Maytenin Plays a Special Role in the Regulation of the Endophytic Bacillus megaterium in Peritassa campestris Adventitious Roots

Author(s)

Inacio, Marielle Cascaes ^[1] ; Paz, Tiago Antunes ^[1] ; Soares Pereira, Ana Maria ^[2] ; Furlan, Maysa ^[1]

Affiliation

^[1] Univ Estadual Paulista, UNESP, Inst Quim, Rua Prof Francisco Degni 55, BR-14800060 Araraquara, SP - Brazil

^[2] Univ Ribeirao Preto, UNAERP, Dept Biotecnol Vegetal, Av Costabile Romano 2201, BR-14096900 Ribeirao Preto, SP - Brazil

• Document type: Journal article
• Source: Journal of Chemical Ecology; v. 45, n. 9, p. 789-797, SEP 2019.
• Web of Science Citations: 0

Abstract

Peritassa campestris (Celastraceae) root bark accumulates potent antitumor quinonemethide triterpenes (QMTs). When grown in their natural habitat, plants of the family Celastraceae produce different QMTs such as celastrol (3) and pristimerin (4). However, when they are inserted in in vitro culture systems, they accumulate maytenin (1) as the main compound. Recently, Bacillus megaterium was detected as an endophytic microorganism (EM) living inside P. campestris roots cultured in vitro. We hypothesized that compound (1) controls EM growth more efficiently, and that the presence of EMs in the root culture causes compound (1) to accumulate. For the first time, this work has explored plant-microorganism interaction in a species of the family Celastraceae by co-culture with an EM. Live endophytic bacteria were used, and QMT accumulation in P. campestris adventitious roots was our main focus. The antimicrobial activity of the main QMTs against endophytic B. megaterium was also evaluated. Our results showed that compound (1) and maytenol (5) were more effective than their precursors QMTs (3) and (4) in controlling the EM. Co-culture of B. megaterium with roots significantly reduced bacterial growth whereas root development remained unaffected. Compound (1) production was 24 times higher after 48 hr in the presence of the highest B. megaterium concentration as compared to the control. Therefore, P. campestris adventitious roots affect the development of the endophyte B. megaterium through production of QMTs, which in turn can modulate production of compound (1). (AU)

• FAPESP's process: 13/07600-3 - CIBFar - Center for Innovation in Biodiversity and Drug Discovery
• Grantee: Glaucius Oliva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 14/19362-2 - Application of biotechnology to evaluate plant-microorganism interaction during production of secondary metabolites in Peritassa campestris and its endophytes
• Grantee: Marielle Cascaes Inácio
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 18/00143-0 - Fungal biotransformation of quinonemethide triterpenes and their (new) structure-activity relationship on tumor cell lines
• Grantee: Marielle Cascaes Inácio
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor