What signals do herbivore-induced plant volatiles provide conspecific herbivores?

Subhash, S.; Jayanthi, P. D. Kamala; Kempraj, Vivek; Anjinappa, Raghavendra; Chakravarty, Akshay Kumar

doi:10.1007/s11829-017-9536-2

Cited by 16 publications

(12 citation statements)

References 48 publications

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“…Herbivores primarily locate their hosts through a wide range of volatile organic compounds (VOCs) produced by plants (Bruce et al ., 2005; Najar‐Rodriguez et al ., 2010; Giron et al ., 2018). Studies have revealed that subtle changes in the composition of VOCs can easily confuse herbivores, thereby altering their host preference (Bruce et al ., 2005; Shivaramu et al ., 2017). The emission of VOCs from plants varies extensively with their phenological stage and also the abiotic/biotic stresses they are under (Holopainen & Gershenzon, 2010; Shivaramu et al ., 2017).…”

Section: Introductionmentioning

confidence: 99%

Low moisture stress influences plant volatile emissions affecting herbivore interactions in tomato, Solanum lycopersicum

Jayanthi

Gadad

Parepally

et al. 2021

Ecological Entomology

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1. Frequently changing climatic conditions can cause recurring droughts which often subject plants to tremendous amounts of stress, leaving biologists to wonder about its impact on the associated herbivores and their interactions with host plants. 2. The present study was aimed at assessing the impact of low moisture stress on herbivore‐plant interactions using tomato and its associated herbivores (leaf miner, Tuta absoluta and sap feeder, Bemisia tabaci). 3. The leaf miner T. absoluta preferred tomato plants exposed to moderate drought stress compared to severely drought stressed or healthy plants while the sap feeder B. tabaci preferred healthy tomato plants that were irrigated regularly over others. Our study uncovers few intriguing aspects of low moisture stress on herbivore‐host interactions and also highlights that this influence may vary depending upon the herbivore feeding guild. 4. The volatile profiles of tomato plants were found to differ significantly when subjected to varied degrees of low moisture stress. Such changes in plant's volatile emissions may in turn alter its associated herbivore's behavioural perspective as observed in T. absoluta and B. tabaci. 5. Reduced amounts of caryophyllene, humulene, 3‐carene, myristic acid, and γ‐butyl‐γ‐butyrolactone might be what aids T. absoluta and B. tabaci in gauging the drought stress status of a host plant. Further, the presence of chemical cues such as α‐pinene, m‐cymene, and ethyl benzaldehyde might signal T. absoluta moths of severely stressed plants. Similarly, the presence of undecane, ethyl benzaldehyde, n‐hexadecanoic acid might aid whiteflies in identifying plants reeling under low moisture stress.

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Section: Introductionmentioning

confidence: 99%

Low moisture stress influences plant volatile emissions affecting herbivore interactions in tomato, Solanum lycopersicum

Jayanthi

Gadad

Parepally

et al. 2021

Ecological Entomology

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“…Many well-known defense systems have evolved to combat insect attack (Akello and Sikora 2012;Allegrucci et al 2018). This process mainly involves antifeedant or toxic compounds that inhibit insect performance (McCormick et al 2016), even emission of volatiles that attract natural enemies (Shivaramu et al 2017). Especially the induced volatile organic compounds (VOCs) after fungal colonization (Sun et al 2016) are crucially important.…”

Section: Introductionmentioning

confidence: 99%

Endophytic colonization by Beauveria bassiana increases the resistance of tomatoes against Bemisia tabaci

