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Gary W Felton - One of the best experts on this subject based on the ideXlab platform.
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Symbiotic polydnavirus of a parasite manipulates Caterpillar and plant immunity.
Proceedings of the National Academy of Sciences of the United States of America, 2018Co-Authors: Ching-wen Tan, Flor E Acevedo, Michelle Peiffer, Kelli Hoover, Cristina Rosa, Gary W FeltonAbstract:Obligate symbioses occur when organisms require symbiotic relationships to survive. Some parasitic wasps of Caterpillars possess obligate mutualistic viruses called "polydnaviruses." Along with eggs, wasps inject polydnavirus inside their Caterpillar hosts where the hatching larvae develop inside the Caterpillar. Polydnaviruses suppress the immune systems of their Caterpillar hosts, which enables egg hatch and wasp larval development. It is unknown whether polydnaviruses also manipulate the salivary proteins of the Caterpillar, which may affect the elicitation of plant defenses during feeding by the Caterpillar. Here, we show that a polydnavirus of the parasitoid Microplitis croceipes, and not the parasitoid larva itself, drives the regulation of salivary enzymes of the Caterpillar Helicoverpa zea that are known to elicit tomato plant-defense responses to herbivores. The polydnavirus suppresses glucose oxidase, which is a primary plant-defense elicitor in the saliva of the H. zea Caterpillar. By suppressing plant defenses, the polydnavirus allows the Caterpillar to grow at a faster rate, thus improving the host suitability for the parasitoid. Remarkably, polydnaviruses manipulate the phenotypes of the wasp, Caterpillar, and host plant, demonstrating that polydnaviruses play far more prominent roles in shaping plant-herbivore interactions than ever considered.
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herbivore cues from the fall armyworm spodoptera frugiperda larvae trigger direct defenses in maize
Molecular Plant-microbe Interactions, 2014Co-Authors: Wenpo Chuang, Flor E Acevedo, Michelle Peiffer, Gary W Felton, Douglas S LutheAbstract:In addition to feeding damage, herbivores release cues that are recognized by plants to elicit defenses. Caterpillar oral secretions have been shown to trigger herbivore defense responses in several different plant species. In this study, the effects of two fall armyworm (Spodoptera frugiperda) oral secretions (saliva and regurgitant) on Caterpillar defense responses in maize (Zea mays) were examined. Only minute amounts of regurgitant were deposited on the maize leaf during larval feeding bouts and its application to leaves failed to induce the expression of several herbivore defense genes. On the other hand, Caterpillars consistently deposited saliva on leaves during feeding and the expression of several maize defense genes significantly increased in response to saliva application and larval feeding. However, feeding by ablated Caterpillars with impaired salivation did not induce these defenses. Furthermore, bioassays indicated that feeding by unablated Caterpillars significantly enhanced defenses when ...
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herbivore cues from the fall armyworm spodoptera frugiperda larvae trigger direct defenses in maize
Molecular Plant-microbe Interactions, 2014Co-Authors: Wenpo Chuang, Flor E Acevedo, Michelle Peiffer, Gary W Felton, Swayamjit Ray, Dawn S. LutheAbstract:In addition to feeding damage, herbivores release cues that are recognized by plants to elicit defenses. Caterpillar oral secretions have been shown to trigger herbivore defense responses in several different plant species. In this study, the effects of two fall armyworm (Spodoptera frugiperda) oral secretions (saliva and regurgitant) on Caterpillar defense responses in maize (Zea mays) were examined. Only minute amounts of regurgitant were deposited on the maize leaf during larval feeding bouts and its application to leaves failed to induce the expression of several herbivore defense genes. On the other hand, Caterpillars consistently deposited saliva on leaves during feeding and the expression of several maize defense genes significantly increased in response to saliva application and larval feeding. However, feeding by ablated Caterpillars with impaired salivation did not induce these defenses. Furthermore, bioassays indicated that feeding by unablated Caterpillars significantly enhanced defenses when compared with that of ablated Caterpillars. Another critical finding was that the maize genotype and stage of development affected the expression of defense genes in response to wounding and regurgitant treatments. These results demonstrate that fall armyworm saliva contains elicitors that trigger herbivore defenses in maize.
Michelle Peiffer - One of the best experts on this subject based on the ideXlab platform.
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Symbiotic polydnavirus of a parasite manipulates Caterpillar and plant immunity.
