RUI: Collaborative Research: Production of Toxins by Bloom-Forming Macroalgae.

RUI：合作研究：水华形成的大型藻类产生毒素。

• 批准号: 0718341
• 负责人: Timothy Nelson
• 金额: --
• 依托单位: Seattle Pacific University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0718341&HistoricalAwards=false
• 关键词: RUI; Collaborative; Research; Production; Toxins

Excessive growths of green seaweeds (often referred to as algal or seaweed blooms or "green tides") can cause many environmental problems, some of which are thought to be a result of toxins produced by the seaweeds. These toxins can dramatically affect other plants and animals; however, little is known about their production. Toxins that have already been identified include dopamine, and two breakdown products of dimethylsulfoniopropionate (DMSP): acrylic acid and dimethyl sulfide (DMS). In this study, the following questions will be addressed: 1) What triggers the production of dopamine and DMSP? Are the amounts of these toxins constant or do they change in response to changes in the environment? Is production different in different seasons or in different places?; 2) Where and how are these toxins produced and stored in the cells?, 3) Why is dopamine toxic? Does it produce additional damage when it degrades?; and 4) If new toxins are identified, what triggers their production and how do they work? A better understanding of how seaweed toxins are produced and work will help determine if, when, and where seaweed blooms will affect marine communities or harm economically and ecologically important species. Because these seaweeds are found around the world, the results of this study will apply beyond the Pacific Northwest. DMSP produced by phytoplankton is important in global sulfur cycles. Knowing more about DMSP in seaweeds should result in a better understanding of DMSP in phytoplankton and, therefore, the role of DMSP in the global sulfur cycle. Graduate and undergraduate training will be an important part of this work. At least three undergraduates and two graduate students will work on the study and will learn electron and fluorescence microscopy and chemical separation and identification techniques.

绿色海藻的过度生长（通常被称为藻华或“绿潮”）会导致许多环境问题，其中一些被认为是由海藻产生的毒素造成的。这些毒素会严重影响其他动植物；然而，人们对它们的生产知之甚少。已经确定的毒素包括多巴胺和二甲基磺酰丙酸（DMSP）的两种分解产物：丙烯酸和二甲基硫醚（DMS）。在本研究中，将解决以下问题：1)是什么触发了多巴胺和DMSP的产生？这些毒素的数量是恒定的还是会随着环境的变化而变化？不同季节或不同地方的产量不同吗？2)这些毒素是在哪里以及如何在细胞中产生和储存的？3)为什么多巴胺有毒？当它降解时是否会产生额外的伤害？4)如果发现新的毒素，是什么触发了它们的产生，它们是如何起作用的？更好地了解海藻毒素是如何产生和发挥作用的，将有助于确定海藻繁殖是否、何时以及在何处会影响海洋群落或危害经济和生态上重要的物种。因为这些海藻在世界各地都有发现，所以这项研究的结果将适用于太平洋西北部以外的地区。浮游植物产生的DMSP在全球硫循环中起重要作用。了解更多关于海藻中的DMSP，将有助于更好地了解浮游植物中的DMSP，从而更好地了解DMSP在全球硫循环中的作用。研究生和本科生的培养将是这项工作的重要组成部分。至少有三名本科生和两名研究生将参与这项研究，并将学习电子和荧光显微镜以及化学分离和鉴定技术。