Ethylene-Induced Increase in Glutamine Synthetase Activity and mRNA Levels in Hevea brasiliensis Latex Cells.
AUTOR(ES)
Pujade-Renaud, V.
RESUMO
Ethylene, used as a stimulant of latex production in Hevea brasiliensis, significantly activates the regenerating metabolism within the laticiferous cells. In this context, attention was focused on glutamine synthetase (GS; EC 6.3.1.2), a key enzyme in nitrogen metabolism. A specific and significant activation of the cytosolic glutamine synthetase (GScyt) in the laticiferous cells after ethylene treatment parallels the increase of latex yield. A marked accumulation of the corresponding mRNA was found, but in contrast, a slight and variable increase of the polypeptide level is at the limit of detection by western blotting. The GS response to ethylene might be mediated by ammonia that increases in latex cytosol following ethylene treatment. The physiological significance for such a regulation by ethylene of the GScyt is discussed in terms of the nitrogen requirement for protein synthesis associated with latex regeneration.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=159337Documentos Relacionados
- Ethylene-induced Rough Endoplasmic Reticula in Abscission Cells
- Ethylene-induced Phenylalanine Ammonia-Lyase Activity in Carrot Roots 12
- Ethylene-induced Fine Structure Alterations in Cotton and Sugarbeet Radicle Cells
- Leaf Age and Ethylene-induced Abscission 1
- Nitrogen source regulates glutamine synthetase mRNA levels in Neurospora crassa.
