铜绿微囊藻胁迫对黄菖蒲化感作用的诱导效应

第27卷第2期2014年4月环境科技EnvironmentalScienceandTechnologyV0l_27No．2Apr．2014铜绿微囊藻胁迫对黄菖蒲化感作用的诱导效应陈国元．唐凯(厦门理工学院环境科学与工程学院，福建厦门361024)摘要：通过研究不同初始密度铜绿微囊藻与黄菖蒲共同培养的种植水对铜绿微囊藻生长特性的影响，分析了铜绿微囊藻胁迫对黄菖蒲化感作用的诱导效应。结果显示，初始藻密度分别为0，1．0×105,1．0×10和1．0×107cell／mL时，相对应的黄菖蒲种植水对铜绿微囊藻的抑制率及铜绿微囊藻MDA浓度先逐渐增加然后降低；同时，铜绿微囊藻叶绿素a浓度呈现先降低后增加的趋势；各个处理组中，铜绿微囊藻SOD活性也表现出明显的差异，表明铜绿微囊藻胁迫对黄菖蒲的化感作用具有一定的诱导效应，具体表现为：一定范围内，铜绿微囊藻初始密度越高，其胁迫效应促使黄菖蒲释放越多的化感物质，导致其种植水化感抑藻能力增强，但是在铜绿微囊藻密度过高时，黄菖蒲种植水的化感抑藻能力开始降低关键词：铜绿微囊藻；胁迫；黄菖蒲；化感作用；诱导效应中图分类号：X1文献标识码：A文章编号：1674—4829《2014)02—0oO5—05InductiveEfectsofMicrocystisAeruginosaStressontheAilelopathyofIrisPseudacorusL．CHENGuo-yuan，TANGKai(CollegeofEnvironmentalSciencesandEngineering，XiamenUniversityofTechnology，Xiamen361024，China)Abstract：ThroughtheanalysisonthegrowthcharacteristicsofM．aeruginosabytheplantingwaterofI．pseudacorusL．CO—cultivatedwithdifferentinitialdensityofM．aeruginosa，theinductiveeffectsofM．aeruginosa'sstressontheallelopathyofI．pseudacorusL．wereinvestigated．TheresultsshowedthattheIR(inhibitionrate)ofM．aeruginosaSgrowthbythecorrespondingplantingwaterofI．pseudacorusL．andMDAcontentofM．aeruginosashowedincreasedinitiallyanddecreasedgraduallythereafterwhiletheinitialdensitiesofM．aeruginosawere0，1．0×10，1．0×106and1．0×107eell／mL．Meanwhile，chlorophyU-acontentofM．aeruginosadecreasedinitiallyandincreasedgraduallythereafter．TheSODactivityofM．aeruginosashowedsignificantdifferenceamongalltreatmentgroupsaswel1．ItwasdemonstratedthatM．aeruginosa'sstresshadsomeinductiveeffectontheallelopathyofI．pseudaeorusL．withinacertainrange，thehigherinitialdensityofM．aeruginosawas，themorealleloehemiealswouldbereleasedfromI．pseudacorusL．promptedbyM．aemginosa'sstress，whichwouldleadtothatthecorespondingplantingwaterofI．pseudaeorusL．hadstrongallelopathieabilitytoinhibitthegrowthofalgae．However，whentheinitialdensityofM．aeruginosawastoohigh，thecorespondingI．pseudacorusL．plantingwater'sallelopathicinhibitionabilitybegantodecline．Keywords：Microcystisaeruginosa；Stress；IrispseudacorusL．；Allelopathy；Inductiveeffect0引言植物