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. 2017 Jul 17;7:5639. doi: 10.1038/s41598-017-06119-w

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Quantitative measurement of β-caryophyllene emitted by flowering plants of different Arabidopsis thaliana (Col-0 background) accessions: wild type (WT), β-caryophyllene knock-out mutant of At5g23960 (KO) and transgenic line β-caryophyllene synthase-overexpressing At5g23960 (OE). n.f., not found. (b) Responses of D. citri, tested in a 4-arm-olfactometer, to volatiles of two sets of odour sources. WT, KO and OE (see above) Arabidopsis thaliana (black bars) lines were tested against pots with substrate (withe bars). Bars represent the overall percentages of time spent in each of the two odour sources. Error bars represent SE (n = 10 independent test). The number of responding psyllids is indicated in the black bars and the total number of insects tested is given between parentheses for each comparison. Time spent in odor sources were analysed by paired t-test. Asterisks indicate significant differences between odour sources (*P < 0.05).