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Plant Physiology 68:605-609 (1981)
© 1981 American Society of Plant Biologists

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

Thomas W. Rufty, Jr., William A. Jackson and C. David Raper, Jr.

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.

1 Paper No. 6710 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, NC.




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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]


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Copyright © 1981 by the American Society of Plant Biologists