Comparing the acute sensitivity of growth and photosynthetic endpoints in three Lemna species exposed to four herbicides

详细信息    查看全文

• 作者：Jihae Park^a ; ^b ; Murray T. Brown^c ; Stephen Depuydt^b ; Jang K. Kim^d ; Dam-Soo Won^e ; Taejun Han^d ; ^{hanalgae@hanmail.net}
• 关键词：Herbicides ; Lemna ; Frond area ; Root length ; Chlorophyll a fluorescence ; Toxicity
• 刊名：Environmental Pollution
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：220
• 期：part_PB
• 页码：818-827
• 全文大小：823 K
• 卷排序：220

文摘

An ecological impact of four herbicides (atrazine, diuron, paraquat and simazine) was assessed using Lemna gibba, Lemna minor and Lemna paucicostata with several ecologically relevant parameters (increase in frond area, root length after regrowth, maximum and effective quantum yield of PSII and maximum electron transport rate (ETRmax). Based on EC50 values, the most toxic herbicides were diuron and paraquat and the most sensitive endpoints were root length (6.0–12.3 μg L−1) and ETRmax (4.7–10.3 μg L−1) for paraquat and effective quantum yield (6.8–10.4 μg L−1) for diuron. Root re-growth and chlorophyll a fluorescence parameters in all three Lemna species were sensitive enough to detect toxic levels of diuron and paraquat in water samples in excess of allowable concentrations set by international standards.