Wei

et al. 2020

Arthropod-Plant Interactions

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Beauveria bassiana, an entomopathogenic fungus, can exist asymptomatically as an endophyte in many plants. This study aimed to determine the efficiency of B. bassiana colonization of tomato plants using different inoculation methods, and how colonization of the host plant affects the key pest of tomato, the whitefly Bemisia tabaci. To confirm fungal colonization efficiency, nested PCR technique was used to detect B. bassiana sequences in Solanum lycopersicum. Distribution of the fungus within the plant parts was determined by selective medium. Tomato growth parameters were determined with plants that had been inoculated using direct spraying or irrigation of the rhizosphere. B. tabaci performance assays were carried out in a cage, and preference to treatments was determined using Y-tube olfactometer studies. Results show that B. bassiana can effectively colonize tomato, with colonization rate using leaf spraying reaching 100% within 14 days. Fungal presence was not uniformly distributed among plant parts, but was biased towards the inoculation sites. For inoculation, conidial suspension sprayed at 1 × 10 8 conidia/ml resulted in the highest number of isolated colonies in leaf tissue, 8.5 ± 2.02 colonies per 2 g of fresh tissue (F 4,19 = 2.779, P = 0.045), and reached the lowest with root treatment. Although only small differences were observed among the growth indicators, leaf spray inoculation resulted in a significant positive influence on plant growth (PC1 55.7% contributions scores = 2.645) in further Principal component analysis. As for the feeding selectivity, B. tabaci preferred uninoculated plants. In Y-tube olfactometer assay, 80.5% of adults selected uninoculated plants. These findings add to the understanding of the interactions between B. bassiana and plants and indicate the potential of expanding the use of entomopathogenic fungi for crop protection.

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“…For example, the terpenoid capsidiol plays a role in induced defenses against pathogens (Lee et al 2017 ). Volatiles emitted by C. annuum plants can attract the Chilli thrips Scirtothrips dorsalis (Shivaramu et al 2017 ). High levels of tocopherols and low levels of aromatic amino acids in leaves of Capsicum have been related to thrips resistance (Maharijaya et al 2012 ; Mollema and Cole 1996 ).…”

Section: Introductionmentioning

confidence: 99%

Metabolomics of Thrips Resistance in Pepper (Capsicum spp.) Reveals Monomer and Dimer Acyclic Diterpene Glycosides as Potential Chemical Defenses

et al. 2019

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The development of pesticide resistance in insects and recent bans on pesticides call for the identification of natural sources of resistance in crops. Here, we used natural variation in pepper ( Capsicum spp.) resistance combined with an untargeted metabolomics approach to detect secondary metabolites related to thrips ( Frankliniella occidentalis ) resistance. Using leaf disc choice assays, we tested 11 Capsicum accessions of C. annuum and C. chinense in both vegetative and flowering stages for thrips resistance. Metabolites in the leaves of these 11 accessions were analyzed using LC-MS based untargeted metabolomics. The choice assays showed significant differences among the accessions in thrips feeding damage. The level of resistance depended on plant developmental stage. Metabolomics analyses showed differences in metabolomes among the Capsicum species and plant developmental stages. Moreover, metabolomic profiles of resistant and susceptible accessions differed. Monomer and dimer acyclic diterpene glycosides (capsianosides) were pinpointed as metabolites that were related to thrips resistance. Sucrose and malonylated flavone glycosides were related to susceptibility. To our knowledge, this is the first time that dimer capsianosides of pepper have been linked to insect resistance. Our results show the potential of untargeted metabolomics as a tool for discovering metabolites that are important in plant – insect interactions. Electronic supplementary material The online version of this article (10.1007/s10886-019-01074-4) contains supplementary material, which is available to authorized users.

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What signals do herbivore-induced plant volatiles provide conspecific herbivores?

Cited by 16 publications

References 48 publications

Low moisture stress influences plant volatile emissions affecting herbivore interactions in tomato, Solanum lycopersicum

Low moisture stress influences plant volatile emissions affecting herbivore interactions in tomato, Solanum lycopersicum

Endophytic colonization by Beauveria bassiana increases the resistance of tomatoes against Bemisia tabaci

Metabolomics of Thrips Resistance in Pepper (Capsicum spp.) Reveals Monomer and Dimer Acyclic Diterpene Glycosides as Potential Chemical Defenses

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