Rate of change of composition of lettuce in response to nitrogen depletion or re-supply

BACKGROUND: Lettuce accumulates high levels of nitrate when grown in winter in heated greenhouses. Temporarily removing nitrate from the nutrient solution may lower tissue nitrate. The composition of hydroponic lettuce was examined over a 6‐ to 13‐day interval of nitrogen depletion or re‐supply. RES...

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Published in:Journal of the science of food and agriculture Vol. 92; no. 15; pp. 3007 - 3015
Main Author: Gent, Martin P N
Format: Journal Article
Language:English
Published: Chichester, UK John Wiley & Sons, Ltd 01-12-2012
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Abstract BACKGROUND: Lettuce accumulates high levels of nitrate when grown in winter in heated greenhouses. Temporarily removing nitrate from the nutrient solution may lower tissue nitrate. The composition of hydroponic lettuce was examined over a 6‐ to 13‐day interval of nitrogen depletion or re‐supply. RESULTS: Growth responses were delayed by 6 days or more after changing N supply, except root growth responded in 3–4 days. The total nitrogen increased or decreased for 6 days. When measured in the light, nitrate concentration changed 10‐fold in roots within 2 days. The change in leaf and petiole tissue was slower. Amino acids responded to a change in N‐supply within 1 day in leaf and root. All tissues of N‐depleted plants had more sugars compared to N‐sufficient plants within 2 days after the start of depletion. Nitrogen depletion had reversible effects on growth or tissue concentrations if applied for only 6 days. CONCLUSIONS: Tissue nitrate changed more rapidly than total nitrogen, or growth responses. However, nitrate changed more slowly in petiole than in leaf blade or roots, and larger plants have more biomass in petioles. Thus, clearing nitrate from lettuce is slower for large compared to smaller lettuce plants. Copyright © 2012 Society of Chemical Industry
AbstractList BACKGROUNDLettuce accumulates high levels of nitrate when grown in winter in heated greenhouses. Temporarily removing nitrate from the nutrient solution may lower tissue nitrate. The composition of hydroponic lettuce was examined over a 6- to 13-day interval of nitrogen depletion or re-supply.RESULTSGrowth responses were delayed by 6 days or more after changing N supply, except root growth responded in 3-4 days. The total nitrogen increased or decreased for 6 days. When measured in the light, nitrate concentration changed 10-fold in roots within 2 days. The change in leaf and petiole tissue was slower. Amino acids responded to a change in N-supply within 1 day in leaf and root. All tissues of N-depleted plants had more sugars compared to N-sufficient plants within 2 days after the start of depletion. Nitrogen depletion had reversible effects on growth or tissue concentrations if applied for only 6 days.CONCLUSIONSTissue nitrate changed more rapidly than total nitrogen, or growth responses. However, nitrate changed more slowly in petiole than in leaf blade or roots, and larger plants have more biomass in petioles. Thus, clearing nitrate from lettuce is slower for large compared to smaller lettuce plants.
Lettuce accumulates high levels of nitrate when grown in winter in heated greenhouses. Temporarily removing nitrate from the nutrient solution may lower tissue nitrate. The composition of hydroponic lettuce was examined over a 6- to 13-day interval of nitrogen depletion or re-supply. Growth responses were delayed by 6 days or more after changing N supply, except root growth responded in 3-4 days. The total nitrogen increased or decreased for 6 days. When measured in the light, nitrate concentration changed 10-fold in roots within 2 days. The change in leaf and petiole tissue was slower. Amino acids responded to a change in N-supply within 1 day in leaf and root. All tissues of N-depleted plants had more sugars compared to N-sufficient plants within 2 days after the start of depletion. Nitrogen depletion had reversible effects on growth or tissue concentrations if applied for only 6 days. Tissue nitrate changed more rapidly than total nitrogen, or growth responses. However, nitrate changed more slowly in petiole than in leaf blade or roots, and larger plants have more biomass in petioles. Thus, clearing nitrate from lettuce is slower for large compared to smaller lettuce plants.
Lettuce accumulates high levels of nitrate when grown in winter in heated greenhouses. Temporarily removing nitrate from the nutrient solution may lower tissue nitrate. The composition of hydroponic lettuce was examined over a 6- to 13-day interval of nitrogen depletion or re-supply. Growth responses were delayed by 6 days or more after changing N supply, except root growth responded in 3-4 days. The total nitrogen increased or decreased for 6 days. When measured in the light, nitrate concentration changed 10-fold in roots within 2 days. The change in leaf and petiole tissue was slower. Amino acids responded to a change in N-supply within 1 day in leaf and root. All tissues of N-depleted plants had more sugars compared to N-sufficient plants within 2 days after the start of depletion. Nitrogen depletion had reversible effects on growth or tissue concentrations if applied for only 6 days. Tissue nitrate changed more rapidly than total nitrogen, or growth responses. However, nitrate changed more slowly in petiole than in leaf blade or roots, and larger plants have more biomass in petioles. Thus, clearing nitrate from lettuce is slower for large compared to smaller lettuce plants.
