Abstract
BACKGROUND: Nitrogen (N) plays an important role in the formation of tea quality-related compounds, like amino acids and flavor/aroma origin compounds. Lipids, which have been reported to be affected by N deficiency, are precursors to the generation of flavor/aroma origin compounds in tea plant. However, there is no literature about the lipid profiles of tea plant affected by N fertilization. Hence, we hypothesize that the biosynthesis of flavor-related compounds in tea was affected by N through its regulation of lipid metabolism. RESULTS: In this study, mature leaves and new shoots of tea plant grown under three N levels at the rates of 0, 285 and 474 kg/ha were applied for ultra-performance liquid chromatography-mass spectrometry (UPLC/MS) based lipidomic analysis. Totally, 178 lipid species were identified. The results showed that the composition of lipid compounds in mature leaves and new shoots varied dramatically, which was also affected by N levels. The higher content of the storage lipid TAG and higher carbon (C)/N ratio in mature leaves than that of new shoots in tea plants grown under low N level (0 kg/ha) suggested that tea plants could remobilize the C stored in TAG to maintain their C/N balance and help to improve the quality of tea. N fertilization resulted in a higher content of the compounds 36:6 MGDG and 36:6 DGDG. Since these compounds contain linolenic acid (18:3), a precursor to the formation of aroma origin compounds, we suggested their increase could contribute to the quality of tea. CONCLUSIONS: Taken together, the present work indicated that appropriate application of N fertilizer could balance the lipid metabolism and the formation of flavor/aroma origin compounds, which help to improve the quality of tea. Moreover, excess N fertilization might deteriorate the aroma quality of made tea due to increases of precursors leading to grassy odor.
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Claims 10
Claim · model-written summary
The analysis identified 178 lipid species.
Verbatim
e0“Totally, 178 lipid species were identified.”
t0“tea plant (Camellia sinensis L.)”
Claim · model-written summary
Lipid composition differed strongly between mature leaves and new shoots.
Verbatim
e0“the composition of lipid compounds in mature leaves and new shoots varied dramatically”
t0“tea plant (Camellia sinensis L.)”
Claim · model-written summary
Nitrogen levels affected lipid composition.
Not reportedDirection
Verbatim
e0“the composition of lipid compounds in mature leaves and new shoots varied dramatically, which was also affected by N levels”
t0“tea plant (Camellia sinensis L.)”
Claim · model-written summary
At low N, mature leaves had more TAG than new shoots.
Verbatim
e0“higher content of the storage lipid TAG and higher carbon (C)/N ratio in mature leaves than that of new shoots in tea plants grown under low N level (0 kg/ha)”
Claim · model-written summary
At low N, mature leaves had a higher C/N ratio than new shoots.
Verbatim
e0“higher carbon (C)/N ratio in mature leaves than that of new shoots in tea plants grown under low N level (0 kg/ha)”
Claim · model-written summary
Nitrogen fertilization increased 36:6 MGDG content.
- Taxon
- tea plantt0
- Treatment
- N fertilizatione0
- Outcome
- content of the compounds 36:6 MGDGe0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“N fertilization resulted in a higher content of the compounds 36:6 MGDG and 36:6 DGDG”
t0“tea plant (Camellia sinensis L.)”
Claim · model-written summary
Nitrogen fertilization increased 36:6 DGDG content.
Not reportedComparator
Verbatim
e0“N fertilization resulted in a higher content of the compounds 36:6 MGDG and 36:6 DGDG”
t0“tea plant (Camellia sinensis L.)”
Claim · model-written summary
Authors suggested lipid increases could contribute to tea quality.
Verbatim
e0“we suggested their increase could contribute to the quality of tea”
e1“36:6 MGDG and 36:6 DGDG”
t0“tea plant (Camellia sinensis L.)”
Claim · model-written summary
Appropriate nitrogen application could balance lipid metabolism and aroma precursor formation to improve tea quality.
Verbatim
e0“appropriate application of N fertilizer could balance the lipid metabolism and the formation of flavor/aroma origin compounds, which help to improve the quality of tea”
t0“tea plant (Camellia sinensis L.)”
Claim · model-written summary
Excess N fertilization might deteriorate made-tea aroma through grassy-odor precursors.
Verbatim
e0“excess N fertilization might deteriorate the aroma quality of made tea due to increases of precursors leading to grassy odor”
t0“tea plant (Camellia sinensis L.)”
The same questions in other papers
fertilization · molecular: metabolites · Camellia sinensis (black tea)Positive and negative results
16 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
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See all 18 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.