Proceedings of the National Academy of Sciences of the United States of America, 2018Co-Authors: Ching-wen Tan, Flor E Acevedo, Michelle Peiffer, Kelli Hoover, Cristina Rosa, Gary W FeltonAbstract:Obligate symbioses occur when organisms require symbiotic relationships to survive. Some parasitic wasps of Caterpillars possess obligate mutualistic viruses called "polydnaviruses." Along with eggs, wasps inject polydnavirus inside their Caterpillar hosts where the hatching larvae develop inside the Caterpillar. Polydnaviruses suppress the immune systems of their Caterpillar hosts, which enables egg hatch and wasp larval development. It is unknown whether polydnaviruses also manipulate the salivary proteins of the Caterpillar, which may affect the elicitation of plant defenses during feeding by the Caterpillar. Here, we show that a polydnavirus of the parasitoid Microplitis croceipes, and not the parasitoid larva itself, drives the regulation of salivary enzymes of the Caterpillar Helicoverpa zea that are known to elicit tomato plant-defense responses to herbivores. The polydnavirus suppresses glucose oxidase, which is a primary plant-defense elicitor in the saliva of the H. zea Caterpillar. By suppressing plant defenses, the polydnavirus allows the Caterpillar to grow at a faster rate, thus improving the host suitability for the parasitoid. Remarkably, polydnaviruses manipulate the phenotypes of the wasp, Caterpillar, and host plant, demonstrating that polydnaviruses play far more prominent roles in shaping plant-herbivore interactions than ever considered.
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herbivore cues from the fall armyworm spodoptera frugiperda larvae trigger direct defenses in maize
Molecular Plant-microbe Interactions, 2014Co-Authors: Wenpo Chuang, Flor E Acevedo, Michelle Peiffer, Gary W Felton, Douglas S LutheAbstract:In addition to feeding damage, herbivores release cues that are recognized by plants to elicit defenses. Caterpillar oral secretions have been shown to trigger herbivore defense responses in several different plant species. In this study, the effects of two fall armyworm (Spodoptera frugiperda) oral secretions (saliva and regurgitant) on Caterpillar defense responses in maize (Zea mays) were examined. Only minute amounts of regurgitant were deposited on the maize leaf during larval feeding bouts and its application to leaves failed to induce the expression of several herbivore defense genes. On the other hand, Caterpillars consistently deposited saliva on leaves during feeding and the expression of several maize defense genes significantly increased in response to saliva application and larval feeding. However, feeding by ablated Caterpillars with impaired salivation did not induce these defenses. Furthermore, bioassays indicated that feeding by unablated Caterpillars significantly enhanced defenses when ...
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herbivore cues from the fall armyworm spodoptera frugiperda larvae trigger direct defenses in maize
Molecular Plant-microbe Interactions, 2014Co-Authors: Wenpo Chuang, Flor E Acevedo, Michelle Peiffer, Gary W Felton, Swayamjit Ray, Dawn S. LutheAbstract:In addition to feeding damage, herbivores release cues that are recognized by plants to elicit defenses. Caterpillar oral secretions have been shown to trigger herbivore defense responses in several different plant species. In this study, the effects of two fall armyworm (Spodoptera frugiperda) oral secretions (saliva and regurgitant) on Caterpillar defense responses in maize (Zea mays) were examined. Only minute amounts of regurgitant were deposited on the maize leaf during larval feeding bouts and its application to leaves failed to induce the expression of several herbivore defense genes. On the other hand, Caterpillars consistently deposited saliva on leaves during feeding and the expression of several maize defense genes significantly increased in response to saliva application and larval feeding. However, feeding by ablated Caterpillars with impaired salivation did not induce these defenses. Furthermore, bioassays indicated that feeding by unablated Caterpillars significantly enhanced defenses when compared with that of ablated Caterpillars. Another critical finding was that the maize genotype and stage of development affected the expression of defense genes in response to wounding and regurgitant treatments. These results demonstrate that fall armyworm saliva contains elicitors that trigger herbivore defenses in maize.
Flor E Acevedo - One of the best experts on this subject based on the ideXlab platform.
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Symbiotic polydnavirus of a parasite manipulates Caterpillar and plant immunity.
