Lippia filifolia Mart. & Schauer belongs to the Verbenaceae family and it is endemic from the rupestrian fields of the Espinhaço mountain range, located in Minas Gerais, Brazil. It is an aromatic species with medicinal potential due to the production of volatile compounds that constitute its essential oil. The objective of this work was to evaluate the effects of light quality using light-emitting diodes (LEDs) over the growth of L. filifolia grown in vitro after 45 days of culture, analyzing its volatile organic compounds (VOCs), biochemical, and biometric traits. This study had four treatments according to the wavelength of LED lamps: (i) white (control), (ii) blue, (iii) red, and (iv) a combination of red + blue (mix). The light quality influenced the growth, metabolism, and VOCs production of plantlets. The specimens showed higher height under red and white treatments and higher biomass accumulation, nodal segments, and shoot numbers under the mix treatment. Higher total carbohydrate content was also observed on the mix treatment, while the white LED provided higher chlorophylls and carotenoids contents. In addition, the lipid peroxidation was more pronounced in mix and white LEDs treatments, and it was also observed significant but not quite changes in VOCs profiles due to light quality. Eucalyptol was the compound found in a higher concentration among the VOCs of L. filifolia grown in vitro at all light quality treatments studied.

Lippia filifolia Mart。＆Schauer属于马鞭草科，它是巴西米纳斯吉拉斯州Espinhaço山脉的行山野的特有种。由于产生构成其精油的挥发性化合物，因此它是具有药用潜力的芳香族物质。这项工作的目的是评估使用发光二极管（LED）的光质量对体外培养的金丝百合生长的影响。培养45天后，分析其挥发性有机化合物（VOC），生化和生物特征。这项研究根据LED灯的波长进行了四种处理：（i）白色（对照），（ii）蓝色，（iii）红色和（iv）红色+蓝色（混合）的组合。光照质量影响幼苗的生长，代谢和VOC的产生。在红色和白色处理下，标本显示出更高的高度，在混合处理下，标本显示出更高的生物量积累，节节和芽数。在混合处理中还观察到更高的总碳水化合物含量，而白色LED提供了更高的叶绿素和类胡萝卜素含量。此外，在混合和白色LED处理中，脂质过氧化作用更为明显，并且由于光质量，还观察到VOCs曲线有明显变化，但变化不大。在研究的所有光质量处理下，桉树醇是在体外生长的丝状叶菌的VOC中含量较高的化合物。