Kinnear S H W, Fabbro L D, Duivenvoorden L J
Freshwater Ecology Group, Centre for Environmental Management, Central Queensland University, Rockhampton, QLD, Australia.
Arch Environ Contam Toxicol. 2008 Feb;54(2):187-94. doi: 10.1007/s00244-007-9026-0. Epub 2007 Aug 31.
Static-renewal ecotoxicity trials monitored growth of Hydrilla verticillata in conjunction with exposure to Cylindrospermopsis raciborskii whole-cell extracts containing the cyanotoxin cylindrospermopsin (CYN). Maximum exposure concentrations were 400 microg L(-1) CYN over 14 days. The responses of Hydrilla to the treatments were variable according to the toxin concentrations and lengths of exposure. Plant deaths, chlorosis, and necrosis were not recorded from treated plants. However, Hydrilla experienced significant growth stimulation and redistribution of plant resources in conjunction with exposure to the whole-cell extracts. Root production was particularly impacted. The results of this study imply that root production could aid in reducing C. raciborskii cell concentrations and CYN toxicity. Results of chlorophyll analyses differed, indicating that CYN in whole-cell extracts might exert complex effects on photosynthesis. This is the first study to describe the responses of an aquatic macrophyte following exposure to C. raciborskii whole-cell extracts containing the cyanotoxin cylindrospermopsin.
静态更新生态毒性试验监测了黑藻在暴露于含有蓝藻毒素柱孢藻毒素（CYN）的柱孢鱼腥藻全细胞提取物时的生长情况。在14天内，最大暴露浓度为400微克/升CYN。根据毒素浓度和暴露时间的不同，黑藻对处理的反应各不相同。未记录到处理过的植物出现植株死亡、黄化和坏死现象。然而，黑藻在暴露于全细胞提取物时经历了显著的生长刺激和植物资源重新分配。根系生长尤其受到影响。本研究结果表明，根系生长可能有助于降低柱孢鱼腥藻细胞浓度和CYN毒性。叶绿素分析结果存在差异，表明全细胞提取物中的CYN可能对光合作用产生复杂影响。这是第一项描述水生大型植物在暴露于含有蓝藻毒素柱孢藻毒素的柱孢鱼腥藻全细胞提取物后的反应的研究。
