Division of Biology, Faculty of Science, University of Zagreb
Abstract
Isolated pea chloroplasts were treated with secondary metabolites acetylcholine, dopamine, adrenaline, noradrenaline, serotonin known as animal neurotransmitters or mediators and found in plant cell as well. There were no effects of all compounds on the NADP-photoreduction. Low concentrations (< 10-5 M)) of these, except serotonin, stimulated noncyclic photophosphorylation in thylakoids. Acetylcholine induced Na+, K+ output from intact chloroplasts, but had no effect on Ca2+, Mg2+ efflux. Dopamine, adrenaline, noradrenaline and serotonin had an opposite effect. A possible regulatory and mediatory role of the substances in chloroplasts and in cell is discussed.Izolirani kloroplasti tretirani su sekundarnim metabolitima acetilholinom, dopaminom, adrenalinom, noradrenalinom i serotoninom, koji su prisutni u biljnim stanicama. U životinja također dolaze ovi spojevi i imaju ulogu neurotransmitera ili medijatora. Svi osim serotonina u niskim koncentracijama (10-5 M) potiču necikličku fotofosforilaciju u tilakoidama. Acetilholin pospješuje izlaženje K‘ i Na+ ijona iz intaktnih kloro- plasta, ali ne utječe tako i na Ca2" i Ma2". Dopamin, adrenalin, noradrenalin i serotonin imaju suprotan učinak