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- Title
Trophic transfer and effects of soil cadmium in maize-fall armyworm-stinkbugs.
- Authors
Yali Liu; Shimin Huang; Fangmei Wang; Yangbeijia Liu; Fuman Cai; Jianwu Wang; Yinghua Shu
- Abstract
Maize (Zea mays) is a widely used crop in phytoremediation coupled with agro-production (PCA) in cadmium (Cd)-contaminated farmlands in China. However, the potential effects of natural enemies on herbivorous insects during the restoration process is scarcely documented. The trophic transfer of soil Cd (1.0 and 2.5 mg/kg, referred to as Cd1.0 and Cd2.5) in the food chain of maize-fall armyworm (Spodoptera frugiperda)-stinkbug (Arma chinensis) and its effects on three trophic levels were investigated. The Cd content of Huayu No. 8 maize kernels was within the national feed hygiene standard (GB13078-2017, Cd ≥ 1.0 mg/kg) under Cd treatments. Soil Cd stress reduced maize biomass and chlorophyll content but not plant height. However, amino acids and soluble sugars contents, as well as peroxidase (POD) and superoxide dismutase (SOD) activities were increased in the Cd treatments. The growth of S. frugiperda feeding on maize in Cd polluted soil was inhibited, with higher toxicity of the Cd1.0 treatment. In addition, the impact on S. frugiperda was closely related to the chemical forms of Cd (oxalic Cd) and soluble sugars in the maize leaves. Cd dilution was observed from S. frugiperda to A. chinensis, and the Cd treatments had no inhibitory effect on A. chinensis. Therefore, soil Cd (1.0 and 2.5 mg/kg) slightly inhibited maize growth but activated resistance to Cd stress, improved maize defense against S. frugiperda, and had no side effect on the ecological benefits of A. chinensis, which is of great significance for ecological prevention and pest control in PCA practice.
- Subjects
FALL armyworm; PEST control; SUPEROXIDE dismutase; CORN; FOOD chains
- Publication
Entomologia Generalis, 2024, Vol 44, Issue 6, p1481
- ISSN
0171-8177
- Publication type
Academic Journal
- DOI
10.1127/entomologia/2024/2618