scholarly journals Observations on the Feeding of the Virus Vector Orosi Us Argent Atus (Evans), and Comparisons With Certain Other Jassids

1952 ◽  
Vol 5 (1) ◽  
pp. 128 ◽  
Author(s):  
MF Day ◽  
H Irzykiewicz ◽  
Anne Mckinnon
Keyword(s):  
Feeding Behaviour ◽  
Virus Vector ◽  
Ph Gradient ◽  
Vascular Bundles ◽  
Phloem Tissue

Examination of feeding tracks of several species of jassids in plant petioles shows that each species produces characteristic stylet sheaths. Most species feed in both parenchyma and vascular bundles and they exhibit varying degrees of preference for phloem tissue. An attempt to confirm published observations on a pH gradient towards the phloem failed to reveal such a gradient in many of the plants examined; in fact, it has been demonstrated that no such gradient is required to explain the feeding behaviour of the jassids studied. It is concluded that they find .the tissues upon which they feed by random probing with the stylets.

scholarly journals Physiological and Anatomical Mechanisms in Wheat to Cope with Salt Stress Induced by Seawater

Plants ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 237 ◽  
Author(s):  
Rania M. A. Nassar ◽  
Hedaya A. Kamel ◽  
Ahmed E. Ghoniem ◽  
Juan José Alarcón ◽  
Agnieszka Sekara ◽  
...  
Keyword(s):  
Salt Stress ◽  
Dry Weight ◽  
Triticum Aestivum L ◽  
Vascular Bundles ◽  
Phloem Tissue ◽  
Total Leaf Area ◽  
Saline Environment ◽  
Feature Change ◽  
Total Dry Weight ◽  
Very High

Two pot experiments were conducted in a greenhouse to examine 14C fixation and its distribution in biochemical leaf components, as well as the physiological and anatomical adaptability responses of wheat (Triticum aestivum L.) grown with seawater diluted to 0.2, 3.0, 6.0, and 12.0 dS m−1. The results showed significant reductions in chlorophyll content, 14C fixation (photosynthesis), plant height, main stem diameter, total leaf area per plant, and total dry weight at 3.0, 6.0, and 12.0 dS m−1 seawater salt stress. The 14C loss was very high at 12.0 ds m−1 after 120 h. 14C in lipids (ether extract) showed significant changes at 12.0 dS m−1 at 96 and 120 h. The findings indicated the leaf and stem anatomical feature change of wheat plants resulting from adaptation to salinity stress. A reduction in the anatomical traits of stem and leaf diameter, wall thickness, diameter of the hollow pith cavity, total number of vascular bundles, number of large and small vascular bundles, bundle length and width, thickness of phloem tissue, and diameter of the metaxylem vessel of wheat plants was found. In conclusion, salt stress induces both anatomical and physiological changes in the stem and leaf cells of wheat, as well as the tissues and organs, and these changes in turn make it possible for the plants to adapt successfully to a saline environment.

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)

The Fine Structure of Phloem Cells

1985 ◽  
Vol 43 ◽  
pp. 632-635
Author(s):  
James Cronshaw
Keyword(s):  
Structural Studies ◽  
High Concentration ◽  
Long Distance ◽  
Phloem Tissue ◽  
Sieve Elements ◽  
Long Distance Transport ◽  
P Protein ◽  
Companion Cells ◽  
Electron Microscopical ◽  
Distance Transport

Long distance transport in plants takes place in phloem tissue which has characteristic cells, the sieve elements. At maturity these cells have sieve areas in their end walls with specialized perforations. They are associated with companion cells, parenchyma cells, and in some species, with transfer cells. The protoplast of the functioning sieve element contains a high concentration of sugar, and consequently a high hydrostatic pressure, which makes it extremely difficult to fix mature sieve elements for electron microscopical observation without the formation of surge artifacts. Despite many structural studies which have attempted to prevent surge artifacts, several features of mature sieve elements, such as the distribution of P-protein and the nature of the contents of the sieve area pores, remain controversial.

Elemental Analysis of Phloem Tissue in Lemna Minor Root Tips

1980 ◽  
Vol 38 ◽  
pp. 798-799
Author(s):  
Patrick Echlin ◽  
Thomas Hayes ◽  
Clifford Lai ◽  
Greg Hook
Keyword(s):  
Vascular Tissue ◽  
Lemna Minor ◽  
Atomic Weight ◽  
Companion Cell ◽  
Root Tips ◽  
Phloem Tissue ◽  
Cell Stage ◽  
Phloem Parenchyma ◽  
Parenchyma Cells ◽  
Xylem Element

Studies (1—4) have shown that it is possible to distinguish different stages of phloem tissue differentiation in the developing roots of Lemna minor by examination in the transmission, scanning, and optical microscopes. A disorganized meristem, immediately behind the root-cap, gives rise to the vascular tissue, which consists of single central xylem element surrounded by a ring of phloem parenchyma cells. This ring of cells is first seen at the 4-5 cell stage, but increases to as many as 11 cells by repeated radial anticlinal divisions. At some point, usually at or shortly after the 8 cell stage, two phloem parenchyma cells located opposite each other on the ring of cells, undergo an unsynchronized, periclinal division to give rise to the sieve element and companion cell. Because of the limited number of cells involved, this developmental sequence offers a relatively simple system in which some of the factors underlying cell division and differentiation may be investigated, including the distribution of diffusible low atomic weight elements within individual cells of the phloem tissue.

Monitoring feeding behaviour of brent geese Branta bernicla using position-sensitive radio transmitters

2001 ◽  
Vol 7 (1) ◽  
pp. 77-86 ◽  
Author(s):  
Mark Hassall ◽  
Simon J. Lane ◽  
Martin Stock ◽  
Steve M. Percival ◽  
Barbara Pohl
Keyword(s):  
Feeding Behaviour ◽  
Branta Bernicla ◽  
Radio Transmitters ◽  
Position Sensitive
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