Synergistic effects of insect herbivory and changing climate on plant volatile emissions in the subarctic tundra

Rieksta, Jolanta; Li, Tao; Michelsen, Anders; Rinnan, Riikka

doi:10.1111/gcb.15773

Cited by 9 publications

(15 citation statements)

References 64 publications

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“…Global climate change brings about elevated average temperatures (IPCC, 2021), which induce severe biochemical and physiological changes in plants (Song et al, 2014). High-temperature (HT) stress and insect herbivory alter the VOC profiles of plants (Rieksta et al, 2021). In this study, we investigated how HT pre-treatment of potato plants affects the choices of the specialist herbivore, potato tuber worm, P. operculella and the generalist egg parasitoid, T. chilonis.…”

Section: Suppressing Vocs Emission Disrupted the Choice Preference Of...mentioning

confidence: 99%

Heat stress affects potato's volatile emissions that mediate agronomically important trophic interactions

Munawar

Zhang

Zhong

et al. 2022

Plant Cell & Environment

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Potato, a cool-weather crop, emits volatile organic compounds (VOCs) which attract the specialist herbivore, Phthorimaea operculella, but also this herbivore's parasitic wasp, Trichogramma chilonis, an important biocontrol agent. What happens to this trophic system when heat stress challenges this agro-ecosystem? We studied how high temperature (HT) pre-treatments influence potato's VOC emissions and their subsequent effects on the preferences of insects, as evaluated in oviposition assays and Y-tube olfactometers. HT pre-stressed plants were less attractive to P. operculella adult moths, which were repelled by HT VOCs, but increased the recruitment of the parasitoid, T. chilonis, which were attracted. VOC emissions, including the most abundant constituent, ß-caryophyllene, were enhanced by HT treatments; some constituents elicited stronger behavioural responses than others.Transcripts of many genes in the biosynthetic pathways of these VOCs were significantly enhanced by HT treatment, suggesting increases in de novo biosynthesis. HT increased the plant's stomatal apertures, and exogenous applications of the hormone, ABA, known to suppress stomatal apertures, reduced leaf volatile emissions and affected the HT-altered plant attractions to both insects.From these results, we infer that HT stress affects this plant-insect interaction through its influence on VOC emissions, potentially decreasing herbivore ovipositions while increasing ovipositions of the parasitoid.

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Section: Suppressing Vocs Emission Disrupted the Choice Preference Of...mentioning

confidence: 99%

Heat stress affects potato's volatile emissions that mediate agronomically important trophic interactions

Munawar

Zhang

Zhong

et al. 2022

Plant Cell & Environment

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“…Large mammal herbivory did not affect the magnitude of BVOC emissions, although there was a non-significant indication of reducing emissions. Contrastingly, insect herbivory has been shown repeatedly to increase BVOC emissions (Rieksta et al, 2021;Ghimire et al, 2021;Rieksta et al, 2020;Li et al, 2019;Faiola et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

“…Alternatively, these compounds may serve a dual role as olfactory cues that function to improve foraging success in large mammals as the role of many volatiles in mammalian herbivory is not well known (Kimball et al, 2012;Moore et al, 2004;Palo, 1984). Previous research has evaluated the effect of herbivory on BVOC emissions, but primarily from the perspective of insect herbivory or herbivory in general (Rieksta et al, 2021(Rieksta et al, , 2020Ghimire et al, 2021;Li et al, 2019;Faiola et al, 2015;Rinnan, 2013); explicit consideration of large mammal herbivory on BVOC dynamics is not well established (Vowles and Björk, 2019;Bartolome et al, 2007). Further research into interactions between plants and large mammalian herbivore through BVOCs, especially regarding anti-browsing vs olfactory cues, may increase understanding of herbivores' role in structuring plant communities, as our data suggest that large mammalian herbivores and specific BVOC compounds may influence each other.…”

Section: Discussionmentioning

confidence: 99%

Herbivore-shrub interactions influence ecosystem respiration and BVOC composition in the subarctic

Brachmann

Vowles

Rinnan

et al. 2023

Preprint

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Abstract. Arctic ecosystems are warming nearly four times faster than the global average which is resulting in plant community shifts and subsequent changes in biogeochemical processes such as gaseous fluxes. Additionally, herbivores shape plant communities and thereby alter the magnitude and composition of ecosystem respiration and BVOC emissions. Here we determine the effect of large mammalian herbivores on ecosystem respiration and BVOC emissions in two southern and two northern sites in Sweden, encompassing mountain birch (LOMB) and shrub heath (LORI) communities in the south and low-herb meadow (RIGA) and shrub heath (RIRI) communities in the north. Herbivory significantly decreased ecosystem respiration at RIGA and altered the BVOC composition between sites. However, plant community composition had a larger effect on ecosystem respiration as RIGA had 35 % higher emissions than the next highest emitting site (LOMB). Additionally, LOMB had the highest emissions of terpenes with the northern sites having significantly lower emissions. Differences between sites were primarily due to differences in exclosure effects, soil temperature and prevalence of different shrub growth forms. Our results suggest that herbivory has a significant effect on trace gas fluxes in a productive meadow community and differences between communities may be driven by differences in shrub composition.

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“…Two earlier studies indicate that plants exhibit stronger VOC responses to the combination of herbivory and warming than to either of these stressors alone (Li et al, 2019;Rieksta et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…However, a recent study by Rieksta et al (2021) suggested that herbivory effects on plant VOC emissions are also modified by gradual changes in plant anatomical traits under climate change.…”

Section: Introductionmentioning

confidence: 99%

Volatile responses of dwarf birch to mimicked insect herbivory and experimental warming at two elevations in Greenlandic tundra

Rieksta

Davie‐Martin

et al. 2023

Plant Enviro Interactions

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Plants release a complex blend of volatile organic compounds (VOCs) in response to stressors. VOC emissions vary between contrasting environments and increase with insect herbivory and rising temperatures. However, the joint effects of herbivory and warming on plant VOC emissions are understudied, particularly in high latitudes, which are warming fast and facing increasing herbivore pressure. We assessed the individual and combined effects of chemically mimicked insect herbivory, warming, and elevation on dwarf birch (Betula glandulosa) VOC emissions in high‐latitude tundra ecosystems in Narsarsuaq, South Greenland. We hypothesized that VOC emissions and compositions would respond synergistically to warming and herbivory, with the magnitude differing between elevations. Warming increased emissions of green leaf volatiles (GLVs) and isoprene. Herbivory increased the homoterpene, (E)‐4,8‐dimethyl‐1,3,7‐nonatriene, emissions, and the response was stronger at high elevation. Warming and herbivory had synergistic effects on GLV emissions. Dwarf birch emitted VOCs at similar rates at both elevations, but the VOC blends differed between elevations. Several herbivory‐associated VOC groups did not respond to herbivory. Harsher abiotic conditions at high elevations might not limit VOC emissions from dwarf birch, and high‐elevation plants might be better at herbivory defense than assumed. The complexity of VOC responses to experimental warming, elevation, and herbivory are challenging our understanding and predictions of future VOC emissions from dwarf birch‐dominated ecosystems.

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Synergistic effects of insect herbivory and changing climate on plant volatile emissions in the subarctic tundra

Cited by 9 publications

References 64 publications

Heat stress affects potato's volatile emissions that mediate agronomically important trophic interactions

Heat stress affects potato's volatile emissions that mediate agronomically important trophic interactions

Herbivore-shrub interactions influence ecosystem respiration and BVOC composition in the subarctic

Volatile responses of dwarf birch to mimicked insect herbivory and experimental warming at two elevations in Greenlandic tundra

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