土壤高锰对空心莲子草生长与草甘膦耐性的影响  

The effect of high level of manganese in the soil on the growth and glyphosate tolerance of alligator weed (Alternanthera philoxeroides)

作　　者：李洁[1,2] 朱金文[2] 刘亚光[1] 刘蕊[1,2] 朱国念[2] 

机构地区：[1]东北农业大学农学院,哈尔滨150030 [2]浙江大学农药与环境毒理研究所,杭州310029

出　　处：《农药学学报》2011年第4期359-363,共5页Chinese Journal of Pesticide Science

基　　金：国家自然科学基金项目(30771423);浙江省科技厅面上项目(2007C22014);浙江省自然科学基金项目(Y3100191);绍兴市科技局项目(2009A22025)

摘　　要：研究了空心莲子草Alternanthera philoxeroides在土壤中含高浓度锰（简称高锰）胁迫下的生长特性及对草甘膦的耐性。空心莲子草在锰添加量为8-128mg/kg的土壤中培养20d后,分枝数比对照（4.43个/株）增加了22.57%-48.31%,主茎长度比对照（23.85cm）增长了16.60%-19.87%,地下根茎数比对照（1.54个/株）增加29.87%-47.40%,全株干重比对照（0.23g）增加22.45%-27.00%;植株叶面积在锰添加量为32-128mg/kg范围内也显著高于对照（增加10.53%-11.10%）。用草甘膦（有效成分按草甘膦酸计）68、102和136g/hm2分别进行茎叶处理后21d,锰添加量为128mg/kg的处理,鲜重抑制率分别比不添加锰处理组下降27.39%、24.57%和30.06%。结果表明,土壤高锰条件下空心莲子草的生长和繁殖能力增强,这可能是土壤酸化背景下空心莲子草蔓延加剧的重要原因。土壤高锰条件下生长的空心莲子草对草甘膦的耐性显著增强,使得该杂草的防控形势更为严峻。The growth and glyphosate tolerance of alligator weed（Alternanthera philoxeroides） under high level of manganese（Mn） condition were studied.The results showed that when treated with 8-128 mg/kg Mn in the soil for 20 days,the branch numbers of alligator weed were significantly increased by 22.57%-48.31% compared to that of the control（4.43 per plant）,the length of the longest stems was significantly increased by 16.60%-19.87% compared to that of the control（23.85 cm）,the total rhizomes number were significantly increased by 29.87%-47.40% compared to that of the control（1.54 per plant）,and the dry weight of the alligator weed were significantly increased by 22.45%-27.00% compared to that of the control（0.23 g）.The areas of the leaves were also larger than that of the control in 32-128 mg/kg Mn treatment.21 days after the application of glyphosate in the dosage of 68,102 and 136 g ae/ha,the reduction of fresh weight of alligator weed declined by 27.39%,24.57% and 30.06%,respectively,in Mn 128 mg/kg treatment.The results indicated that the growth and propagation of alligator weed were stimulated when the Mn content in soil was increased,and this might be one of the major reasons leading to the spreading of the weed in acidic soil environment.Alligator weed showed remarkably tolerance to glyphosate under high Mn condition in the soil,implying it might be difficult to control the weed in the future.

关 键 词：锰 空心莲子草 草甘膦 耐药性 

分 类 号：S45[农业科学—植物保护] S481.4