Abstract
Key message
Blue and yellow light affected metabolism and the morphology. Blue and red promote the DOXP/MEP pathway. ADS gene expression was increased in plants cultivated under blue, promoting artemisinin content.
Abstract
Artemisinin-based combination therapies are the most effective treatment for highly lethal malaria. Artemisinin is produced in small quantities in the glandular trichomes of Artemisia annua L. Our aim was to evaluate the effect of light quality in A. annua cultivated in vitro under different light qualities, considering anatomical and morphological changes, the volatile composition, artemisinin content and the expression of two key enzymes for artemisinin biosynthesis. Yellow light is related to the increase in the number of glandular trichomes and this seemed to positively affect the molecular diversity in A. annua. Yellow light-stimulated glandular trichome frequency without triggered area enhancement, whereas blue light stimulated both parameters. Blue light enhanced the thickness of the leaf epidermis. The B-promoting effect was due to increased cell size and not to increased cell numbers. Green and yellow light positively influenced the volatile diversity in the plantlets. Nevertheless, blue and red light seemed to promote the DOXP/MEP pathway, while red light stimulates MVA pathway. Amorpha-4,11-diene synthase gene expression was significantly increased in plants cultivated under blue light, and not red light, promoting artemisinin content. Our results showed that light quality, more specifically blue and yellow light, positively affected secondary metabolism and the morphology of plantlets. It seemed that steps prior to the last one in the artemisinin biosynthesis pathway could be strongly influenced by blue light. Our work provides an alternative method to increase the amount of artemisinin production in A. annua without the use of transgenic plants, by the employment of blue light.
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Data availability statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.
Abbreviations
- ACT:
-
Artemisinin combination therapies
- ADS:
-
Amorpha-4,11-diene synthase
- B:
-
Monochromatic blue light
- CRY:
-
Cryptochrome
- CYP71AV1:
-
Cytochrome P450 monooxygenase
- D:
-
Darkness
- dNTPs:
-
Deoxyribonucleoside 5′-triphosphate
- DOXP/MEP:
-
2Cmethyl-d-erythritol-4-phosphate pathway
- DTT:
-
Dithiothreitol
- FAA:
-
37% formaldehyde, glacial acetic acid, and 70% ethanol solution
- G:
-
Monochromatic green light
- Gl.T:
-
Glandular trichomes
- LED:
-
Light-emitting diode
- LRI:
-
Linear retention indices
- MS:
-
Murashige and Skoog
- MVA:
-
Mevalonic acid pathway
- NIST:
-
National Institute of Standards and Technology
- PAR:
-
Photosynthetically active radiation
- PDMS:
-
Polydimethylsiloxane
- PHOT:
-
Phototropin
- P.P:
-
Palisade parenchyma
- R:
-
Monochromatic red light
- SEM:
-
Scanning electron microscopy
- S.P:
-
Spongy parenchyma
- TT:
-
T-shape trichome
- W:
-
White fluorescent light
- Y:
-
Monochromatic yellow light
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Acknowledgements
We thank Prof. Pedro Melillo (CPQBA/UNICAMP) for providing the seeds and Durvalina Felix-Whipps and Rosângela de Almeida Epifanio (in memoriam) for technical and scientific support.
Funding
This work was supported by Foundation for Research Support of the State of Rio de Janeiro (FAPERJ) [E-26/111.372/2011]; National Council for Scientific and Technological Development (CNPq) [Grant numbers 310474/2015-9, 159779/2013-8]; Coordination of Improvement of Higher Education Personnel (CAPES); and Federal University of Rio de Janeiro State (UNIRIO).
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AFM supervised the project; AFM, EST, MA-F, HRB, ACAA-D and ALV designed the experiments; EML, EST and AFM wrote the manuscript, with the participation of FG-D, ALM and contributions from all authors; tissue culture experiments were conducted by EML and AFM; morphological assays were conducted by AFM, EST, TSSG and ACAA-D; volatile assays were advised by HRB and conducted by EML and AFM; artemisinin analysis was conducted by ALM under the supervision of ALV and MCM; gene expression assays were conducted by EML and FG-D under the supervision of MA-F. All authors critically revised the manuscript and gave their final approval.
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Lopes, E.M., Guimarães-Dias, F., Gama, T.d.S.S. et al. Artemisia annua L. and photoresponse: from artemisinin accumulation, volatile profile and anatomical modifications to gene expression. Plant Cell Rep 39, 101–117 (2020). https://doi.org/10.1007/s00299-019-02476-0
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DOI: https://doi.org/10.1007/s00299-019-02476-0