Linalool Induces Resistance Against Tobacco Mosaic Virus in Tobacco Plants

Abstract

The essential oil of Cinnamomum camphora is the most widely consumed and used spice in the world today. It has therapeutic effects in medicine and has been shown to have good antibacterial and bacteriostatic effects in agriculture. This study found that C. camphora oil significantly induced plant disease resistance activity. Linalool, its main active component, significantly induced plant disease resistance activity (67.49% at a concentration of 800 μg/ml) over the same concentration of the chitosan oligosaccharide positive control, but had no direct effect on TMV. In this study of its antiviral mechanism, linalool induced hypersensitive reaction (HR), the overexpression of related defense enzymes SOD, CAT, POD and PAL, the accumulation of H2O2 and SA content in N. glutnosa. Besides, linalool induced crops resistance against Colletotrichum lagenarium, Botrytis cinerea, Sclerotinia sclerotiorum and Phytophthora capsica. Taken together, the anti-TMV mechanism of linalool involved the induction of plant disease resistance through activation of a plant immune response mediated by salicylic acid. Linalool-induced plant disease resistance activity has a long duration, broad spectrum, and rich resources; linalool thus has the potential to be developed as a new plant-derived antiviral agent and plant immune activator.

Linalool’s Multifaceted Antimicrobial Potential: Unveiling its Antimicrobial Efficacy and Immunomodulatory Role AgainstSaprolegnia parasitica

“…Linalool, a monoterpene alcohol found in various EOs, has shown promising antimicrobial activity against a wide range of pathogens [13] . Our groups and other research teams have reported that linalool exhibits antimicrobial activity against bacteria such as Escherichia coli [12] , Listeria monocytogenes [14] , Elizabethkingia miricola , Streptococcus pyogenes [15] , Pseudomonas fragi [16] , staphylococcus aureus [17] , Brochothrix thermosphacta [18] and Aeromonas hydrophila [19] , as well as against oomycetes like Colletotrichum lagenarium [20] and Phytophthora capsici [21] , and fungi including Aspergillus flavus [22] , Penicillium citrinum , Chaetomium globosum [23] , Colletotrichum gloesporioides , Fusarium oxysporum [24] , Botrytis cinerea [25] and Candida albicans [26] . Although the antimicrobial activity of linalool has been extensively studied in vitro , the potential immune mechanism in vivo remains poorly understood.…”