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Response of thymus lotocephalus in vitro cultures to drought stress and role of green extracts in cosmetics
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Orientador(es)
Resumo(s)
The impact of drought stress induced by polyethylene glycol (PEG) on morphological,
physiological, (bio)chemical, and biological characteristics of Thymus lotocephalus López and Morales
shoot cultures have been investigated, as well as the potential of iron oxide nanoparticles, salicylic
acid, and methyl jasmonate (MeJA) as alleviating drought stress agents. Results showed that PEG
caused oxidative stress in a dose-dependent manner, raising H2O2
levels and reducing shoots’ growth,
photosynthetic pigment contents, and phenolic compounds production, especially phenolic acids,
including the major compound rosmarinic acid. Moreover, Fourier Transform Infrared Spectra
analysis revealed that PEG treatment caused changes in shoots’ composition, enhancing terpenoids
biosynthesis. PEG also decreased the biological activities (antioxidant, anti-tyrosinase, and photoprotective) of the eco-friendly extracts obtained with a Natural Deep Eutectic Solvent. MeJA was
the most efficient agent in protecting cells from oxidative damage caused by drought, by improving
the biosynthesis of phenolics, like methyl 6-O-galloyl-β-D-glucopyranoside and salvianolic acids, as
well as improving the extracts’ antioxidant activity. Altogether, the obtained results demonstrated a
negative impact of PEG on T. lotocephalus shoots and an effective role of MeJA as a mitigating agent
of drought stress. Additionally, extracts showed a good potential to be used in the cosmetics industry
as skincare products.
Descrição
Palavras-chave
Aromatic plan Abiotic stress Green extract Phenolics Tyrosinase inhibition UV protecting extracts
Contexto Educativo
Citação
Antioxidants 11 (8): 1475 (2022)
Editora
MDPI