Growth and photosynthesis inhibition by agricultural pesticides in three freshwater microalgae
Growth and photosynthesis inhibition by agricultural pesticides in three freshwater microalgae
复制标题
农药对三种淡水微藻生长和光合作用的抑制
DOI：
10.1046/j.1444-2906.2002.00400.x
复制
发表时间：
2002
影响因子：
1.9
通讯作者：
H. Nakahara
中科院分区：
文献类型：
--
作者：
Nicholas G. Guanzon;H. Nakahara
：测定了铜绿微囊藻、四尾藻和细粒藻在不同浓度农用农药CNP（对硝基苯基2,4,6-三氯苯醚）、MEP （O，O-二甲基O-（3-甲基-4-硝基苯基）硫代磷酸盐）、ISP（异丙硫烷（C12H18O4S2））和TBT（三正丁基氯化锡）作用下的生长速率和光合作用。然后计算各微藻生长和光合作用的有效浓度（EC50）。CNP和TBT对3种微藻生长和光合作用的抑制作用最大。铜绿微囊藻和肉芽单胞菌的耐受性较好，而四角单胞菌的敏感性较高。除MEP外，3种微藻生长的EC50值均高于光合作用。生长-光合响应关系表明，对于CNP和TBT，较低暴露浓度（0.001 ~ 0.05 μg/L）下，3种生物的生长受抑制程度低于光合作用受抑制程度。在较高暴露量（0.10 ~ 1.0 μg/L）下，相对生长率与相对光合作用呈正比关系。对于MEP和ISP，所有被试生物的相对生长速率和相对光合作用之间存在成比例的响应。这些结果表明，农药对三种微藻生长和光合作用的抑制作用不同。这种差异可以从四种农药的理化性质和三种微藻的生理形态性质来解释。
: Growth rate and photosynthesis of Microcystis aeruginosa, Scenedesmus quadricauda and Aulacoseira granulata exposed to different concentrations of the agricultural pesticides CNP (p-nitrophenyl 2,4,6-trichlorophenyl ether), MEP [O,O-dimethyl O-(3-methyl-4-nitrophenyl) thiophosphate], ISP [isoprothiolane (C12H18O4S2)], and TBT (tri-n-butyltin chloride) were determined. The effective concentration (EC50) for growth and photosynthesis in each species of microalga was then calculated. Inhibition of growth and photosynthesis in the three microalgae was greatest when exposed to CNP and TBT. Microcystis aeruginosa and A. granulata showed a higher tolerance, whereas S. quadricauda showed a higher sensitivity. Except for MEP, the EC50 values for growth obtained in the three microalgae were higher than those for photosynthesis. The growth–photosynthesis response relationship showed that, for CNP and TBT, growth of the three organisms tested were less inhibited than their photosynthesis at a lower exposure (0.001–0.05 μg/L). At a higher exposure (0.10–1.0 μg/L), the response between relative growth rates and relative photosynthesis was proportional. For MEP and ISP, a proportional response existed between relative growth rates and relative photosynthesis in all test organisms. These results suggest that the inhibition of growth and photosynthesis by agricultural pesticides differs for the three microalgae. The differences can be explained in terms of the physico-chemical properties of the four pesticides and the physiological and morphological properties of the three microalgae.