水生生物学报2008，Vol.32Issue(4)：462-468,7.
草甘膦对可食用蓝藻葛仙米生长和生理的影响
EFFECTS OF ACUTE GLYPHOSATE EXPOSURE ON THE GROWTH AND PHYSIOLOGY OF NOSTOC SPHAEROIDES, AN EDIBLE CYANOBACTERIUM OF PADDY RICE FIELDS
摘要
Abstract
The productivity of Nostoc sphaeroides,an edible cyanobacterium found in paddy rice fields has declined in recent years. It may relate to the increased application of agricultural herbicides. To assess the impact of glyphosate exposure(0.15,0.30,0.45 and 0.6 mmol/L Gly acid) ,the effects on colony size,dry biomass accumulation,chlorophyll a fluorescence (Fv/Fm) and chlorophyll a biosynthesis were investigated over an 8d period. All parameters were significantly inhibited in a concentration used and time dependent way. After 2d exposure to 0. 15 mmol/L Gly colonies were approximately 15% smaller than the controls. After 4d exposure,chlorophyll a content and Fv/Fm were affected by the highest concentration used(0.6 mmol/L Gly). By the 8d, chlorophyll biosynthesis and Fv/Fm were significantly inhibited by concentrations greater than 0.15 and 0.3 mmol/L Gly, respectively. The 8d relative growth rates ( RGRs), calculated for dry biomass, were significantly affected by all glyphosate treatments,there was a 60% reduction at 0.15 mmol/L Gly and negative RGRs at higher concentrations indicate a loss of biomass. Exposure to 0. 6 mmol/L Gly was lethal with loss of colony integrity,bleaching of pigments and no photosynthetic activity by 8d. These results are discussed in terms of the mechanisms of toxicity and the potential implications for the long term sustainability of the N. sphaeroides resource.关键词
除草剂/蓝藻/毒性/生长/叶绿素a荧光Key words
Herbicide/Blue-green alga/Toxicity/Growth/Chlorophyll a fluorescence分类
生物科学引用本文复制引用
阮祚禧,Murray T.Brown..草甘膦对可食用蓝藻葛仙米生长和生理的影响[J].水生生物学报,2008,32(4):462-468,7.基金项目
the National Natural Science Foundation of China ( No. 40676063 and 30670396 ) （ No. 40676063 and 30670396 ）
Natural Science Foundation of GnangdongProvince (06105649) （06105649）
