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Effects of the herbicide MCPA, and the heavy metals, cadmium and nickel on the lipid composition, Mg2+-ATPase activity and fluidity of plasma membranes from rice, Oryza sativa (cv. Bahia) shoots


Journal of Experimental Botany 41(225): 457-462
Effects of the herbicide MCPA, and the heavy metals, cadmium and nickel on the lipid composition, Mg2+-ATPase activity and fluidity of plasma membranes from rice, Oryza sativa (cv. Bahia) shoots
Application of the herbicide 4-chloro-2-methylphenoxyacetic acid (MCPA), cadmium or nickel to the roots of rice, Oryza sativa (cv. Bahia) grown in solution culture resulted in changes to the lipid composition and increases in the Mg2+-ATPase activity of the shoot plasma membranes. These increases in Mg2+-ATPase activity were associated with reductions in the campesterol:sitosterol ratio. There was no significant effect on membrane fluidity (measured by steady-state fluorescence polarization) as a result of the treatments. The results suggested that there was no consistent relationship between fluidity and Mg2+-ATPase activity. A possible involvement of sterols in the regulation of plasma membrane-bound ATPase activity is proposed.


Accession: 001820514



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