Plant Volatiles Modulate Immune Responses of Spodoptera litura

Ghosh, Ekendranath; Venkatesan, Radhika

doi:10.1007/s10886-019-01091-3

Cited by 31 publications

(23 citation statements)

References 41 publications

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“…S. littoralis caterpillars can utilize host-derived indole emissions to reduce their suitability and attractiveness to parasitoids by changing the smell of caterpillars [47]. HIPVs such as (E)-β-ocimene can also improve immune functions of S. litura [48].…”

Section: Discussionmentioning

confidence: 99%

Exposure of Helicoverpa armigera Larvae to Plant Volatile Organic Compounds Induces Cytochrome P450 Monooxygenases and Enhances Larval Tolerance to the Insecticide Methomyl

Ding

Shi

et al. 2021

Insects

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Plants release an array of volatile chemicals into the air to communicate with other organisms in the environment. Insect attack triggers emission of herbivore-induced plant volatiles (HIPVs). How insect herbivores use these odors to plan their detoxification systems is vital for insect adaptation to environmental xenobiotics. Here we show that the larvae of Helicoverpa armigera (Hübner), a broadly polyphagous lepidopteran herbivore, have the capacity to use plant volatiles as cues to upregulate multiple detoxification systems, including cytochrome P450 monooxygenases (P450s), for detoxification of insecticides. Olfactory exposure of the fifth instars to two terpene volatiles limonene and nerolidol, and two green-leaf volatiles 2-heptanone and cis-3-hexenyl acetate significantly reduced larval susceptibility to the insecticide methomyl. However, larval pretreatment with piperonyl butoxide (PBO), a known P450 inhibitor, neutralized the effects of volatile exposure. Furthermore, larval exposure to the four plant volatiles enhanced activities of P450 enzymes in midguts and fatbodies, and upregulated expression of CYP6B2, CYP6B6 and CYP6B7, P450s involved in detoxification of the insecticide. Larval exposure to 2-heptanone and limonene volatiles also enhanced activities of glutathione-s-transferase and carboxylesterase. Our findings suggest that olfactory exposure to HIPVs enhances larval insecticide tolerance via induction of detoxification P450s.

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Section: Discussionmentioning

confidence: 99%

Exposure of Helicoverpa armigera Larvae to Plant Volatile Organic Compounds Induces Cytochrome P450 Monooxygenases and Enhances Larval Tolerance to the Insecticide Methomyl

Ding

Shi

et al. 2021

Insects

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“…In the face of significant top-down pressure, herbivorous insects may experience increased survival and performance on low-quality plants if the negative effect of natural enemies is lowered compared to highquality plants (enemy-free space; Diamond & Kingsolver, 2010;Jeffries & Lawton, 1984;Meijer et al, 2016;Mulatu et al, 2004;Murphy, 2004;Torres-Vila & Rodríguez-Molina, 2013;Vosteen et al, 2016). Conversely, plants can also alter an herbivore's physiological or immune response to enemies (Carper et al, 2019;Ghosh & Venkatesan, 2019;Singer et al, 2014;Smilanich, Dyer, Chambers, et al, 2009;Vogelweith, Dourneau, et al, 2013). Many insect herbivores rely on their immune systems for protection against parasitic enemies such as parasitoids (Carton et al, 2008), which are a significant source of insect mortality (Hawkins et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Diet‐mediated immune response to parasitoid attacks on a caterpillar with a broad diet breadth

Vyas

Murphy

2022

Ecological Entomology

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Bottom‐up (plant) and top‐down (natural enemy) trophic factors can interact to have significant influence on the diet breadth of herbivores. For herbivorous insects that are victim to parasitoid attacks, diet composition can modulate insect immune responses against the parasitoid. However, immune responses are costly and insect herbivores experience a trade‐off between investment in immune defences and other physiological processes. We used a split‐brood laboratory experiment to explore how the diet of the fall webworm (Hyphantria cunea), a species that eats over 400 plant species, affects larval growth and fitness and cellular immune response to attacks from a parasitic wasp. We reared larvae on four different plant diets (apple, alder, chokecherry, cottonwood) and then exposed them to an immune challenge from a parasitoid attack. We found that diet influenced larval development as well as parameters indicative of immune response. Larvae reared on the plant that led to the poorest development also had the fewest granulocytes and the highest odds of containing a parasitoid larva. However, larval growth was not a predictor of immune response. Overall, we show that the bottom‐up effect of diet variability has significant impacts on insect immune response such that larval fitness varies considerably when fed different dietary plant species. Broad diet ranges may offer herbivorous insects the opportunity to exploit a different set of resources depending on the severity of top‐down pressures. Here, we show that this variability in plant quality also has significant impacts on larval immune response.

