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Differences in uptake kinetics of ammonium and nitrate in legumes and cereals

THEERTHAM P. RAO, OSAMU ITO and RYOUICHI MATSUNGA
Plant and Soil
Vol. 154, No. 1, Selected papers from the PROCEEDINGS OF THE EIGHTH INTERNATIONAL COLLOQUIUM FOR THE OPTIMIZATION OF PLANT NUTRITION (July (I) 1993), pp. 67-72
Published by: Springer
Stable URL: http://www.jstor.org/stable/42939001
Page Count: 6
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Differences in uptake kinetics of ammonium and nitrate in legumes and cereals
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Abstract

Influx isotherms were obtained for nitrate and ammonium from three legumes, Cajanus cajan (L.) Millsp., Cicer arietinum L. and Arachis hypogaea L. and three cereals, Sorghum bicolor (L.) Moench., Pennisetum glaucum L. and Zea mays L. The transition in influx isotherms for both nitrogen sources was found to be within the concentration range (0.05-2.5 mM) tested. There were significant differences in Km and Vmax for ammonium between legumes and cereals. The difference in the kinetic properties for nitrate uptake between the two groups of plants only became apparent at the higher concentration tested. Legumes translocated absorbed nitrate and ammonium to shoots more rapidly than cereals. Results show that there are significant differences in uptake and translocation of ammonium and nitrate between legumes and cereals.

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