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Molecules 2016, 21(6), 814; doi:10.3390/molecules21060814

Essential Oil Variation from Twenty Two Genotypes of Citrus in Brazil—Chemometric Approach and Repellency Against Diaphorina citri Kuwayama

1
Departamento de Química, Universidade Federal de São Carlos, CP 676, São Carlos-SP 13565-905, Brazil
2
Departamento de Entomologia e Acarologia, Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz (USP/ESALQ)-Av. Pádua Dias, 11, Agronomia, CEP 13418-900, Piracicaba-SP, Brazil
3
Centro APTA Citros Sylvio Moreira, Instituto Agronômico, CP 04, Cordeirópolis-SP 13490-970, Brazil
*
Author to whom correspondence should be addressed.
Academic Editor: Isabel C. F. R. Ferreira
Received: 21 May 2016 / Revised: 15 June 2016 / Accepted: 17 June 2016 / Published: 22 June 2016
(This article belongs to the Collection Bioactive Compounds)
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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. View Full-Text
Keywords: Citrus; C. reticulate; C. sinensis; Murraya paniculata; Diaphorina citri; Huanglongbing; essential oil; olfactory; chemometrics; GC-MS Citrus; C. reticulate; C. sinensis; Murraya paniculata; Diaphorina citri; Huanglongbing; essential oil; olfactory; chemometrics; GC-MS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Andrade, M.S.; Ribeiro, L.P.; Borgoni, P.C.; Silva, M.F.G.F.; Forim, M.R.; Fernandes, J.B.; Vieira, P.C.; Vendramin, J.D.; Machado, M.A. Essential Oil Variation from Twenty Two Genotypes of Citrus in Brazil—Chemometric Approach and Repellency Against Diaphorina citri Kuwayama. Molecules 2016, 21, 814.

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