Impacto do aumento da concentração de CO2 em Mahanarva spectabilis (Hemiptera: Cercopidae) alimentada em gramíneas forrageiras

• Ano de defesa: 2011
• Autor(a) principal: Ferreira, Roberta Botelho
• Orientador(a): Moraes, Jair Campos de
• Banca de defesa: Auad, Alexander Machado, Fonseca, Marcy das Graças
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: UNIVERSIDADE FEDERAL DE LAVRAS
• Programa de Pós-Graduação: DEN - Programa de Pós-graduação
• País: BRASIL
• Palavras-chave em Português: Spittlebug; Mudanças climáticas; Braquiária; Capim-elefante; Cigarrinha-das-pastagens; Pennisetum purpureum; Brachiaria decumbens; Brachiaria brizantha; Climate change
• Área do conhecimento CNPq: CNPQ_NÃO_INFORMADO
• Link de acesso: https://repositorio.ufla.br/handle/1/2766

The effects of high CO2 concentrations [CO2] on plants can cause an increase in production to generate significant response in photosynthesis, metabolism and development of plants. The consequence of these changes in the biology of spittlebug, major pests associated with grasses, does not exist. The aim of this study was to evaluate the impact of different [CO2] in the biological aspects of Mahanarva spectabilis fed grasses. Was used 4x3 factorial, involving four grasses (Brachiaria decumbens, Brachiaria brizantha and Pennisetum purpureum cv. Roxo de Botucatu, cv. Pioneiro) in three [CO2]. The plants were kept in climate chambers with 14 h photophase, Tº = 25 ± 1 ºC (day) and 20 ± 1 ºC (night) and RH 70 ± 10% and three [CO2], 250ppm, CO2 swinging (average 368ppm) and 500ppm. Was analyzed the percentage of nymphs, longevity (days) of adults, fecundity, weight mass (g) dry of root and shoot and number of dead plants. The nymphal survival rate showed no significant results at all three levels of CO2 for two Brachiaria evaluated. However, Roxo de Botucatu e Pioneiro showed percentage nymph survival significantly lower in the 250ppm atmospheric CO2 than the environment swinging and 500pp. The mean of longevity of adults of M. spectabilis did not show significant differences in the three [CO2] studied. To B. decumbens and B. brizantha was loss of dry mass (shoot) in environments with swinging and 500ppm CO2. In these environments corresponding, the Pioneiro had increase of dry mass (shoot) in relation of Roxo de Botucatu. Was concluded that the [CO2] to 500 ppm, evaluated the biological aspects of M. spectabilis not changed, and this can occur in a future scenario where one expects [CO2] near this value.