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Plant Physiology 50:485-490 (1972)
© 1972 American Society of Plant Biologists

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Articles

Nitrate Absorption and Assimilation in Ryegrass as Influenced by Calcium and Magnesium 1

M. A. Morgan2, W. A. Jackson and R. J. Volk

a Department of Soil Science, North Carolina State University, Raleigh, North Carolina 27607

The absorption and assimilation patterns of 15NO3– supplied as the Ca2+ and Mg2+ salts to intact ryegrass (Lolium perenne) seedlings were compared. No statistically significant effect of ambient cation on the amounts of 15NO3– absorbed was observed in the initial six hours, but during the subsequent six hours, absorption from Ca(15NO3)2 exceeded that from Mg (15NO3)2.

Lower rates of 15NO3– assimilation were found in roots exposed to Mg(15NO3)2 than in those exposed to Ca(15NO3)2. It was proposed that Mg2+ initiated a restriction in 15NO3– reduction in roots, probably as a consequence of a Mg2+-induced physiological Ca2+ deficiency. Lower 15N translocation rates were also observed from Mg(15NO3)2. These effects of Mg2+ in depressing 15NO3– assimilation and translocation occurred prior to an effect on 15NO3– uptake.

In shoots, larger amounts of reduced 15N products occurred with Ca(15NO3)2 than with Mg(15NO3)2. It was concluded that this was due to enhanced translocation of 15NO3– (and possibly its reduced products) in presence of Ca2+ rather than to specific cation effects on 15NO3– assimilation in the shoots.

2 Present address: Department of Soil Science, Faculty of Agriculture, University College, Glasnevin, Dublin 9, Ireland.

1 Paper No. 3685 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh, North Carolina. These investigations were supported by the United States Atomic Energy Agency, Grant AT(40-1)-2410.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1972 by the American Society of Plant Biologists