Abstract
A plasma membrane (PM)-associated protoporphyrinogen oxidase (Protox)-like activity has recently been hypothesized to play a critical role in the oxidation of protoporphyrinogen IX exported by Protox-inhibited plastids to protoporphyrin IX in acifluorfen-methyl-treated plant tissues. Protox activities from etioplast and PM fractions from 7-day-old etiolated barley leaves were compared with regard to susceptibility to several Protox-inhibiting herbicides, effects of NADPH, quinones, and chelators, and other biochemical parameters. Etioplast Protox was much more susceptible to the herbicides than was PM Protox, whereas PM activity was much more inhibited by dithiothreitol (DTT)
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