Reduced Mythimna separata infestation on Bt corn could benefit aphids
| Autor: | Jörg Romeis, Hongxia Hua, Yunhe Li, Lei Zhang, Yufa Peng, Li-Xiao Du, Xiang-Wen Li |
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| Rok vydání: | 2020 |
| Předmět: |
Crops
Agricultural Genetically modified crops Moths Biology medicine.disease_cause Zea mays General Biochemistry Genetics and Molecular Biology Hemolysin Proteins Mythimna separata Bacterial Proteins Bacillus thuringiensis parasitic diseases Infestation medicine Animals Herbivory Pest Control Biological Caterpillar Ecology Evolution Behavior and Systematics Aphid Genetically modified maize Bacillus thuringiensis Toxins fungi Rhopalosiphum maidis food and beverages Plants Genetically Modified biology.organism_classification Endotoxins Agronomy Aphids Insect Science Agronomy and Crop Science |
| Zdroj: | Insect Science. 28:1139-1146 |
| ISSN: | 1744-7917 1672-9609 |
| Popis: | Use of genetically engineered plants that express insecticidal Cry proteins derived from Bacillus thuringiensis (Bt) have been proven efficacious for managing lepidopteran pests. However, in some cases herbivores that are not targeted by the Bt trait have increased in importance. It has been suggested that reduced caterpillar damage to Bt crops could lead to decreased levels of induced plant defensive compounds which might benefit other non-target herbivores. Here we investigated the potential effect of reduced damage by larvae of Mythimna separata on aphid populations in Bt corn. We compared the performance of Rhopalosiphum maidis feeding on non-Bt corn plants that had been infested by M. separata larvae or were uninfested. The results showed that caterpillar-infested corn plants significantly reduced the fitness of R. maidis leading to a prolonged nymphal development time, reduced adult longevity and fecundity compared to uninfested plants. Consequently, the population growth rate of corn aphids feeding on caterpillar-infested corn plants was significantly lower than on uninfested plants. As expected, the aphids performed significantly better on Lepidoptera-resistant Bt corn than on non-Bt corn when plants were infested with M. separata, since the caterpillars caused very little damage to the Bt plants. The current findings indicate that reduced M. separata infestation could benefit aphid development in Bt corn. Bt corn has the potential to be commercialized in China in the near future and aphids and other non-target pests should be monitored in the farming fields. |
| Databáze: | OpenAIRE |
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