scholarly journals Morphological and Ultrastructural Changes of Organelles in Leaf Mesophyll Cells of the Arctic and Antarctic Plants of Poaceae Family Under Cold Influence

2015 ◽  
Vol 47 (1) ◽  
pp. 17-25 ◽  
Author(s):  
Irena Giełwanowska ◽  
Marta Pastorczyk ◽  
Wioleta Kellmann-Sopyła ◽  
Dorota Górniak ◽  
Ryszard J. Górecki
Keyword(s):  
The Arctic ◽  
Ultrastructural Changes ◽  
Mesophyll Cells ◽  
Antarctic Plants ◽  
Leaf Mesophyll ◽  
Poaceae Family

Ultrastructure of wilt syndrome caused by Verticillium dahliae. I. In chrysanthemum leaves

1975 ◽  
Vol 53 (9) ◽  
pp. 901-913 ◽  
Author(s):  
Jane Robb ◽  
Lloyd Busch ◽  
B. C. Lu
Keyword(s):  
Verticillium Dahliae ◽  
Ultrastructural Changes ◽  
Xylem Parenchyma ◽  
Mesophyll Cells ◽  
Fibrillar Material ◽  
Foliar Symptoms ◽  
Leaf Mesophyll ◽  
Before And After ◽  
Cytological Changes ◽  
Verticillium Dahliae Kleb

Ultrastructural changes occurred in chrysanthemum leaves infected by Verticillium dahliae Kleb. before and after the appearance of foliar symptoms. Before visual symptoms appeared, xylem vessels in the leaves contained large amounts of fungus and fibrillar material; by the time wilting occurred many vessels, particularly at the vein ends, were occluded by electron-dense plugs and swollen gelated vessel walls. Some of the chloroplasts in the mesophyll cells had started to degenerate before the first signs of flaccidity were noticeable, but other cytological changes were minimal until chlorosis occurred, at which time the xylem parenchyma had collapsed. Since plugging of leaf vessels preceded wilt and wilt preceded major ultrastructural changes in leaf mesophyll cells, we suggest that plugging of the xylem vessels is the major factor in inducing wilt in Verticillium-infected chrysanthemum.

Ultrastructure and Senescence in an Achloroplastic Mutant of Hordeum vulgare L. cv. Dyan

1992 ◽  
Vol 50 (1) ◽  
pp. 844-845
Author(s):  
R.H.M. Cross ◽  
C.E.J. Botha ◽  
A.K. Cowan ◽  
B.J. Hartley
Keyword(s):  
Cell Wall ◽  
Hordeum Vulgare ◽  
Leaf Tissue ◽  
Ultrastructural Changes ◽  
Hordeum Vulgare L ◽  
Mesophyll Cells ◽  
Lethal Mutant ◽  
Cytoplasmic Matrix ◽  
Close Proximity ◽  
Pinocytotic Vesicles

Senescence is an ordered degenerative process leading to death of individual cells, organs and organisms. The detection of a conditional lethal mutant (achloroplastic) of Hordeum vulgare has enabled us to investigate ultrastructural changes occurring in leaf tissue during foliar senescence.Examination of the tonoplast structure in six and 14 day-old mutant tissue revealed a progressive degeneration and disappearance of the membrane, apparently starting by day six in the vicinity of the mitochondria associated with the degenerating proplastid (Fig. 1.) where neither of the plastid membrane leaflets is evident (arrows, Fig. 1.). At this stage there was evidence that the mitochondrial membranes were undergoing retrogressive changes, coupled with disorganization of cristae (Fig. 2.). Proplastids (P) lack definitive prolamellar bodies. The cytoplasmic matrix is largely agranular, with few endoplasmic reticulum (ER) cisternae or polyribosomal aggregates. Interestingly, large numbers of actively-budding dictysomes, associated with pinocytotic vesicles, were observed in close proximity to the plasmalemma of mesophyll cells (Fig. 3.). By day 14 however, mesophyll cells showed almost complete breakdown of subcellular organelle structure (Fig. 4.), and further evidence for the breakdown of the tonoplast. The final stage of senescence is characterized by the solubilization of the cell wall due to expression and activity of polygalacturonase and/or cellulose. The presence of dictyosomes with associated pinocytotic vesicles formed from the mature face, in close proximity to both the plasmalemma and the cell wall, would appear to support the model proposed by Christopherson for the secretion of cellulase. This pathway of synthesis is typical for secretory glycoproteins.

STRUCTURAL-FUNCTIONAL PECULIARITIES OF LEAF MESOPHYLL CELLS OF TRITICUM AESTIVUM CULTIVARS WITH DIFFERENT COLD/HEAT TOLERANCE UNDER SHORT-TERM TEMPERATURE STRESSES

Tsitologiya ◽  
2018 ◽  
Vol 60 (2) ◽  
pp. 128-135 ◽  
Author(s):  
L. M. Babenko ◽  
◽  
N. N. Scherbatiuk ◽  
D. A. Klimchuk ◽  
I. V. Kosakovskaya ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Heat Tolerance ◽  
Short Term ◽  
Temperature Stresses ◽  
Mesophyll Cells ◽  
Leaf Mesophyll

Water transport in porous hydrogel structures analogous to leaf mesophyll cells

2014 ◽  
Vol 18 (5-6) ◽  
pp. 775-784 ◽  
Author(s):  
Sang Joon Lee ◽  
Hyejeong Kim ◽  
Sungsook Ahn
Keyword(s):  
Water Transport ◽  
Mesophyll Cells ◽  
Leaf Mesophyll ◽  
Porous Hydrogel

Ozone-induced cytochemical and ultrastructural changes in leaf mesophyll cell walls

1997 ◽  
Vol 27 (4) ◽  
pp. 453-463 ◽  
Author(s):  
M S Günthardt-Georg ◽  
C J McQuattie ◽  
C Scheidegger ◽  
C Rhiner ◽  
R Matyssek
Keyword(s):  
Cell Walls ◽  
Mesophyll Cell ◽  
Ultrastructural Changes ◽  
Leaf Mesophyll ◽  
Leaf Mesophyll Cell
Sign in / Sign up

Export Citation Format

Share Document