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See detailEffects of Plant Defense Signal Molecules Jasmonic Acid and Salicylic Acid on the Expression of Detoxification Enzyme Glutathione S-transferases and Salivary Protein C002 in Myzus persicae
ZHANG, Yong; FAN, Jia; ZHAO, XingYan et al

in SCIENTIA SINICA Vitae (2016), 46(5), 665-672

Jasmonic acid (JA) and salicylic acid (SA) are important phytohormones for activating plant defense responses when plants suffer from mechanical damage or pest infestation. In response to plant defense ... [more ▼]

Jasmonic acid (JA) and salicylic acid (SA) are important phytohormones for activating plant defense responses when plants suffer from mechanical damage or pest infestation. In response to plant defense responses, insects usually increase the detoxification enzyme activity or secrete some saliva proteins into plants to modulate host cell processes to promote their adaptation. In this study, we used real-time qPCR to detect the relative gene expression of detoxification enzyme named glutathione S-transferases (sigma GST) and salivary gland-specific protein C002 in Myzus persicae after feeding with 5mM JA or 10mM SA through artificial diet. The results showed that the relative expression of sigma GST and C002 in M. persicae increased significantly after JA and SA treatments. The results revealed that M. persicae can use JA and SA as cues to up-regulate gene expression of related detoxification enzyme and saliva protein. Our results provided new insights into the research on the mechanism of M. persicae adaptation to host plant resistance. [less ▲]

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See detailOrco mediates olfactory behaviors and winged morph differentiation induced by alarm pheromone in the grain aphid, Sitobion avenae
Fan, Jia; Zhang, Yong; Francis, Frédéric ULg et al

in Insect Biochemistry and Molecular Biology (2015), 64

Olfaction is crucial for short distance host location and pheromone detection by insects. Complexes of olfactory receptors (ORs) are composed of odor-specific ORs and OR co-receptors (Orco). Orcos are ... [more ▼]

Olfaction is crucial for short distance host location and pheromone detection by insects. Complexes of olfactory receptors (ORs) are composed of odor-specific ORs and OR co-receptors (Orco). Orcos are widely co-expressed with odor-specific ORs and are conserved across insect taxa. A number of Orco orthologs have been studied to date, although none has been identified in cereal aphids. In this study, an Orco gene ortholog was cloned from the grain aphid, Sitobion avenae, and named “SaveOrco”; RNA interference (RNAi) reduced the expression of SaveOrco to 34.11% in aphids, resulting in weaker EAG (electroantennogram) responses to plant volatiles (Z-3-hexene-1-ol; methyl salicylate, MeSA) and aphid alarm pheromone (E-b-farnesene, EBF). Aphid wing differentiation induced by EBF was investigated in both RNAi treated and untreated aphids. EBF induced production of winged aphids in both pre-natal and postnatal periods in untreated aphids, but no such induction was observed in the RNAi-treated aphids. We conclude that SaveOrco is crucial for the aphid's response to pheromones and other volatiles, and is involved in wing differentiation triggered by EBF [less ▲]

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See detailEffect of wheat plant volatiles on aphids and associated predator behavior: selection of efficient infochemicals for field study
XIE, Hai-Cui; Durieux, Delphine ULg; fan, Jia et al

in Chinese Journal of Applied Entomology (2014), 51(6), 1470-1478

Semiochemicals are involved in tritrophic interactions and affect the behaviors of both herbivores and beneficial insects. Many volatile molecules from the wheat plant [Triticum aestivum L. (Gramineae ... [more ▼]

Semiochemicals are involved in tritrophic interactions and affect the behaviors of both herbivores and beneficial insects. Many volatile molecules from the wheat plant [Triticum aestivum L. (Gramineae)] have previously been identified. To understand their effects on aphids and related auxiliaries. [Methods] The impact of four of these volatiles; methyl-salycilate, cis-3-hexenyl acetate, hexenol, and 1-hexanol, was tested on the wheat aphid [Sitobion avenae (Fabricus) (Homoptera: Aphididae)] and two major predators of this pest encountered in field crops, the hoverfly (Episyrphus balteatus (DeGeer) (Diptera: Syrphidae)] and the multicoloured Asian ladybird [Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae)]. Different doses of these chemicals were tested by performing four arm-olfactometer and wind-tunnel assays. [Results] The results show that methyl-salycilate seemed to be attractive only toward H. axyridis but 3-hexenyl acetate and hexenol were attractive to both S. avenae and H. axyridis. However, these positive responses decreased with increased dose of the tested compounds. 3-hexenyl acetate also induced positive response in E. balteatus but 1-hexanol was more attractive to aphids than to their natural enemies. [Conclusion] In conclusion, these results highlight the potential benefit of combining methyl-salycilate, 3-hexenyl acetate and hexenol in push and pull traps aimed to control S. avenae. Contrary to the three aforementioned compounds, 1-hexanol did not seem to have much potential as a semiochemical for the biological control of aphids. Key words wheat, volatiles, infochemicals, aphid, predator, behaviour [less ▲]

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See detailDo aphids and their predators use the same OBP to transport a same odour?
Vandermoten, Sophie ULg; Fan, Jia; Liu, Yong et al

Poster (2010, August)

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