Department of Crop Science and Technology, College of Agriculture, South China Agricultural University, Guangzhou 510642, China; Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, China; Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou 510642, China.
Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, China; Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou 510642, China; Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China.
Chemosphere. 2018 Jun;200:151-163. doi: 10.1016/j.chemosphere.2018.02.042. Epub 2018 Feb 8.
By exposing herbivorous cutworm Spodoptera litura (Lepidoptera: Noctuidae) larvae to Cadmium (Cd) stress via Cd treated cabbages Brassica campestris and artificial diets, we investigated effects of Cd accumulation in larvae on their survival and food utilization. The results showed that Cd transferred from soils contaminated with different Cd concentrations through cabbages-larvae, and be mainly accumulated in larvae guts. There was a dose-response relationship between Cd accumulations in larvae cuticle, head, guts and Cd concentrations in artificial diets, and the highest one was found in the guts, regardless of generations. High Cd stress (10 mg kg Cd in soil, 40.6, 81.2 mg kg Cd in artificial diets) had inhibited effects on larvae growth and food utilization, whereas low Cd stress (Lvbao 701 planted in 2.5 mg kg Cd soil, 4.06 mg kg Cd in artificial diets) showed stimulated effect. Cd accumulations in the guts were significantly negative correlated with efficiency of conversion of ingested food (ECI) and relative growth rate (RGR) of larvae feeding on Cd treated diets or cabbages while were significantly positive correlated with relative consumption rate (RCR). Therefore, after S. litura larvae feed on Cd treated natural food or artificial diets, Cd could be transferred to different tissues, and mainly accumulated in the guts, which significantly affected growth and food utilization. Additionally, Cd stress via Cd treated artificial diets presented less detrimental effects on S. litura larvae than via Cd treated cabbages.
通过用 Cd 处理的甘蓝（芸薹属）和人工饲料暴露于 Cd 胁迫下的植食性斜纹夜蛾（鳞翅目：夜蛾科）幼虫，我们研究了幼虫中 Cd 积累对其生存和食物利用的影响。结果表明，Cd 从不同 Cd 浓度污染的土壤通过甘蓝-幼虫传递，并主要积累在幼虫肠道中。幼虫表皮、头部、肠道和人工饲料中 Cd 浓度之间存在 Cd 积累的剂量反应关系，而最高的是在肠道中，无论世代如何。高 Cd 胁迫（土壤中 10mg/kg Cd，人工饲料中 40.6、81.2mg/kg Cd）对幼虫生长和食物利用有抑制作用，而低 Cd 胁迫（在 2.5mg/kg Cd 土壤中种植绿宝 701，人工饲料中 4.06mg/kg Cd）则表现出刺激作用。幼虫肠道中的 Cd 积累与摄食效率（ECI）和以 Cd 处理的饲料或甘蓝为食的幼虫的相对生长率（RGR）显著负相关，而与相对取食量（RCR）显著正相关。因此，当 S. litura 幼虫取食 Cd 处理的天然食物或人工饲料后，Cd 可转移到不同组织中，主要积累在肠道中，这显著影响了幼虫的生长和食物利用。此外，通过 Cd 处理的人工饲料对 S. litura 幼虫的 Cd 胁迫比通过 Cd 处理的甘蓝的 Cd 胁迫的危害性小。
