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Out of and into Africa: Odour-mediated interaction and detection of the human commensal Drosophila melanogaster and the invasive fly Drosophila suzukii

Kwadha, Charles (2022). Out of and into Africa: Odour-mediated interaction and detection of the human commensal Drosophila melanogaster and the invasive fly Drosophila suzukii. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-957-5
eISBN 978-91-7760-958-2
[Doctoral thesis]

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Abstract

Living organisms use their sense of smell to discriminate odours. Humans can sense females of the cosmopolitan Drosophila melanogaster, but whether humans can discriminate the cosmopolitan D. melanogaster strain from the conspecific Zimbabwe strain, was unknown. We showed that the cosmopolitan females emit a pheromonal aldehyde, (4Z)-4-undecenal (Z4-11Al), while Zimbabwe females emit Z4-11Al and (4Z)-4-nonenal (Z4-9Al), and that humans can discriminate the scent of the two strains. The aldehydes are oxidation products of cuticular dienes. Since across Drosophila species dienes have biological activities and can, during oxidization produce aldehydes, we propose that the aldehydes are involved in reproductive isolation. Another part of the thesis addresses a closely related species of D. melanogaster, D. suzukii, which is an invasive pest that damages soft fruits and causes financial losses. Its distribution in Sub-Saharan Africa was unknown. Traps targeting D. suzukii often attract non-target species such as D. melanogaster. We showed that D. suzukii is present in Kenya and that a mutualistic yeast, Hanseniaspora uvarum, can improve selectivity of traps. Curiously, on fruit, presence of D. melanogaster induces oviposition avoidance in D. suzukii. We showed that D. suzukii is present in Kenya and that a mutualistic yeast, Hanseniaspora uvarum, can improve selectivity of traps. We established that Z4-11Al partly induces the avoidance observed in D. suzukii. Altogether, our findings advance our understanding of the principle of olfaction across phylogenetically distant species, the dispersal of D. suzukii in Africa, and the potential of H. uvarum and chemo-ecological interactions in enhancing sound management of D. suzukii.

Authors/Creators:Kwadha, Charles
Title:Out of and into Africa: Odour-mediated interaction and detection of the human commensal Drosophila melanogaster and the invasive fly Drosophila suzukii
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2022
Number:2022:41
Number of Pages:65
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-957-5
ISBN for electronic version:978-91-7760-958-2
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:olfaction, semiochemicals, human commensal, Drosophila, egg-laying, heterospecific interaction
URN:NBN:urn:nbn:se:slu:epsilon-p-118534
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-118534
ID Code:28525
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Protection Biology
Deposited By: SLUpub Connector
Deposited On:24 Aug 2022 07:15
Metadata Last Modified:25 Aug 2022 23:34

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