The effect of osmotic stress on trans-plasma membrane electron transport in plants

Plasma Membrane Redox Enzyme Is Involved in the Synthesis of O2- and H2O2 by Phytophthora Elicitor-Stimulated Rose Cells

“…The effects of these inhibitors on the guaiacol peroxidase activity of rose cell medium were tested becawe peroxidase has been hypothesized to produce O,-in the apoplast (Halliwell, 1978) and at the surface of the plasma membrane (Chalmers et al, 1986). As shown in Table 11, none of Table II the four compounds inhibited the peroxidase activity in the cell-suspension medium except quinacrine, which gave only a 25% inhibition.…”

“…Cell wall peroxidase was suggested by severa1 groups (Elstner and Heupel, 1976;Gross et al, 1977;Halliwell, 1978) to produce 0,-by a complex pathway involving a cycling of apoplastic NADH, NAD, radical, and NADC. More recently it was shown that a plasma membrane peroxidase is responsible for the formation of O, -at the surface of the plasma membrane (Chalmers et al, 1986;Askerlund et al, 1987;Vianello and Macri, 1989). It is possible, even likely, that the cell wall peroxidase and the plasma membrane peroxidase are the same enzyme.…”