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Cyclic variations in nitrogen uptake rate in soybean plants: uptake during reproductive growthNet uptake of NO3- by non-nodulated soybean plants [Glycine max (L.) Merr. cv. Ransom] growing in flowing hydroponic culture was measured daily during a 63 d period of reproductive development between the first florally inductive photoperiod and [unknown word] seed growth. Removal of NO3- from a replenished solution containing 1.0 mol m-3 NO3- was determined by ion chromatography. Uptake of NO3- continued throughout reproductive development. The net uptake rate of NO3- cycled between maxima and minima with a periodicity of oscillation of 3 to 7 d during the floral stage and about 6 d during the fruiting stage. Coupled with increasing concentrations of carbon and C : N ratios in tissues, the oscillations in net uptake rates of NO3- are evidence that the demand for carbohydrate by reproductive organs is contingent on the availability of nitrogen in the shoot pool rather than that the demand for nitrogen follows the flux of carbohydrate into reproductive tissues.
Document ID
20040120336
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Vessey, J. K.
(The University of Manitoba Winnipeg, Canada)
Raper, C. D. Jr
Henry, L. T.
Raper CD, J. r.
Date Acquired
August 22, 2013
Publication Date
December 1, 1990
Publication Information
Publication: Journal of experimental botany
Volume: 41
Issue: 233
ISSN: 0022-0957
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NCC2-101
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Life Support Systems

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