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Growth-limiting phosphate nutrition suppresses nitrate accumulation in greenhouse lettuce

Growth-limiting phosphate nutrition suppresses nitrate accumulation in greenhouse lettuce Abstract Lettuce was grown in aerated nutrient solutions containing all necessary plant nutrients except phosphate. Phosphate was supplied at four different exponentially increasing rates of daily dosage. In addition, two levels of light and atmospheric CO2 were imposed. The four phosphate addition treatments resulted in different, fairly constant relative growth rates, whereas little effect was observed from light or CO2 levels. Growth reduction associated with limiting phosphate nutrition resulted in increases in root/shoot ratio, dry matter content and concentrations of sugars and organic acids. By contrast, the concentration of nitrate in the shoots was decreased. The concentrations of nitrate and the sum of sugars and organic acids in the shoot showed a strong negative correlation. Two opposing mechanistic models concerning the effects of environmental conditions on nitrate accumulation in plants are discussed in the light of these results. Biomass partitioning, carbohydrate accumulation, growth limitation, Lactuca sativa L., nitrate accumulation, nitrate reduction, nitrate uptake, phosphate deficiency, simulation model, source/sink, turgor This content is only available as a PDF. © Oxford University Press 1999 © Oxford University Press 1999 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Experimental Botany Oxford University Press

Growth-limiting phosphate nutrition suppresses nitrate accumulation in greenhouse lettuce

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References (30)

Publisher
Oxford University Press
Copyright
Copyright © 2022 Society for Experimental Biology
ISSN
0022-0957
eISSN
1460-2431
DOI
10.1093/jxb/50.335.813
Publisher site
See Article on Publisher Site

Abstract

Abstract Lettuce was grown in aerated nutrient solutions containing all necessary plant nutrients except phosphate. Phosphate was supplied at four different exponentially increasing rates of daily dosage. In addition, two levels of light and atmospheric CO2 were imposed. The four phosphate addition treatments resulted in different, fairly constant relative growth rates, whereas little effect was observed from light or CO2 levels. Growth reduction associated with limiting phosphate nutrition resulted in increases in root/shoot ratio, dry matter content and concentrations of sugars and organic acids. By contrast, the concentration of nitrate in the shoots was decreased. The concentrations of nitrate and the sum of sugars and organic acids in the shoot showed a strong negative correlation. Two opposing mechanistic models concerning the effects of environmental conditions on nitrate accumulation in plants are discussed in the light of these results. Biomass partitioning, carbohydrate accumulation, growth limitation, Lactuca sativa L., nitrate accumulation, nitrate reduction, nitrate uptake, phosphate deficiency, simulation model, source/sink, turgor This content is only available as a PDF. © Oxford University Press 1999 © Oxford University Press 1999

Journal

Journal of Experimental BotanyOxford University Press

Published: Jun 1, 1999

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