In vivo and in vitro effects of cadmium on H+ ATPase activity of plasma membrane vesicles from oat (Avena sativa L.) roots.
The effect of an in vivo and in vitro treatment with cadmium on transport activities of root plasma membrane enriched vesicles was studied in oat (Avena sativa L. cv. Argentina) plants. Addition of 100 mumol/L CdSO4 to nutrient solution decreases both proton transport activity and ATPase activity to the same level. In vitro experiments show that cadmium seems to have a differential inhibiting effect on proton transport activity and ATPase activity, the most pronounced one on ATP-dependent H(+)-accumulation, suggesting that cadmium would interfere with membrane permeability properties. This is indeed the case. The results demonstrate that cadmium decreases passive permeability to protons.
Astolfi
Stefania
S
Dipartimento di Agrobiologia e Agrochimica, Università degli Studi della Tuscia, via S. C. de Lellis, 01100 Viterbo, Italy. sastolfi@unitus.it
Zuchi
Sabrina
S
Chiani
Alessio
A
Passera
Calvino
C
D018554:Avena / Q000187:drug effects* / Q000201:enzymology; D002104:Cadmium / Q000494:pharmacology*; D002462:Cell Membrane / Q000187:drug effects / Q000201:enzymology; D066298:In Vitro Techniques; D018517:Plant Roots / Q000187:drug effects* / Q000201:enzymology; D006180:Proton-Translocating ATPases / Q000378:metabolism*; D011522:Protons
D011522:Protons; D002104:Cadmium; D006180:Proton-Translocating ATPases