BACKGROUND: Lettuce accumulates high levels of nitrate when grown in winter in heated greenhouses. Temporarily removing nitrate from the nutrient solution may lower tissue nitrate. The composition of hydroponic lettuce was examined over a 6‐ to 13‐day interval of nitrogen depletion or re‐supply. RESULTS: Growth responses were delayed by 6 days or more after changing N supply, except root growth responded in 3–4 days. The total nitrogen increased or decreased for 6 days. When measured in the light, nitrate concentration changed 10‐fold in roots within 2 days. The change in leaf and petiole tissue was slower. Amino acids responded to a change in N‐supply within 1 day in leaf and root. All tissues of N‐depleted plants had more sugars compared to N‐sufficient plants within 2 days after the start of depletion. Nitrogen depletion had reversible effects on growth or tissue concentrations if applied for only 6 days. CONCLUSIONS: Tissue nitrate changed more rapidly than total nitrogen, or growth responses. However, nitrate changed more slowly in petiole than in leaf blade or roots, and larger plants have more biomass in petioles. Thus, clearing nitrate from lettuce is slower for large compared to smaller lettuce plants. Copyright © 2012 Society of Chemical Industry
BACKGROUND: Lettuce accumulates high levels of nitrate when grown in winter in heated greenhouses. Temporarily removing nitrate from the nutrient solution may lower tissue nitrate. The composition of hydroponic lettuce was examined over a 6‐ to 13‐day interval of nitrogen depletion or re‐supply. RESULTS: Growth responses were delayed by 6 days or more after changing N supply, except root growth responded in 3–4 days. The total nitrogen increased or decreased for 6 days. When measured in the light, nitrate concentration changed 10‐fold in roots within 2 days. The change in leaf and petiole tissue was slower. Amino acids responded to a change in N‐supply within 1 day in leaf and root. All tissues of N‐depleted plants had more sugars compared to N‐sufficient plants within 2 days after the start of depletion. Nitrogen depletion had reversible effects on growth or tissue concentrations if applied for only 6 days. CONCLUSIONS: Tissue nitrate changed more rapidly than total nitrogen, or growth responses. However, nitrate changed more slowly in petiole than in leaf blade or roots, and larger plants have more biomass in petioles. Thus, clearing nitrate from lettuce is slower for large compared to smaller lettuce plants. Copyright © 2012 Society of Chemical Industry
Author Gent, Martin P N
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  organization: Dept of Forestry and Horticulture, Connecticut Agricultural Experiment Station, PO Box 1106, New Haven, CT 06504 USA
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Issue 15
Keywords Vegetables
sugars
Root
Growth
Rate
amino acids
Supply
Dry matter
Plant leaf
Nitrates
nitrate
Nitrogen
leaf blade
reduced nitrogen
Lettuce
Plant part
Malic acid
petiole
Sugar
Language English
License CC BY 4.0
Copyright © 2012 Society of Chemical Industry.
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Demsar J (e_1_2_5_6_2) 2004; 129
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Snippet BACKGROUND: Lettuce accumulates high levels of nitrate when grown in winter in heated greenhouses. Temporarily removing nitrate from the nutrient solution may...
Lettuce accumulates high levels of nitrate when grown in winter in heated greenhouses. Temporarily removing nitrate from the nutrient solution may lower tissue...
BACKGROUND: Lettuce accumulates high levels of nitrate when grown in winter in heated greenhouses. Temporarily removing nitrate from the nutrient solution may...
BACKGROUNDLettuce accumulates high levels of nitrate when grown in winter in heated greenhouses. Temporarily removing nitrate from the nutrient solution may...
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pascalfrancis
wiley
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StartPage 3007
SubjectTerms Amino acids
Amino Acids - analysis
Biological and medical sciences
Biomass
dry matter
Food industries
Fruit and vegetable industries
Fundamental and applied biological sciences. Psychology
Greenhouses
growth
Hydroponics
Kinetics
Lactuca - chemistry
Lactuca - drug effects
Lactuca - growth & development
leaf blade
Lettuce
malic acid
nitrate
Nitrates - administration & dosage
Nitrates - analysis
Nitrogen
Nitrogen - administration & dosage
petiole
Plant growth
Plant Leaves - chemistry
Plant Leaves - drug effects
Plant Leaves - growth & development
Plant Roots - chemistry
Plant Roots - drug effects
Plant Roots - growth & development
reduced nitrogen
root
sugars
Title Rate of change of composition of lettuce in response to nitrogen depletion or re-supply
URI https://api.istex.fr/ark:/67375/WNG-3M38VPN9-X/fulltext.pdf
https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fjsfa.5716
https://www.ncbi.nlm.nih.gov/pubmed/22576671
https://www.proquest.com/docview/1114027857
https://search.proquest.com/docview/1237084706
Volume 92
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