Application of 28Mg for characterization of Mg uptake in rice seedling under different pH conditions

N. I. Kobayashi, N. Iwata, T. Saito, H. Suzuki, R. Iwata, K. Tanoi, T. M. Nakanishi

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13 Citations (Scopus)

Abstract

The magnesium (Mg) uptake of rice seedlings treated with different pH solutions was investigated using tracer of 28Mg. The application of 28Mg enabled the determination of Mg uptake amount within 15 min of the different pH treatments. The uptake amount of 28Mg and its distribution in rice plants were determined by using the imaging plate. The result demonstrated that the Mg uptake amount was approximately 3 μmol/15 min per plant in 0.27 mM Mg solution at pH 5.6, and this uptake decreased by 30 % at lower pH conditions (pH 4.5). On the contrary, the pH 6.5 condition induced the Mg uptake activity to 4.4 μmol/15 min. The inverse relationship found between proton concentration in nutrient solution and the Mg uptake amount within 15 min of treatment demonstrated that the low pH condition could inhibit the Mg uptake activity as a consequence of the competition between Mg 2+ and proton. It is concluded that under low pH conditions, regardless of other factors, there is a decrease of Mg uptake activity in rice roots.

Original languageEnglish
Pages (from-to)531-534
Number of pages4
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume296
Issue number1
DOIs
Publication statusPublished - 2013 Apr
Externally publishedYes

Keywords

  • Imaging plate
  • Magnesium uptake
  • Mg
  • Rice
  • Tracer experiment
  • pH

ASJC Scopus subject areas

  • Analytical Chemistry
  • Nuclear Energy and Engineering
  • Radiology Nuclear Medicine and imaging
  • Pollution
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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