Phytohormones in Fall Armyworm Saliva Modulate Defense Responses in Plants

Acevedo, Flor E.; Smith, Philip B.; Peiffer, Michelle; Helms, Anjel M.; Tooker, John F.; Felton, Gary W.

doi:10.1007/s10886-019-01079-z

Cited by 52 publications

(44 citation statements)

References 65 publications

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“…According to Bari and Jones (2009), exogenous applications of phytohormones modulate defense responses in plants, which results in hormonal imbalance and activation of inappropriate defense responses. Acevedo et al (2019) suggest that phytohormones present in the saliva of Spodoptera frugiperda could induce defense responses in plants. Besides, they observe the response induction in the activities of polyphenol oxidase (PPO), peroxidase activity (POX), and protease inhibitor activity (PI) when they treated tomato, corn and rice plants with a mixture of phytohormones.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…In fact, Acevedo et al (2019) and Saraiva et al (2020) also showed that non‐protein components from insect saliva modulated defense responses in different plant species, including elephant grass. For fall armyworm Spodoptera frugiperda , the phytohormones jasmonic acid (JA), salicylic acid (AS), and abscisic acid (ABA) were detected at concentrations of less than 5 ng per μl of saliva (Acevedo et al, 2019), while for Maharnava spectabilis , MeJA, AIA, and SA were observed at levels of approximately 5833 and 4000 ng per g of fresh glands, respectively (Saraiva et al, 2020). The amounts of phytohormones detected in salivary glands of M. Spectabilis (Saraiva et al, 2020) and from other insect tissues were higher than those found in their diets (P. Wu et al, 2019), suggesting that insects may be able to sequester these compounds selectively for re‐delivery to the plants.…”

Section: Discussionmentioning

confidence: 99%

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Protein and phytohormone profiles of Mahanarva spectabilis salivary glands infesting different forages

Monteiro¹,

Júnior²,

Vital³

et al. 2021

Arch Insect Biochem Physiol

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Given the importance of pastures for feeding cattle, the study of factors that affect their productivity is essential to get plant material of higher nutritional quality. Thus, the study of insect–plant interaction is important for the development of control strategies. Pasture spittlebugs affect forage grasses causing severe damage. We tested hormone and protein profiles differentially expressed in the salivary glands of Mahanarva spectabilis when fed with different pasture genotypes. The LC/MS approaches combined with bioinformatics tools were used to identify the mains biological processes in the salivary glands. The grouping revealed a greater number of proteins involved in biological processes of metabolic synthesis, biotic/abiotic stress, and ion transport across the membrane. The proteomic profiles were altered when insects were fed with different grasses. We also detected phytohormones in the salivary glands involved in the modulation of defense responses in host plants. These results allowed the analysis of important biological processes such as cell homeostasis, stress proteins, nucleic acid metabolism, regulation of muscle contraction, and transport and export of biomolecules. This represents an important advance in the understanding of the plant–pest interaction and can contribute to the choice of target elicitors, which allow effective strategies in the control of pasture spittlebugs.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Protein and phytohormone profiles of Mahanarva spectabilis salivary glands infesting different forages

Monteiro¹,

Júnior²,

Vital³

et al. 2021

Arch Insect Biochem Physiol

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“…In the first study to reveal the potency of caterpillar regurgitants to induce volatile emissions (Turlings et al, 1993), the regurgitant of S. frugiperda was indeed one of the least active. Recently, further evidence for the suppressing powers of S. frugiperda oral secretions were obtained by Acevedo et al (2017aAcevedo et al ( , 2018Acevedo et al ( , 2019. In the current study we investigated how this may affect HIPVs and their attractiveness to parasitoids.…”

Section: Introductionmentioning

confidence: 86%

Spodoptera frugiperda Caterpillars Suppress Herbivore-Induced Volatile Emissions in Maize

et al. 2020

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“…an effector), similar to the HARP1 protein first identified in cotton bollworm (Chen et al ., 2019). Proteomics and targeted metabolomics analyses of FAW saliva have revealed a list of potential plant defense-manipulating effectors including glucose oxidases and diverse phytohormones (Acevedo et al ., 2017; Acevedo et al ., 2019). Similarly, a maize-produced chitinase has been identified in the frass of FAW larvae, which could also suppress maize defense responses (Ray et al ., 2016).…”

Section: Introductionmentioning

confidence: 99%

The race goes on: A fall armyworm-resistant maize inbred line influences insect oral secretion elicitation activity and nullifies herbivore suppression of plant defense

Malook

Liu

et al. 2021

Preprint

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Fall armyworm (Spodoptera frugiperda) is an invasive lepidopteran pest with strong feeding preference towards maize (Zea mays). Its success on maize is facilitated by a suite of specialized detoxification and manipulation mechanisms that curtail host plant defense responses. In this study, we identified a Chinese maize inbred line Xi502 that was able to mount effective defense in response to fall armyworm attack. Comparative transcriptomics analyses, phytohormonal measurements, and targeted benzoxazinoid quantification consistently demonstrate significant inducible defense responses in Xi502, but not in the susceptible reference inbred line B73. In 24 hours, fall armyworm larvae feeding on B73 showed accelerated maturation-oriented transcriptomic responses and more changes in detoxification gene expression compared to their Xi502-fed sibling. Interestingly, oral secretions collected from larvae fed on B73 and Xi502 leaves demonstrated distinct elicitation activity when applied on either host genotypes, suggesting that variation in both insect oral secretion composition and host plant alleles could influence plant defense response. These results revealed host plant adaptation towards counter-defense mechanisms in a specialist insect herbivore, adding yet another layer to the evolutionary arms race between maize and fall armyworm. This could facilitate future investigation into the molecular mechanisms in this globally important crop-pest interaction system.

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Phytohormones in Fall Armyworm Saliva Modulate Defense Responses in Plants

Cited by 52 publications

References 65 publications

Protein and phytohormone profiles of Mahanarva spectabilis salivary glands infesting different forages

Protein and phytohormone profiles of Mahanarva spectabilis salivary glands infesting different forages

Spodoptera frugiperda Caterpillars Suppress Herbivore-Induced Volatile Emissions in Maize

The race goes on: A fall armyworm-resistant maize inbred line influences insect oral secretion elicitation activity and nullifies herbivore suppression of plant defense

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