부산대학교 도서관

In the present study, we used different LEDs to evaluate their effect on metabolic and transcriptional reprogramming of two genotypes (Ilam and Isfahan) of lemon balm grown under narrow-band LED lighting. Lemon balm plants were grown in four incubators equipped with artificial lighting and subjected to four LED lamps [White, Blue, Red, and mixed RB (Red + Blue) (70%:30%)] and in greenhouse conditions for 7 weeks. The results showed significant increases in leaf number, pigment and soluble sugar contents, secondary metabolites, and calcium, magnesium, potassium and amino acid contents achieved in growth under mixed RB LEDs. As observed for the content of total phenolics, rosmarinic acid, and amino acids, the expression of genes involved in their production, including TAT , RAS , and DAHPS were also enhanced due to the mixed RB LED lighting. The best condition for both the plant growth and expression of genes was under the mixture of Red + Blue LED lamps. These observations indicate that the increase in secondary metabolites under mixed Red + Blue lights may be due to the increase in primary metabolites synthesis and the increased expression of genes that play an essential role in the production of secondary metabolites. A comparison among four light emitting diode (LED) and greenhouse lights was made to see how light quality may improve metabolism of rosmarinic acid and amino acids in lemon balm (Melissa officinalis L.). Plants had better growth under LED treatments in comparison to greenhouse light. The mixture of Red + Blue LEDs led to better morphological characteristics and a higher amount of primary and secondary metabolites and amino acids. [ABSTRACT FROM AUTHOR]