Effects of three pesticides on the growth,photosynthesis and photoinhibition of the edible cyanobacterium Ge-Xian-Mi（Nostoc）
作者单位：Département des Sciences Biologiques-TOXENCanada Research Chair on Ecotoxicology of Aquatic MicroorganismsUniversité du Québec à MontréalSuccursale Centre-villeC.P.8888 MontréalQuébecCanada H3C 3P8
会议名称：《中国海洋湖沼学会藻类学分会第七届会员大会暨第十四次学术...》
会议日期：2007年
学科分类：07[理学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学]
关 键 词：Cyanobacterium Growth Paddy field Pesticide Photoinhibition Photosynthesis
摘 要：正Effects of butachlor,bensuifuron-methyl and dimethoate on the growth,photosynthesis and photoinhibition of the edible cyanobacterium Ge-Xian-Mi were examined in order to gain insight into the relationship between its productivity reduction and the abusive use of pesticides in the *** inhibition of growth was found in the presence of 4-6 fold field concentration of butachlor and very high concentrations of bensulfuron-methyl and *** stimulation of photosynthesis was observed over a limited range of low concentrations of these three *** found that PSII and PSI were respectively the inhibitory sites of 150 μM butachlor and 150 μM ***,the inhibitory site of 2000 μM dimethoate seems to be situated at the terminal of whole chain or dark *** colonies exposed to 150 μM butachlor were more sensitive to high light than the control cells and those exposed to bensulfuron-methyl,dimethoate or low butachlor *** light induced rapid recovery of photoinhibited colonies was observed for the control,10 μM butachlor,bensulfuron-methyl and dimethoate ***, the maximal PSII photochemical efficiency of photoinhibited colonies treated with 150 μM butachlor was maintained at a relatively stable value in low *** findings suggested that the abusive utilization of butachlor might be an important factor limiting the productivity of Ge-Xian-Mi in the field.