de Bastos Pazini Juliano, Dionei Grützmacher Anderson, Júnior Seidel Enio, Costa Padilha Aline, Felisberto da Silva Fernando, Bernardi Daniel, Orrin Way Michael, da Silva Martins José Francisco
Federal University of Pelotas, Department of Plant Protection, Eliseu Maciel Avenue, 96010-900, Pelotas, Rio Grande do Sul, RS, Brazil.
Federal University of Santa Maria, Department of Statistic, Roraima Avenue, 97105-900, Santa Maria, Rio Grande do Sul, RS, Brazil.
J Econ Entomol. 2022 Apr 13;115(2):671-681. doi: 10.1093/jee/toac003.
Plant resistance is a key strategy for the management of Oryzophagus oryzae (Costa Lima) (Coleoptera: Curculionidae), an important pest in South American rice paddies. The present study investigated the resistance of rice cultivars in terms of feeding and oviposition preference, growth, development, and biological performance of O. oryzae under natural conditions of field infestation during two consecutive rice seasons. There were no effects of the six cultivars on the feeding and oviposition preferences of O. oryzae as evaluated 5, 8, and 11 d After Flooding (DAF) of the plots, indicating the absence of antixenosis. Cultivars did not differ in terms of egg viability and larval density of first instars on the roots at 15 DAF. Significant differences were found 25 and 35 DAF when larval density per sample was high on 'BRS Pampa CL' (up to 24.5), intermediate on 'BRS Querência' and 'BRS Ligeirinho' (up to 16.1), and low on 'BRS Atalanta', 'BRS Firmeza', and 'Dawn' (up to 8.8). The cultivars 'BRS Atalanta', 'BRS Firmeza', and 'Dawn' caused malnutrition and inhibition of larval growth. These effects, typical of antibiosis, resulted in delayed pupation and emergence of adults; in addition, emerged females had body weight decreased strongly. The cultivars BRS Pampa CL, BRS Querência, and BRS Ligeirinho are susceptible, resulting in high larval populations and more suitable development of O. oryzae; antibiosis, as indicated for 'BRS Atalanta', 'BRS Firmeza', and 'Dawn', probably is the key mechanism of rice resistance to O. oryzae.
植物抗性是管理稻水象甲（Costa Lima）（鞘翅目：象甲科）的关键策略，稻水象甲是南美稻田中的一种重要害虫。本研究在连续两个水稻季节的田间自然侵染条件下，从取食和产卵偏好、稻水象甲的生长、发育及生物学表现等方面，对水稻品种的抗性进行了调查。在小区淹水5、8和11天后评估，这六个品种对稻水象甲的取食和产卵偏好均无影响，表明不存在抗生性。在淹水15天后，各品种在卵的活力和根部一龄幼虫密度方面没有差异。在淹水25天和35天后发现了显著差异，此时，‘BRS Pampa CL’上每个样本的幼虫密度很高（高达24.5），‘BRS Querência’和‘BRS Ligeirinho’上中等（高达16.1），而‘BRS Atalanta’、‘BRS Firmeza’和‘Dawn’上较低（高达8.8）。‘BRS Atalanta’、‘BRS Firmeza’和‘Dawn’这几个品种导致幼虫营养不良并抑制其生长。这些抗生性典型效应导致化蛹延迟和成虫羽化延迟；此外，羽化出的雌虫体重显著下降。品种BRS Pampa CL、BRS Querência和BRS Ligeirinho易感，导致幼虫数量多且稻水象甲发育更适宜；如‘BRS Atalanta’、‘BRS Firmeza’和‘Dawn’所示的抗生性，可能是水稻对稻水象甲抗性的关键机制。
