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 Web of Science 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 Web of Science (53) Citing Articles via Google Scholar Google Scholar Articles by Rufty, T. W. Articles by Raper, C. D. Search for Related Content PubMed PubMed Citation Articles by Rufty, T. W., Jr. Articles by Raper, C. D., Jr. Agricola Articles by Rufty, T. W. Articles by Raper, C. D.

Articles

Nitrate Reduction in Roots as Affected by the Presence of Potassium and by Flux of Nitrate through the Roots ¹

Department of Soil Science, North Carolina State University, Raleigh, North Carolina 27650

Dark-grown, detopped corn seedlings (cv. Pioneer 3369A) were exposed to treatment solutions containing Ca(NO₃)₂, NaNO₃, or KNO₃; KNO₃ plus 50 or 100 millimolar sorbitol; and KNO₃ at root temperatures of 30, 22, or 16 C. In all experiments, the accelerated phase of NO₃^– transport had previously been induced by prior exposure to NO₃^– for 10 hours. The experimental system allowed direct measurements of net NO₃^– uptake and translocation, and calculation of NO₃^– reduction in the root. The presence of K⁺ resulted in small increases in NO₃^– uptake, but appreciably stimulated NO₃^– translocation out of the root. Enhanced translocation was associated with a marked decrease in the proportion of absorbed NO₃^– that was reduced in the root. When translocation was slowed by osmoticum or by low root temperatures, a greater proportion of absorbed NO₃^– was reduced in the presence of K⁺. Results support the proposition that NO₃^– reduction in the root is reciprocally related to the rate of NO₃^– transport through the root symplasm.

This article has been cited by other articles:

				P. Armengaud, R. Sulpice, A. J. Miller, M. Stitt, A. Amtmann, and Y. Gibon Multilevel Analysis of Primary Metabolism Provides New Insights into the Role of Potassium Nutrition for Glycolysis and Nitrogen Assimilation in Arabidopsis Roots Plant Physiology, June 1, 2009; 150(2): 772 - 785. [Abstract] [Full Text] [PDF]

				A. D. Peuke, W. D. Jeschke, and W. Hartung Flows of elements, ions and abscisic acid in Ricinus communis and site of nitrate reduction under potassium limitation J. Exp. Bot., February 1, 2002; 53(367): 241 - 250. [Abstract] [Full Text] [PDF]