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“…With regard to the dominant exclusive compounds of the floral profile, ( E )‐β‐ocimene ( 12 ), ( Z )‐β‐ocimene ( 11 ), allo ‐ocimene ( 16 ) and neo ‐ allo ‐ocimene ( 18 ) are considered common attractants for pollinators (Jayanthi et al, 2012; Steen et al, 2019). However, ( E )‐β‐ocimene ( 12 ) is also involved in tritrophic protective mechanisms (Ghosh & Venkatesan, 2019), together with myrcene ( 5 ), showing allelopathic defence functions (Hsiung et al, 2013). Referring to the common compounds, β‐pinene ( 3 ), β‐caryophyllene ( 31 ) and germacrene D ( 37 ) (Birkett et al, 2008; Zhang 2018; Abraham et al, 2018; Lobo et al, 2019), these may contribute to the overall defence action; moreover, an attractant role is also recognized to β‐caryophyllene ( 31 ) (Abraham et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

A novel study approach on Scutellaria altissima L. cultivated at the Ghirardi Botanic Garden (Lombardy, Italy)

et al. 2020

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Within an Open Science project, research was carried out to describe to the public of the Ghirardi Botanic Garden (BS, Lombardy, Italy) the invisible features of plants. This work is dedicated to Scutellaria altissima L. (Lamiaceae). Micromorphological, histochemical and phytochemical investigations were conducted on the vegetative and reproductive organs to correlate the structures involved in the emission of substances and their unique productivity. This work reports volatile organic compound (VOC) profiles of leaves and flowers and the composition of essential oil (EO) obtained from aerial parts of plants cultivated in Italy that have never been described before. Three morphotypes of glandular trichomes were observed: peltate, short‐stalked capitate and long‐stalked capitate. Peltate trichomes were the main producers of terpenes, short‐stalked capitates of polysaccharides and long‐stalked capitates of terpenes and polyphenols. The leaf VOC profile showed heterogeneous composition, with non‐terpene derivatives as the major chemical class (71.04%), while monoterpene hydrocarbons represented almost the totality of the flower (99.73%). The leaf presented a higher number of total (37 versus 11) and exclusive (33 versus 7) compounds. (Z)‐3‐Hexenol acetate was most abundant in the leaf and (E)‐β‐ocimene in the flower. Four common compounds were detected: β‐pinene, β‐caryophyllene, γ‐muurolene and germacrene‐D. The EO contaied 21 compounds, dominated by β‐caryophyllene, linalool and hexahydrofarnesyl acetone. This research allowed us to correlate morphotypes of the secretory structures with the production of secondary metabolites, with the aim of providing the public of the Ghirardi Botanic Garden with a dedicated iconographic approach, which accounts for olfactory perception linked to S. altissima.

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Plant Volatiles Modulate Immune Responses of Spodoptera litura

Cited by 31 publications

References 41 publications

Exposure of Helicoverpa armigera Larvae to Plant Volatile Organic Compounds Induces Cytochrome P450 Monooxygenases and Enhances Larval Tolerance to the Insecticide Methomyl

Exposure of Helicoverpa armigera Larvae to Plant Volatile Organic Compounds Induces Cytochrome P450 Monooxygenases and Enhances Larval Tolerance to the Insecticide Methomyl

Diet‐mediated immune response to parasitoid attacks on a caterpillar with a broad diet breadth

A novel study approach on Scutellaria altissima L. cultivated at the Ghirardi Botanic Garden (Lombardy, Italy)

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