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除藻剂对黄丝藻藻华叶绿素a含量和抗氧化酶活性的影响.docx

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除藻剂对黄丝藻藻华叶绿素a含量和抗氧化酶活性的影响 Abstract Thisstudyaimedtoinvestigatetheeffectsofalgaecidesonthechlorophyll-acontentandantioxidantenzymeactivityofMicrocystisaeruginosa.Resultsshowedthatalgaecidessignificantlydecreasedthechlorophyll-acontentofM.aeruginosa,butonlyaslightincreaseinsuperoxidedismutase(SOD)activitywasobserved.Theeffectsofdifferentalgaecidesvaried,withcoppersulfatehavingastrongerinhibitoryeffectonchlorophyll-acontentandSODactivitycomparedtochitosan.Ourfindingshighlightthepotentialprotectiveroleofchitosanagainstoxidativestressinalgae,whichmayhavebroaderimplicationsforalgalmanagementstrategies. Introduction Algalbloomsareaglobalenvironmentalproblemthatthreatensthehealthofaquaticecosystems,aswellashumanandanimalpopulationsthatrelyonthem.Thesebloomsareoftenfueledbyexcessivenutrientinputswhichpromotethegrowthofharmfulalgalspecies,suchasMicrocystisaeruginosa,acommonspeciesofcyanobacteriathatproducestoxinsharmfultohumanhealthandaquaticlife.Inresponse,algaecidesareoftenusedtocontrolalgalbloomsandpreventtheirnegativeeffects.However,theeffectsofalgaecidesonalgalphysiologyandthesurroundingecosystemarenotfullyunderstood. Oneofthemainmechanismsofalgaecidesistheinhibitionofphotosynthesisinalgae.Chlorophyll-aisthemostimportantpigmentforphotosynthesisinalgae,anditscontentisoftenusedasaproxyforphotosyntheticactivity.Previousstudieshaveshownthatalgaecidescancauseadecreaseinchlorophyll-acontentinalgae(Wangetal.,2016;Lietal.,2017),buttheeffectsofdifferentalgaecidesonchlorophyll-acontentarenotwellunderstood. Inadditiontophotosynthesisinhibition,algaecidescanalsocauseoxidativestressinalgae.Reactiveoxygenspecies(ROS)aregeneratedasanaturalbyproductofphotosynthesisandcancausecellulardamageifnoteliminatedbyantioxidantenzymes.AlgaecidescancauseanimbalanceintheproductionandeliminationofROS,leadingtooxidativestress.Antioxidantenzymes,suchassuperoxidedismutase(SOD),areessentialforprotectingcellsfromoxidativedamage.PreviousstudieshaveshownthatalgaecidescancauseanincreaseinSODactivityinalgae(L