Abstract
UV can serve as an effective light spectrum for regulating plant secondary metabolites, while relevant studies on UV-A are much less extensive than those on UV-B. A comprehensive understanding of the selective effects of UV-A on different secondary metabolites and the specific features of primary metabolism that drive these effects is still lacking. To address this knowledge gap, we conducted a study to analyze the dynamic changes in the metabolome and transcriptome of lettuce leaves irradiated with red plus UV-A light (monochromatic red light as control). Generally, UV-A promoted the synthesis of most phenylpropanoids and terpenoids originating from the shikimate and methylerythritol phosphate (MEP) pathway in plastids but sacrificed the synthesis of terpenoids derived from the mevalonate (MVA) pathway, particularly sesquiterpenes. Increased precursors supply for the shikimate and MEP pathway under UV-A was directly supported by the activation of the Calvin-Benson cycle and phosphoenolpyruvate transport. Whereas, along with phosphoenolpyruvate transport, the TCA cycle was restrained, causing deprivation of the MVA pathway precursor. In addition, UV-A also activated the plastidic oxidative branch of the pentose phosphate pathway, photorespiration, and malate shuttle, to ensure a sufficient supply of nitrogen, circulation homeostasis of the Calvin-Benson cycle, and energy balance, thus indirectly supporting UV-A-induced specific secondary metabolic output. This study provides a comprehensive framework for understanding the flexible primary-secondary metabolism interactions that are able to produce specific metabolites favorable for adaptation to environmental stimuli.
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Claims 5
Claim · model-written summary
UV-A promoted synthesis of most phenylpropanoids and terpenoids from the shikimate and MEP pathways.
- Taxon
- Lettuce (Lactuca sativa)
Lactuca sativat0 - Treatment
- UV-Ae0
- Outcome
- synthesis of most phenylpropanoids and terpenoidse0
- Direction
- promotede0
- Comparator
- monochromatic red lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa)”
e0“UV-A promoted the synthesis of most phenylpropanoids and terpenoids originating from the shikimate and methylerythritol phosphate (MEP) pathway in plastids”
e1“monochromatic red light as control”
Claim · model-written summary
UV-A reduced synthesis of MVA-derived terpenoids, especially sesquiterpenes.
- Taxon
- Lettuce (Lactuca sativa)Lactuca sativat0
- Treatment
- UV-Ae1
- Outcome
- synthesis of terpenoids derived from the mevalonate (MVA) pathway, particularly sesquiterpenese0
- Direction
- sacrificede0
- Comparator
- monochromatic red lighte2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa)”
e0“sacrificed the synthesis of terpenoids derived from the mevalonate (MVA) pathway, particularly sesquiterpenes”
e1“Generally, UV-A promoted”
e2“monochromatic red light as control”
Claim · model-written summary
Increased precursor supply for shikimate and MEP pathways under UV-A was supported by Calvin-Benson cycle activation and phosphoenolpyruvate transport.
- Taxon
- Lettuce (Lactuca sativa)Lactuca sativat0
- Outcome
- precursors supply for the shikimate and MEP pathwaye0
- Direction
- Increasede0
- Qualifier
- activation of the Calvin-Benson cycle and phosphoenolpyruvate transporte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa)”
e0“Increased precursors supply for the shikimate and MEP pathway under UV-A was directly supported by the activation of the Calvin-Benson cycle and phosphoenolpyruvate transport”
Claim · model-written summary
UV-A restrained the TCA cycle, depriving the MVA pathway of precursor.
- Taxon
- Lettuce (Lactuca sativa)Lactuca sativat0
- Treatment
- UV-Ae1
- Outcome
- deprivation of the MVA pathway precursore0
- Qualifier
- TCA cycle was restrainede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa)”
e0“the TCA cycle was restrained, causing deprivation of the MVA pathway precursor”
e1“under UV-A”
Claim · model-written summary
UV-A activated the plastidic oxidative pentose phosphate pathway, photorespiration and malate shuttle.
- Taxon
- Lettuce (Lactuca sativa)Lactuca sativat0
- Treatment
- UV-Ae0
- Outcome
- plastidic oxidative branch of the pentose phosphate pathway, photorespiration, and malate shuttlee0
- Direction
- activatede0
- Comparator
- monochromatic red lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Lettuce (Lactuca sativa)”
e0“UV-A also activated the plastidic oxidative branch of the pentose phosphate pathway, photorespiration, and malate shuttle”
e1“monochromatic red light as control”
The same questions in other papers
uv · molecular: metabolites · Lactuca sativa (garden lettuce)Positive and negative results
11 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
9 papers more in this group
See all 13 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.