Work

Energy-linked Sulfate Uptake by Corn Mitochondria via the Phosphate Transporter

Year: 1979

Type: article

Abstract: Corn shoot mitochondria possess an energy-linked transport system for sulfate uptake as demonstrated by osmotic swelling and [(35)S]SO(4) (2-) accumulation. Maximum uptake is secured in the presence of Mg(2+) and oligomycin with sucrose for osmotic support. Neither phosphate nor dicarboxylate anions are required. When added simultaneously, millimolar concentrations of phosphate block [(35)S]SO(4) (2-) uptake after the initial minute. Mersalyl, N-ethylmaleimide, and 2,4-dinitrophenol are strong inhibitors of sulfate uptake; n-butylmalonate is a weak inhibitor. These inhibitors act in the same fashion on phosphate uptake. It is concluded that sulfate uptake in the absence of phosphate is by the phosphate transporter.

Source: PLANT PHYSIOLOGY

DOI: 10.1104/pp.63.4.635

Authors: Samir Abou-Khalil, John B. Hanson

Institutions: University of Illinois Urbana-Champaign, University of Illinois System

Language: English

Topic: Nitrogen and Sulfur Effects on Brassica

Subfield: Agronomy and Crop Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: bronze

Funder: U.S. Department of Energy