Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.2c03309
Keywords
basil (Ocimum basilicum L.); light spectra; light-emitting diodes; secondary chemistry; phenolics; phenolic acids; terpenoids; leaf anatomy; glandular trichome; photosynthesis; pigment
Funding
- Academy of Finland [267360, 278424]
- Egyptian Ministry of Higher Education, Cultural Affairs and Missions Sector
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Basil growth and secondary compounds can be influenced by different light spectra. Spectrum C led to higher concentrations of phenolic acids and dry weight, but lower water content. Spectrum A and B resulted in higher concentrations and emissions of terpenoids and phenylpropanoids.
Basil (Ocimum basilicum, cv. Dolly) grew under three different light spectra (A, B, and C) created by light-emitting diode lamps. The proportions of UV-A, blue, and green-yellow wavelengths decreased linearly from A to C, and the proportions of red and far-red wavelengths increased from A to C. Photosynthetic photon flux density was 300 mu mol m(-2) s(-1) in all spectra. The spectrum C plants had highest concentrations of phenolic acids (main compounds: rosmarinic acid and cichoric acid), lowest concentrations and emissions of phenylpropanoid eugenol and terpenoids (main compounds: linalool and 1,8-cineole), highest dry weight, and lowest water content. Conversely, spectra A and B caused higher terpenoid and eugenol concentrations and emissions and lower concentrations of phenolic acids. High density of peltate glandular trichomes explained high terpenoid and eugenol concentrations and emissions. Basil growth and secondary compounds affecting aroma and taste can be modified by altering light spectra; however, increasing terpenoids and phenylpropanoids decreases phenolic acids and growth and vice versa.
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