Abstract:The mirid bug Apolygus lucorum, a dominant mirid species in northern China, is a notorious polyphagous pest with more than 200 hosts, including several major crops such as cotton and soybean, resulting in massive economic loss. Studies of insect salivary effectors may provide a novel control strategy for A. lucorum. An A. lucorum effector, that is, Al6, that inhibits plant immunity by using glutathione peroxidase to repress reactive oxidase accumulation was previously identified. In this study, we further expl… Show more
“…3c). We further investigated the feeding behavior of Al106 ‐silenced insects using an EPG technique and the three waveforms, nonprobing (NP), cell rupture (CR), and ingestion (I), were characterized according to a previous study (Dong et al ., 2023). After silencing Al106 gene, A. lucorum insects showed prolonged NP stage and shorter I phase (Fig.…”
Summary
Apolygus lucorum (Meyer‐Dur; Heteroptera: Miridae) is a major agricultural pest infesting crops, vegetables, and fruit trees. During feeding, A. lucorum secretes a plethora of effectors into its hosts to promote infestation. However, the molecular mechanisms of these effectors manipulating plant immunity are largely unknown.
Here, we investigated the molecular mechanism underlying the effector Al106 manipulation of plant–insect interaction by RNA interference, electrical penetration graph, insect and pathogen bioassays, protein–protein interaction studies, and protein ubiquitination experiment.
Expression of Al106 in Nicotiana benthamiana inhibits pathogen‐associated molecular pattern‐induced cell death and reactive oxygen species burst, and promotes insect feeding and plant pathogen infection. In addition, peptidyl‐prolyl cis‐trans isomerase (PPIase) activity of Al106 is required for its function to inhibit PTI.Al106 interacts with a plant U‐box (PUB) protein, PUB33, from N. benthamiana and Arabidopsis thaliana. We also demonstrated that PUB33 is a positive regulator of plant immunity. Furthermore, an in vivo assay revealed that Al106 inhibits ubiquitination of NbPUB33 depending on PPIase activity.
Our findings revealed that a novel cyclophilin effector may interact with plant PUB33 to suppress plant immunity and facilitate insect feeding in a PPIase activity‐dependent manner.
“…3c). We further investigated the feeding behavior of Al106 ‐silenced insects using an EPG technique and the three waveforms, nonprobing (NP), cell rupture (CR), and ingestion (I), were characterized according to a previous study (Dong et al ., 2023). After silencing Al106 gene, A. lucorum insects showed prolonged NP stage and shorter I phase (Fig.…”
Summary
Apolygus lucorum (Meyer‐Dur; Heteroptera: Miridae) is a major agricultural pest infesting crops, vegetables, and fruit trees. During feeding, A. lucorum secretes a plethora of effectors into its hosts to promote infestation. However, the molecular mechanisms of these effectors manipulating plant immunity are largely unknown.
Here, we investigated the molecular mechanism underlying the effector Al106 manipulation of plant–insect interaction by RNA interference, electrical penetration graph, insect and pathogen bioassays, protein–protein interaction studies, and protein ubiquitination experiment.
Expression of Al106 in Nicotiana benthamiana inhibits pathogen‐associated molecular pattern‐induced cell death and reactive oxygen species burst, and promotes insect feeding and plant pathogen infection. In addition, peptidyl‐prolyl cis‐trans isomerase (PPIase) activity of Al106 is required for its function to inhibit PTI.Al106 interacts with a plant U‐box (PUB) protein, PUB33, from N. benthamiana and Arabidopsis thaliana. We also demonstrated that PUB33 is a positive regulator of plant immunity. Furthermore, an in vivo assay revealed that Al106 inhibits ubiquitination of NbPUB33 depending on PPIase activity.
Our findings revealed that a novel cyclophilin effector may interact with plant PUB33 to suppress plant immunity and facilitate insect feeding in a PPIase activity‐dependent manner.
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