Proceedings of the National Academy of Sciences of the United States of America, 2018Co-Authors: Ching-wen Tan, Flor E Acevedo, Michelle Peiffer, Kelli Hoover, Cristina Rosa, Gary W FeltonAbstract:Obligate symbioses occur when organisms require symbiotic relationships to survive. Some parasitic wasps of Caterpillars possess obligate mutualistic viruses called "polydnaviruses." Along with eggs, wasps inject polydnavirus inside their Caterpillar hosts where the hatching larvae develop inside the Caterpillar. Polydnaviruses suppress the immune systems of their Caterpillar hosts, which enables egg hatch and wasp larval development. It is unknown whether polydnaviruses also manipulate the salivary proteins of the Caterpillar, which may affect the elicitation of plant defenses during feeding by the Caterpillar. Here, we show that a polydnavirus of the parasitoid Microplitis croceipes, and not the parasitoid larva itself, drives the regulation of salivary enzymes of the Caterpillar Helicoverpa zea that are known to elicit tomato plant-defense responses to herbivores. The polydnavirus suppresses glucose oxidase, which is a primary plant-defense elicitor in the saliva of the H. zea Caterpillar. By suppressing plant defenses, the polydnavirus allows the Caterpillar to grow at a faster rate, thus improving the host suitability for the parasitoid. Remarkably, polydnaviruses manipulate the phenotypes of the wasp, Caterpillar, and host plant, demonstrating that polydnaviruses play far more prominent roles in shaping plant-herbivore interactions than ever considered.
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herbivore cues from the fall armyworm spodoptera frugiperda larvae trigger direct defenses in maize
Molecular Plant-microbe Interactions, 2014Co-Authors: Wenpo Chuang, Flor E Acevedo, Michelle Peiffer, Gary W Felton, Douglas S LutheAbstract:In addition to feeding damage, herbivores release cues that are recognized by plants to elicit defenses. Caterpillar oral secretions have been shown to trigger herbivore defense responses in several different plant species. In this study, the effects of two fall armyworm (Spodoptera frugiperda) oral secretions (saliva and regurgitant) on Caterpillar defense responses in maize (Zea mays) were examined. Only minute amounts of regurgitant were deposited on the maize leaf during larval feeding bouts and its application to leaves failed to induce the expression of several herbivore defense genes. On the other hand, Caterpillars consistently deposited saliva on leaves during feeding and the expression of several maize defense genes significantly increased in response to saliva application and larval feeding. However, feeding by ablated Caterpillars with impaired salivation did not induce these defenses. Furthermore, bioassays indicated that feeding by unablated Caterpillars significantly enhanced defenses when ...
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herbivore cues from the fall armyworm spodoptera frugiperda larvae trigger direct defenses in maize
Molecular Plant-microbe Interactions, 2014Co-Authors: Wenpo Chuang, Flor E Acevedo, Michelle Peiffer, Gary W Felton, Swayamjit Ray, Dawn S. LutheAbstract:In addition to feeding damage, herbivores release cues that are recognized by plants to elicit defenses. Caterpillar oral secretions have been shown to trigger herbivore defense responses in several different plant species. In this study, the effects of two fall armyworm (Spodoptera frugiperda) oral secretions (saliva and regurgitant) on Caterpillar defense responses in maize (Zea mays) were examined. Only minute amounts of regurgitant were deposited on the maize leaf during larval feeding bouts and its application to leaves failed to induce the expression of several herbivore defense genes. On the other hand, Caterpillars consistently deposited saliva on leaves during feeding and the expression of several maize defense genes significantly increased in response to saliva application and larval feeding. However, feeding by ablated Caterpillars with impaired salivation did not induce these defenses. Furthermore, bioassays indicated that feeding by unablated Caterpillars significantly enhanced defenses when compared with that of ablated Caterpillars. Another critical finding was that the maize genotype and stage of development affected the expression of defense genes in response to wounding and regurgitant treatments. These results demonstrate that fall armyworm saliva contains elicitors that trigger herbivore defenses in maize.
Dawn S. Luthe - One of the best experts on this subject based on the ideXlab platform.
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herbivore cues from the fall armyworm spodoptera frugiperda larvae trigger direct defenses in maize
Molecular Plant-microbe Interactions, 2014Co-Authors: Wenpo Chuang, Flor E Acevedo, Michelle Peiffer, Gary W Felton, Swayamjit Ray, Dawn S. LutheAbstract:In addition to feeding damage, herbivores release cues that are recognized by plants to elicit defenses. Caterpillar oral secretions have been shown to trigger herbivore defense responses in several different plant species. In this study, the effects of two fall armyworm (Spodoptera frugiperda) oral secretions (saliva and regurgitant) on Caterpillar defense responses in maize (Zea mays) were examined. Only minute amounts of regurgitant were deposited on the maize leaf during larval feeding bouts and its application to leaves failed to induce the expression of several herbivore defense genes. On the other hand, Caterpillars consistently deposited saliva on leaves during feeding and the expression of several maize defense genes significantly increased in response to saliva application and larval feeding. However, feeding by ablated Caterpillars with impaired salivation did not induce these defenses. Furthermore, bioassays indicated that feeding by unablated Caterpillars significantly enhanced defenses when compared with that of ablated Caterpillars. Another critical finding was that the maize genotype and stage of development affected the expression of defense genes in response to wounding and regurgitant treatments. These results demonstrate that fall armyworm saliva contains elicitors that trigger herbivore defenses in maize.
