Abstract
The characterisation of photoreceptor signalling pathways, combined with recent advancements in LED lighting technology, has opened new opportunities for using narrowband UV wavelengths to selectively enhance activity of specific plant metabolic pathways by applying the most effective wavelengths, while minimizing undesired UV-induced responses. This approach can be hypothesised to enable growers to increase secondary metabolite content in horticulturally relevant crops. This study investigated how different narrowband UV-A and UV-B wavelengths (310, 325, 340, and 365 nm) modulate monoterpene and sesquiterpene accumulation, as well as the expression of key regulators in the terpenoid biosynthesis pathway in Mentha spicata L. Mint plantlets. Results show that shorter UV wavelengths, particularly 310 nm and 325 nm, were effective in enhancing accumulation of specific monoterpenes such as α-pinene, thujene, β-pinene and limonene. Longer UV wavelengths were considerably less effective in driving accumulation of these monoterpenes. Sesquiterpene accumulation was not significantly affected by any UV wavelength. Thus, this study shows wavelength-specific accumulation of terpenes, particularly monoterpenes in plants exposed to 310 nm UV-B. Interestingly, gene expression profiling revealed that the majority of targeted transcripts, encoding key enzymes in the terpenoid pathway, displayed the strongest upregulation when mint plants were exposed to 340 nm UV. This finding highlights the complexity of regulation of the terpenoid biosynthesis pathway, and the potential of narrowband UV treatments as a precise tool to modulate the synthesis of specific secondary metabolites in crops of horticultural interest.
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Claims 7
Claim · model-written summary
310 nm UV enhanced accumulation of α-pinene, thujene and β-pinene in mint.
- Taxon
- Mentha spicata L.
Mentha spicatae1 - Organ / stage
- plantletse1
- Treatment
- 310 nme0
- Outcome
- accumulation of specific monoterpenes such as α-pinene, thujene, β-pinenee0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shorter UV wavelengths, particularly 310 nm and 325 nm, were effective in enhancing accumulation of specific monoterpenes such as α-pinene, thujene, β-pinene and limonene”
e1“Mentha spicata L. Mint plantlets”
Claim · model-written summary
310 nm UV enhanced limonene accumulation in mint.
- Taxon
- Mentha spicata L.Mentha spicatae1
- Treatment
- 310 nme0
- Outcome
- limonenee0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shorter UV wavelengths, particularly 310 nm and 325 nm, were effective in enhancing accumulation of specific monoterpenes such as α-pinene, thujene, β-pinene and limonene”
e1“Mentha spicata L. Mint plantlets”
Claim · model-written summary
325 nm UV enhanced accumulation of α-pinene, thujene and β-pinene in mint.
- Taxon
- Mentha spicata L.Mentha spicatae1
- Treatment
- 325 nme0
- Outcome
- accumulation of specific monoterpenes such as α-pinene, thujene, β-pinenee0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shorter UV wavelengths, particularly 310 nm and 325 nm, were effective in enhancing accumulation of specific monoterpenes such as α-pinene, thujene, β-pinene and limonene”
e1“Mentha spicata L. Mint plantlets”
Claim · model-written summary
325 nm UV enhanced limonene accumulation in mint.
- Taxon
- Mentha spicata L.Mentha spicatae1
- Treatment
- 325 nme0
- Outcome
- limonenee0
- Direction
- enhancinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shorter UV wavelengths, particularly 310 nm and 325 nm, were effective in enhancing accumulation of specific monoterpenes such as α-pinene, thujene, β-pinene and limonene”
e1“Mentha spicata L. Mint plantlets”
Claim · model-written summary
Longer UV wavelengths were less effective for monoterpene accumulation.
- Taxon
- Mentha spicata L.Mentha spicatae1
- Treatment
- Longer UV wavelengthse0
- Outcome
- accumulation of these monoterpenese0
- Direction
- less effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Longer UV wavelengths were considerably less effective in driving accumulation of these monoterpenes”
e1“Mentha spicata L. Mint plantlets”
Claim · model-written summary
No tested UV wavelength significantly affected sesquiterpene accumulation.
- Taxon
- Mentha spicata L.Mentha spicatae1
- Treatment
- any UV wavelengthe0
- Outcome
- Sesquiterpene accumulatione0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sesquiterpene accumulation was not significantly affected by any UV wavelength”
e1“Mentha spicata L. Mint plantlets”
Claim · model-written summary
Targeted terpenoid enzyme transcripts were most strongly upregulated under 340 nm UV.
- Taxon
- minte0
- Treatment
- 340 nm UVe0
- Outcome
- targeted transcripts, encoding key enzymes in the terpenoid pathwaye0
- Direction
- strongest upregulatione0
Not reportedComparator
Verbatim
e0“majority of targeted transcripts, encoding key enzymes in the terpenoid pathway, displayed the strongest upregulation when mint plants were exposed to 340 nm UV”
The same questions in other papers
uv · molecular: metabolites · Mentha spicata (spearmint)Positive and negative results
2 in the opposite direction
- positive
- positive
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.