Combined effects of environmental factors on algal and cyanobacterial physiology

环境因素对藻类和蓝藻生理的综合影响

• 批准号: RGPIN-2017-06210
• 负责人: Juneau, Philippe
• 金额: $ 2.04万
• 依托单位: Université du Québec à Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=712091
• 关键词: Combined; effects; environmental; factors; algal

Pollution caused by pesticides is an actual problem for many aquatic ecosystems. Phytoplankton (algae and cyanobacteria) found in these waters are the first organisms of the food web and may, unfortunately, be very sensitive to water quality variations. Lakes and rivers are impacted rarely by only one pollutant and the toxicity of these chemicals may be affected by other environmental factors, such as light, water temperature and other substances. Very few studies were performed in the past to understand the combined effect of these environmental stressors on the physiology of algae and cyanobacteria. In this research program we will study the effects of some pesticides (glyphosate, mesotrion, atrazine, clothianidine and captane) when combined together or to other environmental factors (temperature or light) on phytoplankton physiology. We will focus on the impacts that these environmental factors have on photosystem II photosystem I electron transport and alternative electron pathways (e.g. PSI cyclic electron flow). We will also study the mechanisms involved in the resistance of phytoplankton species to the combination of environmental factors (e.g. the non-photochemical energy dissipation processes and the antioxidant enzyme system). We will also use transcriptomic approach to complement the functional data and to obtain further insights in underlying mechanisms. This research will permit, by linking gene expression to physiological processes, to obtain a better understanding of the interaction of different environmental stressors on algal and cyanobacterial metabolism. On a long term, this research may help to establish new water quality criteria based on the interaction of pollutants with natural occurring environmental factors.

农药造成的污染是许多水生生态系统面临的实际问题。在这些水域中发现的浮游植物（藻类和蓝细菌）是食物网中最早的生物，不幸的是，它们可能对水质变化非常敏感。湖泊和河流很少只受到一种污染物的影响，这些化学物质的毒性可能会受到其他环境因素的影响，例如光、水温和其他物质。过去很少有研究来了解这些环境压力源对藻类和蓝藻生理学的综合影响。 在本研究项目中，我们将研究某些农药（草甘膦、硝磺草酮、莠去津、噻虫胺和克敌烷）组合使用时或与其他环境因素（温度或光照）对浮游植物生理学的影响。我们将重点关注这些环境因素对光系统 II 光系统 I 电子传输和替代电子路径（例如 PSI 循环电子流）的影响。我们还将研究浮游植物物种对环境因素组合（例如非光化学能量耗散过程和抗氧化酶系统）的抵抗机制。我们还将使用转录组学方法来补充功能数据并获得对潜在机制的进一步见解。 这项研究将通过将基因表达与生理过程联系起来，更好地了解不同环境压力源对藻类和蓝藻代谢的相互作用。从长远来看，这项研究可能有助于根据污染物与自然环境因素的相互作用建立新的水质标准。