scholarly journals The effect of intracellular calcium level regulators on the synthesis of pollen tube callose in Oenothera biennis L.

2014 ◽  
Vol 58 (2) ◽  
pp. 199-210 ◽  
Author(s):  
Elżbieta Bednarska

It is shown that callose synthesis in the <em>Oenothera biennis </em>pollen tube is regulated by the endogenous Ca<sup>2+</sup> level. Calcium antagonists reduced the amount of callose in the wall above the tip of the pollen tube (Verapamil - calcium channels blocker) and at the tube tip after stopping tube growth (La<sup>3+</sup> - a Ca<sup>2+</sup> substitute). Ruthenium red and ionophore A 23187, which raise the Ca 21 level in the cytoplasm, induced callose synthesis at the tip of pollen tube.

ORL ◽  
1991 ◽  
Vol 53 (2) ◽  
pp. 78-81 ◽  
Author(s):  
Katsuhisa Ikeda ◽  
Yoshitaka Saito ◽  
Akinori Nishiyama ◽  
Tomonori Takasaka

1988 ◽  
Vol 106 (6) ◽  
pp. 1699-1702
Author(s):  
E. Ya. Pozin ◽  
E. G. Popov ◽  
I. Yu. Gavrilov ◽  
Z. A. Gabbasov ◽  
S. N. Krotov

2010 ◽  
Vol 441 ◽  
pp. 299-305 ◽  
Author(s):  
Matthias Epple ◽  
Anna Kovtun

Calcium phosphate is a natural biomineral and therefore possesses an excellent biocompatibility due to its chemical similarity to human hard tissue (bone and teeth). Calcium phosphate nanoparticles can be precipitated under controlled conditions and used as carrier in biological systems, e.g. to transfer nucleic acids or drugs. Such nanoparticles can also be suitably functionalized with fluorescing dyes, polymeric agents, pro-drugs or activators. The small monodisperse nanoparticles only mildly influence the intracellular calcium level and therefore are not toxic for cells.


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