON MICROSCOPY OF LEAF SURFACES PRESERVED IN PEAT

1966 ◽  
Vol 44 (4) ◽  
pp. 421-427 ◽  
Author(s):  
John M. Stewart ◽  
Edward A. C. Follett
Keyword(s):  
Electron Microscopy ◽  
Cell Wall ◽  
Calluna Vulgaris ◽  
Surface Features ◽  
Peat Deposits ◽  
Leaf Surfaces ◽  
Definition Of ◽  
Peat Formation ◽  
Physical And Chemical ◽  
Cuticular Surface

Phragmites communis, Eriophorum vaginatum, Calluna vulgaris, and Sphagnum palustre are representative of plants whose remains are frequently encountered in Scottish peat deposits. The effects of preservation in peat on the surface features of their leaves were followed by electron microscopy. Wax projections were observed on the surfaces of mature living leaves of Phragmites and Eriophorum but not on Calluna or Sphagnum. Details of cell wall outlines and stomata (or pores) were clearly defined in Phragmites, Eriophorum, and Sphagnum, but obscured in Calluna. The previous year's leaves differed by displaying a general absence of wax projections, an erosion of the cuticular surface, which took the form of either a loss in definition of the cell wall outlines or a definite etching of the surface, and the presence of numerous microorganisms. The surface features of preserved leaves exhibited to a greater degree this erosion of cell wall outline and cuticular surface. This preliminary study has indicated that major alterations in the submicroscopic features of cuticularized leaf surfaces occur at the leaf litter stage. The primary agents responsible for this degradation would appear to be microorganisms in conjunction with the physical and chemical processes of peat formation.

Bacterial cell wall polymers promote intestinal fibrosis through stimulation of myofibroblast activity

1997 ◽  
Vol 56 ◽  
pp. 406 ◽  
Author(s):  
E.A.F. van Tol ◽  
F.-M. Kong ◽  
R.R. Rippe ◽  
J. Simmons ◽  
P.K. Lund ◽  
...  
Keyword(s):  
Cell Wall ◽  
Bacterial Cell ◽  
Bacterial Cell Wall ◽  
Intestinal Fibrosis ◽  
Cell Wall Polymers ◽  
Stimulation Of

Advances in the study of egg activation of higher plants

Zygote ◽  
2018 ◽  
Vol 26 (6) ◽  
pp. 435-442 ◽  
Author(s):  
Li Peng ◽  
Zhen Kai Li ◽  
Xiao Li Ding ◽  
Hui Qiao Tian
Keyword(s):  
Cell Wall ◽  
Higher Plants ◽  
Egg Activation ◽  
Sperm Cells ◽  
Physiological Changes ◽  
Cell Wall Formation ◽  
Cell Shrinkage ◽  
Functional Relevance ◽  
Polarity Change ◽  
Fertilized Egg

SummaryFertilization in higher plants induces many structural and physiological changes in the fertilized egg, and represents the transition from the haploid female gamete to the diploid zygote, the first cell of a sporophyte. Some changes are induced extremely rapidly following fusion with sperm cells and are the preclusions of egg activation. This review focuses on the early changes that occur in the egg after fusion with sperm cells, but before nuclear fusion. Reported changes include cell shrinkage, cell wall formation, polarity change, oscillation in Ca2+ concentration, and DNA synthesis. In addition, the current understanding of egg activation is summarized and the possible functional relevance of the changes is explored.

Sign in / Sign up

Export Citation Format

Share Document