scholarly journals Expression of Sucrose Transporter cDNAs Specifically in Companion Cells Enhances Phloem Loading and Long-Distance Transport of Sucrose but Leads to an Inhibition of Growth and the Perception of a Phosphate Limitation

2014 ◽  
Vol 165 (2) ◽  
pp. 715-731 ◽  
Author(s):  
Kasturi Dasgupta ◽  
Aswad S. Khadilkar ◽  
Ronan Sulpice ◽  
Bikram Pant ◽  
Wolf-Rüdiger Scheible ◽  
...  
Keyword(s):  
Phloem Loading ◽  
Sucrose Transporter ◽  
Phosphate Limitation ◽  
Long Distance ◽  
Long Distance Transport ◽  
Inhibition Of Growth ◽  
Companion Cells ◽  
Distance Transport

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.

scholarly journals Passive phloem loading and long-distance transport in a synthetic tree-on-a-chip

Nature Plants ◽  
2017 ◽  
Vol 3 (4) ◽  
Author(s):  
Jean Comtet ◽  
Kaare H. Jensen ◽  
Robert Turgeon ◽  
Abraham D. Stroock ◽  
A. E. Hosoi
Keyword(s):  
Phloem Loading ◽  
Long Distance ◽  
Long Distance Transport ◽  
Distance Transport

The fine structure of corn phloem

1972 ◽  
Vol 50 (4) ◽  
pp. 839-846 ◽  
Author(s):  
A. P. Singh ◽  
L. M. Srivastava
Keyword(s):  
Fine Structure ◽  
Long Distance ◽  
Sieve Elements ◽  
Long Distance Transport ◽  
P Protein ◽  
Companion Cells ◽  
Parenchyma Cells ◽  
Vascular Parenchyma ◽  
Predominant Orientation ◽  
Distance Transport

The differentiation of sieve elements, companion cells, and vascular parenchyma in leaf bundles of corn is described. The sieve elements have plastids with distinctive crystalline inclusions, lack P-protein, and have nacreous walls in which the predominant orientation of microfibrils seems to be at right angles to the length of the cell. The companion and vascular parenchyma cells have numerous, well-developed mitochondria. These and other results are discussed in relation to long distance transport in the sieve elements.

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