title: Essential Oil Variation from Twenty Two Genotypes of Citrus in Brazil-Chemometric Approach and Repellency Against Diaphorina citri Kuwayama.
abstract: The chemical composition of volatile oils from 22 genotypes of Citrus and related genera was poorly differentiated, but chemometric techniques have clarified the relationships between the 22 genotypes, and allowed us to understand their resistance to D. citri. The most convincing similarities include the synthesis of (Z)-β-ocimene and (E)-caryophyllene for all 11 genotypes of group A. Genotypes of group B are not uniformly characterized by essential oil compounds. When stimulated with odor sources of 22 genotypes in a Y-tube olfactometer D. citri preferentially entered the arm containing the volatile oils of Murraya paniculata, confirming orange jasmine as its best host. C. reticulata × C. sinensis was the least preferred genotype, and is characterized by the presence of phytol, (Z)-β-ocimene, and β-elemene, which were not found in the most preferred genotype. We speculate that these three compounds may act as a repellent, making these oils less attractive to D. citri.
authors.affiliation: Departamento de Qu&#237;mica, Universidade Federal de S&#227;o Carlos, CP 676, S&#227;o Carlos-SP 13565-905, Brazil. msandrade2003@gmail.com.
authors.forename: Moacir Dos Santos
authors.initials: Mdos S
authors.lastname: Andrade
authors.affiliation: Departamento de Entomologia e Acarologia, Universidade de S&#227;o Paulo, Escola Superior de Agricultura Luiz de Queiroz (USP/ESALQ)-Av. P&#225;dua Dias, 11, Agronomia, CEP 13418-900, Piracicaba-SP, Brazil. leandroribeiro@epagri.sc.gov.br.
authors.forename: Leandro do Prado
authors.initials: Ldo P
authors.lastname: Ribeiro
authors.affiliation: Departamento de Entomologia e Acarologia, Universidade de S&#227;o Paulo, Escola Superior de Agricultura Luiz de Queiroz (USP/ESALQ)-Av. P&#225;dua Dias, 11, Agronomia, CEP 13418-900, Piracicaba-SP, Brazil. pcbogorni@yahoo.com.br.
authors.forename: Paulo Cesar
authors.initials: PC
authors.lastname: Borgoni
authors.affiliation: Departamento de Qu&#237;mica, Universidade Federal de S&#227;o Carlos, CP 676, S&#227;o Carlos-SP 13565-905, Brazil. dmfs@ufscar.br.
authors.forename: Maria Fátima das Graças Fernandes da
authors.initials: MF
authors.lastname: Silva
authors.affiliation: Departamento de Qu&#237;mica, Universidade Federal de S&#227;o Carlos, CP 676, S&#227;o Carlos-SP 13565-905, Brazil. mrforim@gmail.com.
authors.forename: Moacir Rossi
authors.initials: MR
authors.lastname: Forim
authors.affiliation: Departamento de Qu&#237;mica, Universidade Federal de S&#227;o Carlos, CP 676, S&#227;o Carlos-SP 13565-905, Brazil. djb@ufscar.br.
authors.forename: João Batista
authors.initials: JB
authors.lastname: Fernandes
authors.affiliation: Departamento de Qu&#237;mica, Universidade Federal de S&#227;o Carlos, CP 676, S&#227;o Carlos-SP 13565-905, Brazil. dpcv@ufscar.br.
authors.forename: Paulo Cezar
authors.initials: PC
authors.lastname: Vieira
authors.affiliation: Departamento de Entomologia e Acarologia, Universidade de S&#227;o Paulo, Escola Superior de Agricultura Luiz de Queiroz (USP/ESALQ)-Av. P&#225;dua Dias, 11, Agronomia, CEP 13418-900, Piracicaba-SP, Brazil. jdvendra@usp.br.
authors.forename: José Djair
authors.initials: JD
authors.lastname: Vendramin
authors.affiliation: Centro APTA Citros Sylvio Moreira, Instituto Agron&#244;mico, CP 04, Cordeir&#243;polis-SP 13490-970, Brazil. marcos@centrodecitricultura.br.
authors.forename: Marcos Antônio
authors.initials: MA
authors.lastname: Machado
mesh_terms: D000818:Animals; D001938:Brazil; D002957:Citrus / Q000187:drug effects* / Q000235:genetics / Q000469:parasitology; D005838:Genotype; D006430:Hemiptera / Q000187:drug effects* / Q000472:pathogenicity; D007302:Insect Repellents / Q000737:chemistry / Q000494:pharmacology; D009822:Oils, Volatile / Q000737:chemistry / Q000494:pharmacology*; D010836:Phytol / Q000737:chemistry / Q000494:pharmacology; D010938:Plant Oils / Q000737:chemistry / Q000494:pharmacology*; D012717:Sesquiterpenes / Q000737:chemistry / Q000494:pharmacology
chemical_list: D007302:Insect Repellents; D009822:Oils, Volatile; D010938:Plant Oils; D012717:Sesquiterpenes; C038905:elemene; D010836:Phytol
keywords: C. reticulate; C. sinensis; Citrus; Diaphorina citri; GC-MS; Huanglongbing; Murraya paniculata; chemometrics; essential oil; olfactory