Abstract
BACKGROUND: Nitrogen (N) fertilizer is commonly considered as one of the most important limiting factors in the agricultural production. As a result, a large amount of N fertilizer is used to improve the yield in modern tea production. Unfortunately, the large amount of N fertilizer input has led to increased plant nitrogen-tolerance and decreased amplitude of yield improvement, which results in significant N loss, energy waste and environment pollution. However, the effects of N-deficiency on the metabolic profiles of tea leaves and roots are not well understood. RESULTS: (N-deficiency) for 4 months by sandy culture. The results suggested that N-deficiency induced tea leaf chlorosis, impaired biomass accumulation, decreased the leaf chlorophyll content and N absorption when they were compared to the Control samples. The untargeted metabolomics based on GC-TOF/MS approach revealed a discrimination of the metabolic profiles between N-deficient tea leaves and roots. The identification and classification of the altered metabolites indicated that N deficiency upregulated the relative abundances of most phenylpropanoids and organic acids, while downregulated the relative abundances of most amino acids in tea leaves. Differentially, N-deficiency induced the accumulation of most carbohydrates, organic acids and amino acids in tea roots. The potential biomarkers screened in N-deficient leaves compared to Control implied that N deficiency might reduce the tea quality. Unlike the N-deficient leaves, the potential biomarkers in N-deficient roots indicated an improved stress response might occur in tea roots. CONCLUSIONS: The results demonstrated N deficiency had different effects on the primary and secondary metabolism in tea leaves and roots. The findings of this study will facilitate a comprehensive understanding of the N-deficient tea plants and provide a valuable reference for the optimized N nutrient management and the sustainable development in the tea plantations.
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Claims 10
Claim · model-written summary
Nitrogen deficiency induced tea leaf chlorosis.
Not reportedDirection
Verbatim
e0“N-deficiency induced tea leaf chlorosis, impaired biomass accumulation, decreased the leaf chlorophyll content and N absorption when they were compared to the Control samples”
t0“tea plants”
Claim · model-written summary
Nitrogen deficiency impaired tea biomass accumulation.
Verbatim
e0“N-deficiency induced tea leaf chlorosis, impaired biomass accumulation, decreased the leaf chlorophyll content and N absorption when they were compared to the Control samples”
t0“tea plants”
Claim · model-written summary
Nitrogen deficiency decreased tea leaf chlorophyll content.
Verbatim
e0“decreased the leaf chlorophyll content and N absorption when they were compared to the Control samples”
t0“nitrogen-deficient leaves and roots of tea plants”
Claim · model-written summary
Nitrogen deficiency decreased tea nitrogen absorption.
Verbatim
e0“decreased the leaf chlorophyll content and N absorption when they were compared to the Control samples”
t0“nitrogen-deficient leaves and roots of tea plants”
Claim · model-written summary
N deficient tea leaves and roots had distinguishable metabolic profiles.
Verbatim
e0“The untargeted metabolomics based on GC-TOF/MS approach revealed a discrimination of the metabolic profiles between N-deficient tea leaves and roots”
t0“tea plants”
Claim · model-written summary
Nitrogen deficiency increased most phenylpropanoids and organic acids in tea leaves.
- Taxon
- tea plantst0
- Organ / stage
- leavest0
- Treatment
- N deficiencye0
- Outcome
- relative abundances of most phenylpropanoids and organic acidse0
- Direction
- upregulatede0
Not reportedComparator
Verbatim
e0“N deficiency upregulated the relative abundances of most phenylpropanoids and organic acids”
t0“leaves and roots of tea plants”
Claim · model-written summary
Nitrogen deficiency decreased most amino acids in tea leaves.
- Taxon
- tea plantst0
- Organ / stage
- tea leavese0
- Treatment
- nitrogen-deficientt0
- Outcome
- relative abundances of most amino acidse0
- Direction
- downregulatede0
Not reportedComparator
Verbatim
e0“downregulated the relative abundances of most amino acids in tea leaves”
t0“nitrogen-deficient leaves and roots of tea plants”
Claim · model-written summary
Nitrogen deficiency accumulated carbohydrates, organic acids and amino acids in tea roots.
- Taxon
- tea plantst0
- Organ / stage
- tea rootse0
- Treatment
- N-deficiencye0
- Outcome
- accumulation of most carbohydrates, organic acids and amino acidse0
- Direction
- accumulatione0
Not reportedComparator
Verbatim
e0“N-deficiency induced the accumulation of most carbohydrates, organic acids and amino acids in tea roots”
t0“tea plants”
Claim · model-written summary
Leaf biomarkers suggested nitrogen deficiency might reduce tea quality.
Verbatim
e0“The potential biomarkers screened in N-deficient leaves compared to Control implied that N deficiency might reduce the tea quality”
t0“tea plants”
Claim · model-written summary
Root biomarkers suggested an improved stress response may occur in tea roots.
Verbatim
e0“the potential biomarkers in N-deficient roots indicated an improved stress response might occur in tea roots”
t0“tea plants”
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