6533b7cffe1ef96bd125983e

RESEARCH PRODUCT

A comparison of the effects of ?-ketotriazole, MCPA and carbaryl on the plasma membrane Mg2+-ATPase activity and lipid composition of rice shoots (Oryza sativa)

Raymond S. BurdenRoc RosCaroline S. JamesI. PicazoDavid T. Cooke

subject

Oryza sativabiologyPhysiologyATPasefood and beveragesPlant ScienceMCPASterolchemistry.chemical_compoundchemistryBiochemistryPhosphatidylcholineCarbarylShootbiology.proteinlipids (amino acids peptides and proteins)Composition (visual arts)Agronomy and Crop Science

description

The effect of γ-ketotriazole, MCPA and carbaryl on the lipid composition and ATPase activity associated with plasma membrane fractions from rice (Oryza sativa cv Bahia) shoots was investigated. With γ-ketotriazole and MCPA treatments the relative amount of δ5-avenasterol (%) was reduced in the plasma membrane, whereas with γ-ketotriazole a reduction was also found in the sitosterol content, expressed as a percentage of the total free sterol composition. The fatty acyl chain length of phosphatidylcholine fractions from MCPA-treated plants was also reduced. The plasma membrane Mg2+-ATPase activity was only stimulated in MCPA-treated plants. No changes were observed in lipid composition or ATPase activity with carbaryl treatment.

https://doi.org/10.1007/bf00144584