Symplasmic connections between sieve element and companion cell in the stem phloem ofVicia faba L. have a molecular exclusion limit of at least 10 kDa

Planta ◽  
1997 ◽  
Vol 201 (2) ◽  
pp. 195-201 ◽  
Author(s):  
Ronald Kempers ◽  
Aart J. E. van Bel
Keyword(s):  
Sieve Element ◽  
Companion Cell ◽  
Exclusion Limit ◽  
Ofvicia Faba

Plasma membrane localization of the type I H+-PPase AVP1 in sieve element–companion cell complexes from Arabidopsis thaliana

Plant Science ◽  
2011 ◽  
Vol 181 (1) ◽  
pp. 23-30 ◽  
Author(s):  
Julio Paez-Valencia ◽  
Araceli Patron-Soberano ◽  
Alejandra Rodriguez-Leviz ◽  
Jonathan Sanchez-Lares ◽  
Concepcion Sanchez-Gomez ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Plasma Membrane ◽  
Sieve Element ◽  
Membrane Localization ◽  
Type I ◽  
Companion Cell ◽  
Cell Complexes ◽  
Plasma Membrane Localization

scholarly journals Evidence for functional heterogeneity of sieve element–companion cell complexes in minor vein phloem of Alonsoa meridionalis

2009 ◽  
Vol 60 (6) ◽  
pp. 1873-1883 ◽  
Author(s):  
Olga V. Voitsekhovskaja ◽  
Elena L. Rudashevskaya ◽  
Kirill N. Demchenko ◽  
Marina V. Pakhomova ◽  
Denis R. Batashev ◽  
...  
Keyword(s):  
Sieve Element ◽  
Functional Heterogeneity ◽  
Companion Cell ◽  
Cell Complexes ◽  
Minor Vein

scholarly journals Differential Distribution of Proteins Expressed in Companion Cells in the Sieve Element-Companion Cell Complex of Rice Plants

2005 ◽  
Vol 46 (11) ◽  
pp. 1779-1786 ◽  
Author(s):  
Akari Fukuda ◽  
Syu Fujimaki ◽  
Tomoko Mori ◽  
Nobuo Suzui ◽  
Keiki Ishiyama ◽  
...  
Keyword(s):  
Sieve Element ◽  
Cell Complex ◽  
Companion Cell ◽  
Differential Distribution ◽  
Rice Plants ◽  
Companion Cells

Immunolocalization of plasma-membrane H + -ATPase and tonoplast-type pyrophosphatase in the plasma membrane of the sieve element-companion cell complex in the stem of Ricinus communis L.

Planta ◽  
2001 ◽  
Vol 213 (1) ◽  
pp. 11-19 ◽  
Author(s):  
Markus Langhans ◽  
Rafael Ratajczak ◽  
Martin Lützelschwab ◽  
Wolfgang Michalke ◽  
Rebecca Wächter ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Ricinus Communis ◽  
Sieve Element ◽  
Cell Complex ◽  
Companion Cell ◽  
Ricinus Communis L

Ontogeny of cambium and Phloem in the Epicotyl of Pisum sativum

1968 ◽  
Vol 16 (3) ◽  
pp. 419 ◽  
Author(s):  
S Zee
Keyword(s):  
General Pattern ◽  
Transitional Cell ◽  
Parenchyma Cell ◽  
Sieve Element ◽  
Companion Cell ◽  
Secondary Phloem ◽  
Initial Cell ◽  
Phloem Parenchyma ◽  
Sieve Cell ◽  
Phloem Parenchyma Cell

The pattern of distribution and differentiation of the primary phloem, the cambium, and the secondary phloem, and the exact pattern of division of the initial cell and its derivatives have been studied in the epicotyl of pea plants by using electron microscopy. Three divisional patterns of the initial cell, in giving rise to the phloem cells, are recognized. The initial cell first divides periclinally to give rise to a transitional cell. This transitional cell then divides further (periclinally and/or anticlinally) to give rise to three sequences of phloem derivatives: (1) phloem parenchyma cells, (2) a companion cell and a sieve cell, and (3) a companion cell, a sieve cell, and a phloem parenchyma cell. The derived cells can all easily be distinguished from each other either by their position in the vascular bundle at low magnification or by the different types of plastids present in them. The general pattern of differentiation of the cytoplasm and the formation of the sieve plate and the sieve pores of the sieve element are essentially similar in the primary and the secondary phloem. However, the sieve element of the secondary phloem, unlike that of the primary phloem, possesses in its cytoplasm three kinds of inclusion bodies - an amorphous form, a "crystalline" form, and a tubular form; these are described and their nature discussed.

Microtubules and root protophloem ontogeny in wheat

1985 ◽  
Vol 75 (1) ◽  
pp. 165-179
Author(s):  
E.P. Eleftheriou
Keyword(s):  
Cell Plate ◽  
Sieve Element ◽  
Companion Cell ◽  
Cortical Zone ◽  
Companion Cells ◽  
Asymmetrical Division ◽  
Single Precursor ◽  
Position And Orientation ◽  
Asymmetrical Divisions

Protophloem ontogeny in roots of Triticum aestivum has been investigated ultrastructurally. Each protophloem pole consists of three cells, a protophloem sieve element and two companion cells, all originating from a single precursor cell usually having a pentahedral shape. This protophloem mother cell (PMC) undergoes two successive asymmetrical divisions: the first one gives rise to a smaller cell that will differentiate into a companion cell, and a larger one that divides again asymmetrically yielding another companion cell and a protophloem sieve element. The latter divides once more, but now symmetrically, increasing the number of cells. Both asymmetrical and symmetrical divisions are preceded by preprophase microtubule bands (PMBs), well demarcated by a great number (more than 100 profiles in a single band section) of microtubules (MTs). The plane of a PMB coincides with that of the succeeding cell plate, which fuses with parent walls at sites previously occupied by the PMB. The strict correspondence between PMB and cell plate suggests that a cytokinesis the latter bisects the PMB cortical zone. The possible role of PMB cortical zone in positioning the cell plate and guiding its expanding edges towards predetermined sites is discussed in relation to recent discoveries in other anatomical situations. The plane of PMBs (and hence of divisions) changes from one division to the next, so that the three successive divisions occur in three spatial planes transversely to each other. This change is probably influenced by cell polarity. Prior to each asymmetrical division peri-nuclear MTs were observed besides the MTs of the PMB. They appear before the PMB organization and persist throughout preprophase, but they change their position and orientation in response to the transition from PMB to the spindle organization.

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