The School of Conservation Sciences, Bournemouth University, Talbot Campus, Poole, Dorset, BH12 5BB, United Kingdom.
Environ Sci Technol. 2010 Mar 1;44(5):1610-6. doi: 10.1021/es9019386.
Many species of carnivorous plants have become endangered through exposure to multiple risks such as habitat loss, illegal poaching, and pollution. A potential threat to these plants posed by pollution stems from the contamination of their invertebrate prey with trace metals. This study examined the potential for prey to act as sources of the trace metals Cd and Cu for the pitcher plant Sarracenia leucophylla. Cd- and Cu-contaminated Diptera larvae were fed to S. leucophylla plants in separate experiments. The results demonstrated that Cd and Cu were readily transferred to the shoots of S. leucophylla in a dose-dependent manner. While the assimilation of Cu decreased with treatment level, the assimilation of Cd did not. Some assimilated Cu appeared to be translocated to the roots, but Cd was strongly retained in the shoots, where it was related to a reduction in shoot biomass. This suggested that on exposure to Cd-contaminated prey, the plants either experienced phytotoxicity or there was disruption of nutrient acquisition from the prey. Accumulation of Cu was not related to any sign of phytotoxicity.
许多肉食植物由于栖息地丧失、非法偷猎和污染等多种风险而濒临灭绝。污染对这些植物构成的潜在威胁源于其无脊椎猎物被痕量金属污染。本研究考察了猎物是否可能成为瓶子草（Sarracenia leucophylla）的痕量金属 Cd 和 Cu 的来源。在单独的实验中，用 Cd 和 Cu 污染的双翅目幼虫喂养瓶子草。结果表明，Cd 和 Cu 以剂量依赖的方式被迅速转移到瓶子草的地上部分。虽然随着处理水平的提高，Cu 的同化作用会降低，但 Cd 的同化作用不会降低。一些同化的 Cu 似乎被转运到根部，但 Cd 强烈地保留在地上部分，这与地上部分生物量的减少有关。这表明，在接触到受 Cd 污染的猎物时，植物要么经历了植物毒性，要么从猎物那里获取营养的过程受到了干扰。Cu 的积累与任何植物毒性迹象无关。
