Isolation of two triterpenoids from Phlomis purpurea, one of them with anti-oomycete activity against Phytophthora cinnamomi, and insights into its biosynthetic pathway

Frontiers in Plant Science

Plant Science

B. Isabel Redondo¹  L. Fernández-Calleja²  F. Lombó²  M. García-Domínguez²  C. J. Villar²  J. L. Gómez Martín³ 

[1] Department Animal Science, Faculty of Veterinary Medicine, Universidad Complutense de Madrid, Madrid, Spain;Research Unit “Biotechnology in Nutraceuticals and Bioactive Compounds-BIONUC”, Departamento de Biología Funcional, Área de Microbiología, Universidad de Oviedo, Oviedo, Spain;Instituto Universitario de Oncología del Principado de Asturias, Oviedo, Spain;Instituto de Investigación Sanitaria del Principado de Asturias, Oviedo, Spain;Research and Development Department, Campojerez SL, Jerez de los Caballeros, Badajoz, Spain;

关键词: anti-oomycete;    root rot;    natural compound;    oomycete;    dieback;   

DOI  :  10.3389/fpls.2023.1180808

 received in 2023-03-06, accepted in 2023-07-27,  发布年份 2023

来源: Frontiers

【 摘 要 】

Phytophthora cinnamomi is an important plant pathogen responsible for dieback diseases in plant genera including Quercus, Fagus, Castanea, Eucalyptus, and Pinus, among others, all over the world. P. cinnamomi infection exerts tremendous ecological and economic losses. Several strategies have been developed to combat this pathogenic oomycete, including the search for novel anti-oomycete compounds. In this work, a Mediterranean vascular plant, Phlomis purpurea, has been screened for secondary bioactivity against this pathogen. The genus Phlomis includes a group of herbaceous plants and shrubs described as producers of many different bioactive compounds, including several triterpenoids. Triterpenoids are well-known molecules synthesized by plants and microorganisms with potent antioxidant, antitumoral, and antimicrobial activities. We have isolated by HPLC-DAD and characterized by HPLC-MS and NMR two nortriterpenoid compounds (phlomispentaol A and phlomispurtetraolone) from the root extracts of P. purpurea. One of them (phlomispentaol A) is active against the plant pathogenic oomycete P. cinnamomi (based on in vitro inhibition bioassays). Based on their chemical structure and their relationship to other plant triterpenoids, oleanolic acid is proposed to be the common precursor for these molecules. The anti-oomycete activity shown by phlomispentaol A represents a promising alternative to counteract the worldwide-scale damage caused to forest ecosystems by this pathogen.

【 授权许可】

Unknown   
Copyright © 2023 Fernández-Calleja, García-Domínguez, Redondo, Martín, Villar and Lombó