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Nitrate concentration effects on NO3-N uptake and reduction, growth, and fruit yield in strawberryStrawberries (Fragaria xananassa Duch. 'Osogrande') were grown hydroponically with three NO3-N concentrations (3.75, 7.5, or 15.0 mM) to determine effects of varying concentration on NO3-N uptake and reduction rates, and to relate these processes to growth and fruit yield. Plants were grown for 32 weeks, and NO3-N uptake and nitrate reductase (NR) activities in roots and shoots were measured during vegetative and reproductive growth. In general, NO3-N uptake rates increased as NO3-N concentration in the hydroponics system increased. Tissue NO3- concentration also increased as external NO3-N concentration increased, reflecting the differences in uptake rates. There was no effect of external NO3-N concentration on NR activities in leaves or roots during either stage of development. Leaf NR activity averaged approximately 360 nmol NO2 formed/g fresh weight (FW)/h over both developmental stages, while NR activity in roots was much lower, averaging approximately 115 nmol NO2 formed/g FW/h. Vegetative organ FW, dry weight (DW), and total fruit yield were unaffected by NO3-N concentration. These data suggest that the inability of strawberry to increase growth and fruit yield in response to increasing NO3-N concentrations is not due to limitations in NO3-N uptake rates, but rather to limitations in NO3- reduction and/or assimilation in both roots and leaves.
Document ID
20040088294
Acquisition Source
Kennedy Space Center
Document Type
Reprint (Version printed in journal)
Authors
Darnell, R. L.
(University of Florida Gainesville, FL 32611-0690, United States)
Stutte, G. W.
Sager, J. C.
Date Acquired
August 21, 2013
Publication Date
September 1, 2001
Publication Information
Publication: Journal of the American Society for Horticultural Science. American Society for Horticultural Science
Volume: 126
Issue: 5
ISSN: 0003-1062
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAS10-12180
Distribution Limits
Public
Copyright
Other
Keywords
NASA Center KSC
NASA Discipline Life Support Systems

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