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Insect feeding mobilizes a unique plant defense protease that disrupts the peritrophic matrix of Caterpillars
Proceedings of the National Academy of Sciences of the United States of America, 2002Co-Authors: Tibor Pechan, Allen Carson Cohen, W. Paul Williams, Dawn S. LutheAbstract:Plants frequently respond to herbivorous insect attack by synthesizing defense proteins that deter insect feeding and prevent additional herbivory. Maize (Zea mays L.) lines, resistant to feeding by a number of lepidopteran species, rapidly mobilize a unique 33-kDa cysteine protease in response to Caterpillar feeding. The accumulation of the 33-kDa cysteine protease in the maize mid-whorl was correlated with a significant reduction in Caterpillar growth that resulted from impaired nutrient utilization. Black Mexican Sweetcorn callus transformed with mir1, the gene encoding the 33-kDa cysteine protease, expressed the protease and growth of Caterpillars reared on the transgenic callus was reduced 60–80%. Scanning electron microscopy was used to examine the effect of plant material expressing the 33-kDa cysteine protease on the structure of the Caterpillar peritrophic matrix. Because the peritrophic matrix surrounds the food bolus, assists in digestive processes, and protects the Caterpillar midgut from physical and chemical damage, disruption of peritrophic matrix may reduce Caterpillar growth. The results indicated that the peritrophic matrix was severely damaged when Caterpillars fed on resistant maize plants or transgenic Black Mexican Sweetcorn. The accumulation of the 33-kDa cysteine protease in response to Caterpillar feeding, and its ability to damage the insect peritrophic matrix, represents an unusual host–plant resistance mechanism that may have applications in agricultural biotechnology.
Wenpo Chuang - One of the best experts on this subject based on the ideXlab platform.
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herbivore cues from the fall armyworm spodoptera frugiperda larvae trigger direct defenses in maize
Molecular Plant-microbe Interactions, 2014Co-Authors: Wenpo Chuang, Flor E Acevedo, Michelle Peiffer, Gary W Felton, Douglas S LutheAbstract:In addition to feeding damage, herbivores release cues that are recognized by plants to elicit defenses. Caterpillar oral secretions have been shown to trigger herbivore defense responses in several different plant species. In this study, the effects of two fall armyworm (Spodoptera frugiperda) oral secretions (saliva and regurgitant) on Caterpillar defense responses in maize (Zea mays) were examined. Only minute amounts of regurgitant were deposited on the maize leaf during larval feeding bouts and its application to leaves failed to induce the expression of several herbivore defense genes. On the other hand, Caterpillars consistently deposited saliva on leaves during feeding and the expression of several maize defense genes significantly increased in response to saliva application and larval feeding. However, feeding by ablated Caterpillars with impaired salivation did not induce these defenses. Furthermore, bioassays indicated that feeding by unablated Caterpillars significantly enhanced defenses when ...
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herbivore cues from the fall armyworm spodoptera frugiperda larvae trigger direct defenses in maize
Molecular Plant-microbe Interactions, 2014Co-Authors: Wenpo Chuang, Flor E Acevedo, Michelle Peiffer, Gary W Felton, Swayamjit Ray, Dawn S. LutheAbstract:In addition to feeding damage, herbivores release cues that are recognized by plants to elicit defenses. Caterpillar oral secretions have been shown to trigger herbivore defense responses in several different plant species. In this study, the effects of two fall armyworm (Spodoptera frugiperda) oral secretions (saliva and regurgitant) on Caterpillar defense responses in maize (Zea mays) were examined. Only minute amounts of regurgitant were deposited on the maize leaf during larval feeding bouts and its application to leaves failed to induce the expression of several herbivore defense genes. On the other hand, Caterpillars consistently deposited saliva on leaves during feeding and the expression of several maize defense genes significantly increased in response to saliva application and larval feeding. However, feeding by ablated Caterpillars with impaired salivation did not induce these defenses. Furthermore, bioassays indicated that feeding by unablated Caterpillars significantly enhanced defenses when compared with that of ablated Caterpillars. Another critical finding was that the maize genotype and stage of development affected the expression of defense genes in response to wounding and regurgitant treatments. These results demonstrate that fall armyworm saliva contains elicitors that trigger herbivore defenses in maize.
