1971 Volume 84 Issue 996 Pages 417-423
In segments of etiolated Avena coleoptiles, the dark process of Pfr decay was prevented by several metal-complexing and sulfhydryl compounds, and this inhibition was partly recovered when such metallic ions as ferrous, ferric or zinc ion were given to the tissues. Ferric ion recovered the EDTA- and a, a'-dipyridyl-induced inhibition, but had less effect on the 2-mercaptoethanol-induced one. In contrast, zinc ion recovered the latter as well as the former. The inhibition of dark Pfr decay also occurred in the presence of respiratory inhibitors such as azide, antimycin A and rotenone. The azide-induced inhibition was not recovered by the addition of ferric or zinc ions. Thus, the dark Pfr decay appeared to be controlled at, at least, three different processes in this tissue.