Efeitos de proteinas Cry e vip nos parâmetros biológicos de populações de Spodoptera frugiperda (Smith, 1797) e injúrias nas plantas de milho por Lepidópteros
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Data
2017-01-31
Autores
Crosariol Netto, Jacob [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
A lagarta do cartucho Spodoptera frugiperda é a principal praga da cultura do milho nas regiões tropicais e subtropicais do continente americano. Dentre os métodos mais utilizados para o controle desta praga no Brasil, destaca-se o uso de plantas geneticamente modificadas a partir da inserção de um gene da bactéria Bacillus thuringiensis que confere a planta a expressão de proteínas com ações inseticidas. No entanto, durante dois ou três anos estas tecnologias reduziram o grau de supressão às lagartas, principalmente pelo uso continuo e inadequado da tecnologia. O objetivo deste trabalho foi estudar em condições de campo, o comportamento de híbridos de milho Bt frente ao ataque de lepidópteros, como a S. frugiperda e Helicoverpa zea, em quatro regiões produtoras de milho do estado de São Paulo, bem como estudar em condições de laboratório a biologia comparada de populações de S. frugiperda coletadas nestas regiões. Os experimentos de campo foram realizados no período da segunda safra de milho, no ano de 2014, nas regiões do Médio Paranapanema, Centro Norte, Noroeste e Norte do estado de São Paulo, onde foram utilizados 25 cultivares de milho com expressão de diferentes proteínas inseticidas. Para o estudo de biologia comparada foi realizada a coleta de lagartas nas quatro regiões do estado, as lagartas foram enviadas ao laboratório de Manejo Integrado de Pragas da FCAV-Unesp onde foram realizados os experimentos com folhas de híbridos de milho de diferentes tecnologias. Os resultados dos experimentos realizados a campo demonstram que a proteína inseticida VIP3Aa20 apresenta alto nível de supressão sobre as populações de S. frugiperda e Helicoverpa zea, além disso, os híbridos de milho que expressam a proteína inseticida Cry1F foram os mais suscetíveis frente ao ataque destas duas pragas. Através dos resultados obtidos para os experimentos de biologia comparada, constatou-se que a proteína inseticida VIP3Aa20 proporcionou 100% de mortalidade das lagartas oriundas das quatro regiões. O híbrido com expressão das proteínas Cry1A.105 + Cry2Ab2 + Cry1F foi o que proporcionou menor viabilidade de lagartas de S. frugiperda oriundas das quatro regiões do estado. O híbrido que expressa a proteína inseticida Cry1F proporcionou baixos níveis de supressão além de baixos efeitos adversos no desenvolvimento de S. frugiperda oriundas das quatro regiões do estado, indicando que as populações presentes nestas quatro regiões se encontram resistentes a ação desta proteína inseticida.
The fall armyworm Spodoptera frugiperda is the major pest of corn in tropical and subtropical regions in the American Continent. Among the most used methods to control this pest in Brazil, it highlights the use of genetically modified plants from the insertion of a Bacillus thuringiensis gene that confers to the plant the expression of proteins with insecticidal actions. However, after two or three years these technologies reduce the degree of suppression of larvae, mainly due to the continuous and inadequate use of the technology. The objective of this work was to study in field conditions, the behavior of Bt corn hybrids against lepidopteran attacks as S. frugiperda and Helicoverpa zea in four corn-producing regions of São Paulo State, as well as to study in laboratory conditions the comparative biology of populations of S. frugiperda collected in these regions. Field experiments were carried out during the second corn season in 2014 in the regions of Médio Paranapanema, Centro Norte, Noroeste and Norte of São Paulo State where were used 25 corn cultivars with the expression of different insecticidal proteins. To the comparative biology study, the larvae were collected in the four regions of the state, the larvae were sent to Integrated Pest Management Laboratory of FCAV-Unesp where the experiments were carried out with leaves of corn hybrids of different technologies. The results of field experiments demonstrate that the insecticidal protein VIP3Aa20 presents a high level of suppression on the populations of S. frugiperda and H. zea, in addition, the corn hybrids that express the insecticidal protein Cry1F were the most susceptible against the attack of these two pests. Through the results obtained from the experiments of comparative biology, it was verified that the insecticidal protein VIP3Aa20 provided 100% of mortality of larvae from the four regions. The hybrid with expression of the proteins Cry1A.105 + Cry2Ab2 + Cry1F was the one that provided low viability of S. frugiperda larvae coming from the four regions of the São Paulo State. The hybrid that expresses the insecticidal protein Cry1F provided low levels of suppression as well as low adverse effects in the development of S. frugiperda coming from the four regions of the state, indicating that the populations present in these four regions are resistant to the action of this insecticidal protein.
The fall armyworm Spodoptera frugiperda is the major pest of corn in tropical and subtropical regions in the American Continent. Among the most used methods to control this pest in Brazil, it highlights the use of genetically modified plants from the insertion of a Bacillus thuringiensis gene that confers to the plant the expression of proteins with insecticidal actions. However, after two or three years these technologies reduce the degree of suppression of larvae, mainly due to the continuous and inadequate use of the technology. The objective of this work was to study in field conditions, the behavior of Bt corn hybrids against lepidopteran attacks as S. frugiperda and Helicoverpa zea in four corn-producing regions of São Paulo State, as well as to study in laboratory conditions the comparative biology of populations of S. frugiperda collected in these regions. Field experiments were carried out during the second corn season in 2014 in the regions of Médio Paranapanema, Centro Norte, Noroeste and Norte of São Paulo State where were used 25 corn cultivars with the expression of different insecticidal proteins. To the comparative biology study, the larvae were collected in the four regions of the state, the larvae were sent to Integrated Pest Management Laboratory of FCAV-Unesp where the experiments were carried out with leaves of corn hybrids of different technologies. The results of field experiments demonstrate that the insecticidal protein VIP3Aa20 presents a high level of suppression on the populations of S. frugiperda and H. zea, in addition, the corn hybrids that express the insecticidal protein Cry1F were the most susceptible against the attack of these two pests. Through the results obtained from the experiments of comparative biology, it was verified that the insecticidal protein VIP3Aa20 provided 100% of mortality of larvae from the four regions. The hybrid with expression of the proteins Cry1A.105 + Cry2Ab2 + Cry1F was the one that provided low viability of S. frugiperda larvae coming from the four regions of the São Paulo State. The hybrid that expresses the insecticidal protein Cry1F provided low levels of suppression as well as low adverse effects in the development of S. frugiperda coming from the four regions of the state, indicating that the populations present in these four regions are resistant to the action of this insecticidal protein.
Descrição
Palavras-chave
Lagarta-do-cartucho, Zea mays, Bacillus thuringiensis, Fall armyworm