title: Chemical characterization of Citrus sinensis grafted on C. limonia and the effect of some isolated compounds on the growth of Xylella fastidiosa.
abstract: Citrus sinensis grafted on C. limonia produces a considerable number of compounds that are not common in both plants developed from germination of seeds. The chemical profile of scion and rootstock differ notably for absence in the form of flavonoids and coumarins containing C5 prenyl groups attached to the carbon atoms of aromatic and heterocyclic systems or to oxygen. Only linear pyranocoumarins xanthyletin and xanthoxyletin were found in scion. This observation indicates that the prenylated compounds once biosynthesized in the roots could have been translocated to other organs. Xylella fastidiosa colonizes the xylem of plants causing diseases on several economically important crops such as citrus variegated chlorosis (CVC). A number of flavonoids, coumarins, alkaloids, dihydrocinnamic acid derivative, anacardic acid, triterpenes, and limonoids were tested for in vitro activity on the growth of Xylella fastidiosa. Azadirachtin A was the most active. Hesperidin, which occurs in great amounts in cells of the mesophyll of the affected leaves with CVC, showed a moderate activity suggesting that it can act as a good barrier for small-size colonies from X. fastidiosa.
authors.affiliation: Departamento de Química, Universidade Federal de São Carlos, CP 676, 13565-905 São Carlos, São Paulo, Brazil.
authors.forename: Alan Bezerra
authors.initials: AB
authors.lastname: Ribeiro
authors.forename: Patrícia Verardi
authors.initials: PV
authors.lastname: Abdelnur
authors.forename: Cleverson Fernando
authors.initials: CF
authors.lastname: Garcia
authors.forename: Adriana
authors.initials: A
authors.lastname: Belini
authors.forename: Vanessa G Pasqualotto
authors.initials: VG
authors.lastname: Severino
authors.forename: M Fátima das G F
authors.initials: MF
authors.lastname: da Silva
authors.forename: João B
authors.initials: JB
authors.lastname: Fernandes
authors.forename: Paulo C
authors.initials: PC
authors.lastname: Vieira
authors.forename: Sérgio A
authors.initials: SA
authors.lastname: de Carvalho
authors.forename: Alessandra A
authors.initials: AA
authors.lastname: de Souza
authors.forename: Marcos A
authors.initials: MA
authors.lastname: Machado
mesh_terms: D000890:Anti-Infective Agents / Q000032:analysis / Q000494:pharmacology*; D001947:Breeding; D002957:Citrus / Q000737:chemistry*; D032084:Citrus sinensis / Q000737:chemistry*; D006569:Hesperidin / Q000032:analysis / Q000494:pharmacology; D036701:Limonins / Q000032:analysis / Q000494:pharmacology; D010935:Plant Diseases; D018515:Plant Leaves / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D044167:Xylella / Q000187:drug effects* / Q000254:growth & development*
chemical_list: D000890:Anti-Infective Agents; D036701:Limonins; D006569:Hesperidin; C010329:azadirachtin