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Behavior and development of Tetranychus ludeni Zacher, 1913 (Acari: Tetranychidae) and physiological stress in genetically modified cotton expressing Cry1F and Cry1Ac proteins
Behavior and development of Tetranychus ludeni Zacher, 1913 (Acari: Tetranychidae) and physiological stress in genetically modified cotton expressing Cry1F and Cry1Ac proteins
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Behavior and development of Tetranychus ludeni Zacher, 1913 (Acari: Tetranychidae) and physiological stress in genetically modified cotton expressing Cry1F and Cry1Ac proteins
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Behavior and development of Tetranychus ludeni Zacher, 1913 (Acari: Tetranychidae) and physiological stress in genetically modified cotton expressing Cry1F and Cry1Ac proteins
Behavior and development of Tetranychus ludeni Zacher, 1913 (Acari: Tetranychidae) and physiological stress in genetically modified cotton expressing Cry1F and Cry1Ac proteins

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Behavior and development of Tetranychus ludeni Zacher, 1913 (Acari: Tetranychidae) and physiological stress in genetically modified cotton expressing Cry1F and Cry1Ac proteins
Behavior and development of Tetranychus ludeni Zacher, 1913 (Acari: Tetranychidae) and physiological stress in genetically modified cotton expressing Cry1F and Cry1Ac proteins
Journal Article

Behavior and development of Tetranychus ludeni Zacher, 1913 (Acari: Tetranychidae) and physiological stress in genetically modified cotton expressing Cry1F and Cry1Ac proteins

2021
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Overview
Abstract Genetically modified plants are one of the tactics used in integrated pest management - IPM. There is great concern about the impact of these plants on non-target organisms. On the other hand, there is little information in the literature on the effects of transgenics (Bacillus thuringiensis) Bt on populations of phytophagous mites, and the physiological responses that this attack promotes on plants. The objective of this work was to evaluate the biology of the T. ludeni mite in Bt cotton, expressing the Cry1F and Cry1Ac proteins. To evaluate the behavior of food and oviposition preference of the T. ludeni with Bt cotton and isohybrid. Verify if the physiological stress caused by T. ludeni’s attack is differentiated in Bt cotton. The mites were reared in Bt cotton and isohybrid, in a total of 40 replicates in the completely randomized design and the biological cycle was evaluated. The food preference and oviposition analysis were done with 10 replicates, with choice. The physiological stress was evaluated through chlorophyll fluorescence, under greenhouse conditions. The data of the T. ludeni biology were analyzed by Student's t-test, for food and oviposition preference the chi-square test was performed. Regression models were fitted for the fluorescence parameters. The model identity test was used to evaluate the differences between Bt and isohybrid treatments. Cry1F and Cry1Ac proteins have not affected the biology of T. ludeni. The photosynthetic parameters in Bt cotton plants were less influenced by T. ludeni infestation. Resumo O uso de plantas geneticamente modificadas é uma das táticas utilizadas no manejo integrado de pragas - MIP. Observa-se grande preocupação com o impacto dessas plantas sobre organismos não alvos. Por outro lado, existe pouca informação na literatura sobre efeitos dos transgênicos (Bacillus thuringiensis) Bt em populações de ácaros fitófagos, e as respostas fisiológicas que esse ataque promove nas plantas. Objetivou-se com esse trabalho avaliar a biologia do ácaro T. ludeni em algodoeiro Bt, expressando as proteínas Cry1F e Cry1Ac. Avaliar se há comportamento de preferência alimentar e postura de T. ludeni em relação ao algodoeiro Bt e seu iso-híbrido. E verificar se o estresse fisiológico causado pelo ataque de T. ludeni é diferenciado em algodoeiro Bt. Os ácaros foram criados em algodoeiro Bt e iso-híbrido, em um total de 40 repetições no delineamento inteiramente casualizado, onde foi avaliado o ciclo biológico. A análise de preferência alimentar e de posturas foi feita com 10 repetições, com escolha. O estresse fisiológico foi avaliando através da fluorescência da clorofila, em casa de vegetação. Os dados da biologia de T. ludeni foram analisados pelo teste t Student, para preferência alimentar e postura foi realizado o teste qui-quadrado. Para os parâmetros da fluorescência, foram ajustados modelos de regressão. Para testar as diferenças entre Bt e iso-híbrido foi utilizado o teste de identidade de modelos. As proteínas Cry1F e Cry1Ac não afetaram a biologia de T. ludeni. Os parâmetros fotossintéticos em plantas de algodoeiro Bt foram menos influenciados pela infestação de T. ludeni.