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Heinen, R.* ; Sanchez-Mahecha, O.* ; Martijn Bezemer, T.* ; Dominoni, D.M.* ; Knappe, C. ; Kollmann, J.* ; Kopatsch, A. ; Pfeiffer, Z.A.* ; Schloter, M. ; Sturm, S.* ; Schnitzler, J.-P. ; Vlot, A.C. ; Weisser, W.W.*

Part-night exposure to artificial light at night has more detrimental effects on aphid colonies than fully lit nights.

Philos. Trans. R. Soc. B - Biol. Sci. 378:20220357 (2023)

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Artificial light at night (ALAN) threatens natural ecosystems globally. While ALAN research is increasing, little is known about how ALAN affects plants and interactions with other organisms. We explored the effects of ALAN on plant defence and plant-insect interactions using barley (Hordeum vulgare) and the English grain aphid (Sitobion avenae). Plants were exposed to 'full' or 'part' nights of 15-20 lux ALAN, or no ALAN 'control' nights, to test the effects of ALAN on plant growth and defence. Although plant growth was only minimally affected by ALAN, aphid colony growth and aphid maturation were reduced significantly by ALAN treatments. Importantly, we found strong differences between full-night and part-night ALAN treatments. Contrary to our expectations, part ALAN had stronger negative effects on aphid colony growth than full ALAN. Defence-associated gene expression was affected in some cases by ALAN, but also positively correlated with aphid colony size, suggesting that the effects of ALAN on plant defences are indirect, and regulated via direct disruption of aphid colonies rather than via ALAN-induced upregulation of defences. Mitigating ecological side effects of ALAN is a complex problem, as reducing exposure to ALAN increased its negative impact on insect herbivores. This article is part of the theme issue 'Light pollution in complex ecological systems'.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Alan ; Gene Expression ; Induced Defences ; Light Pollution ; Plant Defence ; Urban Ecology; Plant; Phytochrome; Proteins; Impacts; Defense; Barley; Resistance; Homoptera; Behavior; Immunity

ISSN (print) / ISBN 0962-8436

e-ISSN 1471-2970

Journal Philosophical Transactions of the Royal Society of London. Series B

Quellenangaben Volume: 378, Issue: 1892, Article Number: 20220357

Publisher Royal Society of London

Publishing Place 6-9 Carlton House Terrace, London Sw1y 5ag, England

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Biochemical Plant Pathology (BIOP)
Research Unit Environmental Simulation (BIOP-EUS)
Research Unit Comparative Microbiome Analysis (COMI)

Grants We thank Roman Meier for advice and engineering support in the TUMmesa phytochamber facilities. We thank Hans Hausladen and Stefan Kimmelmann for advice and help in obtaining soil for the pot experiment. We thank Sharon Zytynska for suppo