Zavala-Mazariegos Francisco Javier, Cruz-Esteban Samuel, Álvarez-Solís José David, Rojas Julio C
Departamento de Ecología y Manejo de Artrópodos, Grupo de Ecología Química, El Colegio de la Frontera Sur (ECOSUR), Tapachula, Chiapas, Mexico.
Investigador independiente, Tapachula, Chiapas, Mexico.
Environ Entomol. 2025 Jun 18;54(3):615-622. doi: 10.1093/ee/nvaf045.
Arbuscular mycorrhizal fungi are key components of the soil microbiota and are characterized by their symbiosis with terrestrial plants. In addition to providing nutrients to plants during symbiosis, arbuscular mycorrhizal fungi can enhance plant defenses against herbivorous insects and pathogens, including induced systemic resistance. Previous studies have demonstrated that Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) larvae perform better in maize plants colonized by arbuscular mycorrhizal fungi, which generally exhibit greater growth and higher nitrogen and phosphorus contents. However, these studies were limited to a small number of maize varieties. Additionally, prior research has not considered the host preference of S. frugiperda females for noncolonized versus arbuscular mycorrhizal fungi-colonized maize plants, although female choice can significantly influence progeny performance. In this study, we evaluated the effects of Rhizophagus irregularis (Blaszk, Wubet, Renker, & Buscot) C. Walker & A. Schüßler (Glomerales: Glomeraceae) inoculation on 4 maize inbred lines (CML 124, CML 343, CML 122, and CML 126) susceptible to S. frugiperda on female oviposition preference and larval performance of S. frugiperda. Overall, females preferred ovipositing on uncolonized seedlings to arbuscular mycorrhizal fungi-colonized seedlings, independent of the inbred lines. Larval performance was affected by inbred lines and arbuscular mycorrhizal fungi colonization. Larvae feeding on noncolonized maize seedlings exhibited significantly higher weights than those feeding on arbuscular mycorrhizal fungi-colonized seedlings. Among the inbred lines, larvae fed CML 122 performed better than those fed CML 126 and CML 343 seedlings. The weight of the larvae fed on CML 124 seedlings was similar to that of the larvae fed on CML 122, CML 126, and CML 343 seedlings.
丛枝菌根真菌是土壤微生物群的关键组成部分，其特点是与陆生植物共生。在共生过程中，丛枝菌根真菌除了为植物提供养分外，还能增强植物对食草昆虫和病原体的防御能力，包括诱导系统抗性。先前的研究表明，草地贪夜蛾（J. E. 史密斯）（鳞翅目：夜蛾科）幼虫在被丛枝菌根真菌定殖的玉米植株中生长得更好，这些玉米植株通常生长得更大，氮和磷含量更高。然而，这些研究仅限于少数几个玉米品种。此外，尽管雌虫的选择会显著影响后代的表现，但之前的研究并未考虑草地贪夜蛾雌虫对未被定殖的玉米植株和被丛枝菌根真菌定殖的玉米植株的寄主偏好。在本研究中，我们评估了接种不规则球囊霉（布拉斯克、武贝特、伦克和布斯考特）C. 沃克和A. 舒斯勒（球囊霉目：球囊霉科）对4个对草地贪夜蛾敏感的玉米自交系（CML 124、CML 343、CML 122和CML 126）上草地贪夜蛾雌虫产卵偏好和幼虫表现的影响。总体而言，无论自交系如何，雌虫都更喜欢在未被定殖的幼苗上产卵，而不是在被丛枝菌根真菌定殖的幼苗上。幼虫表现受到自交系和丛枝菌根真菌定殖的影响。取食未被定殖的玉米幼苗的幼虫体重显著高于取食被丛枝菌根真菌定殖的幼苗的幼虫。在自交系中，取食CML 122的幼虫比取食CML 126和CML 343幼苗的幼虫表现更好。取食CML 124幼苗的幼虫体重与取食CML 122、CML 126和CML 343幼苗的幼虫体重相似。
