Nutrient Uptake Changes in Ascorbate Free Radical-Stimulated Onion Roots

Plant Physiology
José Antonio González-ReyesP Navas

Abstract

Long-term treatments with ascorbate free radical-stimulated glucose, fucose, sucrose, and nitrate uptake in Allium cepa roots. Glucose and fucose showed saturation kinetics in untreated roots, but after treatment with the ascorbate free radical, uptake was linear with time. Although the rates of nitrate and sucrose uptake increased after treatment with ascorbate free radical, the kinetics were similar to those observed in the controls. Ascorbate and dehydroascorbate inhibited nutrient uptake. The uptake rates for all nutrients increased throughout the 48-h period of pretreatment with ascorbate free radical. During the treatment an increase in the vacuole volume and tonoplast surface area also occurred. These results show the relationship between an increase in vacuolar volume and stimulated nutrient uptake from ascorbate-free radical, resulting in enhanced root elongation. These results suggest that activation of a transplasma membrane redox system by ascorbate-free radical is involved in these responses.

Citations

Aug 1, 1994·Journal of Bioenergetics and Biomembranes·F Córdoba, J A González-Reyes
Jun 3, 2004·Proceedings of the National Academy of Sciences of the United States of America·Ryoung Shin, Daniel P Schachtman
Mar 4, 2011·The Journal of Microbiology·Seung-Rock LeeSa-Ouk Kang
Sep 27, 2000·Critical Reviews in Biochemistry and Molecular Biology·N Smirnoff, G L Wheeler
Oct 1, 2008·Journal of Proteome Research·Yi-Wei YangJin-Yuan Liu
Jul 23, 2003·Current Opinion in Plant Biology·Cristina Pignocchi, Christine H Foyer

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