Plant and Soil

, Volume 280, Issue 1, pp 223–228

Active Silicon Uptake by Wheat

  • D. W. Rains
  • E. Epstein
  • R. J. Zasoski
  • M. Aslam
Article

DOI: 10.1007/s11104-005-3082-x

Cite this article as:
Rains, D.W., Epstein, E., Zasoski, R.J. et al. Plant Soil (2006) 280: 223. doi:10.1007/s11104-005-3082-x

Abstract

The absorption of Si by wheat, Triticum aestivum L. ‘Yecora Rojo,’ followed Michaelis–Menten kinetics over a concentration range of 0.004–1.0 mM. Km and Vmax were determined using linear transformations and the calculated curve fitted the data closely. The absorption resulted in accumulation ratios of 200/1 or more. In keeping with that finding, this study also demonstrated that Si uptake by wheat is under metabolic control, being severely restricted by dinitrophenol (DNP) and potassium cyanide (KCN). Silicon uptake by wheat was not significantly affected by phosphate ions, but the chemical analog Ge exerted a direct competitive effect on Si uptake, and vice versa.

Keywords

kinetics silicon uptake wheat 

Copyright information

© Springer 2006

Authors and Affiliations

  • D. W. Rains
    • 1
  • E. Epstein
    • 2
  • R. J. Zasoski
    • 2
  • M. Aslam
    • 1
  1. 1.Department of Plant SciencesUniversity of CaliforniaDavisUSA
  2. 2.Department of Land, Air and Water Resources – Soils and BiogeochemistryUniversity of CaliforniaDavisUSA

Personalised recommendations