title: Inoculation of the nonlegume Capsicum annuum L. with Rhizobium strains. 2. Changes in sterols, triterpenes, fatty acids, and volatile compounds.
abstract: Peppers (Capsicum spp.) are consumed worldwide, imparting flavor, aroma, and color to foods, additionally containing high concentrations of biofunctional compounds. This is the first report about the effect of the inoculation of two Rhizobium strains on sterols, triterpenes, fatty acids, and volatile compounds of leaves and fruits of pepper (Capsicum annuum L.) plants. Generally, inoculation with strain TVP08 led to the major changes, being observed a decrease of sterols and triterpenes and an increase of fatty acids, which are related to higher biomass, growth, and ripening of pepper fruits. The increase of volatile compounds may reflect the elicitation of plant defense after inoculation, since the content on methyl salicylate was significantly increased in inoculated material. The findings suggest that inoculation with Rhizobium strains may be employed to manipulate the content of interesting metabolites in pepper leaves and fruits, increasing potential health benefits and defense abilities of inoculated plants.
authors.affiliation: REQUIMTE/Laboratório de Farmacognosia, Departamento de Química, Faculdade de Farmácia, Universidade do Porto , Rua de Jorge Viterbo Ferreira, No. 228, 4050-313 Porto, Portugal.
authors.forename: Luís R
authors.initials: LR
authors.lastname: Silva
authors.forename: Jessica
authors.initials: J
authors.lastname: Azevedo
authors.forename: Maria J
authors.initials: MJ
authors.lastname: Pereira
authors.forename: Lorena
authors.initials: L
authors.lastname: Carro
authors.forename: Encarna
authors.initials: E
authors.lastname: Velazquez
authors.forename: Alvaro
authors.initials: A
authors.lastname: Peix
authors.forename: Patrícia
authors.initials: P
authors.lastname: Valentão
authors.forename: Paula B
authors.initials: PB
authors.lastname: Andrade
mesh_terms: D059827:Agricultural Inoculants / Q000502:physiology*; D002212:Capsicum / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism / Q000382:microbiology*; D005227:Fatty Acids / Q000032:analysis* / Q000378:metabolism; D005638:Fruit / Q000737:chemistry* / Q000254:growth & development / Q000378:metabolism; D010936:Plant Extracts / Q000032:analysis* / Q000378:metabolism; D012231:Rhizobium / Q000502:physiology*; D013261:Sterols / Q000032:analysis* / Q000378:metabolism; D014315:Triterpenes / Q000032:analysis* / Q000378:metabolism; D014675:Vegetables / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism / Q000382:microbiology*; D055549:Volatile Organic Compounds / Q000032:analysis* / Q000378:metabolism
chemical_list: D005227:Fatty Acids; D010936:Plant Extracts; D013261:Sterols; D014315:Triterpenes; D055549:Volatile Organic Compounds
keywords: Capsicum annuum L.; fatty acids; plant-growth-promoting rhizobacteria; sterols; triterpenes; volatile compounds