This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Maas, E. V. Articles by Mason, B. J. Search for Related Content PubMed PubMed Citation Articles by Maas, E. V. Articles by Mason, B. J. Agricola Articles by Maas, E. V. Articles by Mason, B. J.

Articles

Manganese Absorption by Excised Barley Roots ¹

Department of Soils, Oregon State University, Corvallis, Oregon 97331

Short-term absorption studies with 5-day-old excised barley roots revealed that the basic aspects of Mn absorption were similar to those of other metabolically absorbed cations. Following an initial non-metabolic equilibration with the root, Mn was absorbed for several hours at a slower steady-state rate comparable to that of other inorganic cations. Complete or nearly complete inhibition of the steady-state phase by low temperature, dinitrophenol, and azide provides strong evidence that Mn transport into this tissue was metabolically mediated. Within limits, the rate of transport was strongly dependent upon the concentrations of Mn and the hydrogen ions in the ambient solution. Absorption increased rapidly with increasing concentrations of Mn up to 1 meq per liter. Above this concentration, the rate leveled off, apparently due to a saturation of the transport mechanism. Within the physiological pH range in which Mn is soluble (below pH 7), absorption increased greatly with decreasing hydrogen-ion concentration.

³ Present address: United States Public Health Service, S. W. Radiological Health Laboratory 4505 Md. Parkway 00, Las Vegas, Nevada 89101.

¹ This technical paper No. 2360 of the Oregon Agricultural Experimental Station is based on work performed under contract No. AT (45-1)-1547) with the United States Atomic Energy Commission.

This article has been cited by other articles:

				E. Diatloff, F. W. Smith, and C. J. Asher Effects of Lanthanum and Cerium on the Growth and Mineral Nutrition of Corn and Mungbean Ann. Bot., May 1, 2008; 101(7): 971 - 982. [Abstract] [Full Text] [PDF]

				W. J. Kogelmann and W. E. Sharpe Soil Acidity and Manganese in Declining and Nondeclining Sugar Maple Stands in Pennsylvania J. Environ. Qual., February 2, 2006; 35(2): 433 - 441. [Abstract] [Full Text] [PDF]

				P. Pedas, C. A. Hebbern, J. K. Schjoerring, P. E. Holm, and S. Husted Differential Capacity for High-Affinity Manganese Uptake Contributes to Differences between Barley Genotypes in Tolerance to Low Manganese Availability Plant Physiology, November 1, 2005; 139(3): 1411 - 1420. [Abstract] [Full Text] [PDF]