氮及光对微囊藻和鱼腥藻浮力调节的影响--硕士论文

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1、j、』．。。。，、．．—曩-————竺竺兰一1Il＼驯IlllIlI必IIIIII嬲-■i薯—i_

2、_____——毒ii—-_——宣i童—i毒I—置■__皇ii鼍_薯i_l}lll川川⋯IllllI型叫Il型AbstractSpeciesofMicrocystisaeruginosaandAnabaenaspiroidesaretypicalbloom·formingcyanobacteriainChinesewaters．Cyanobacteriahavegasvesicle．Vesiclecont

3、ainsagas—filledspace．Theyprovidebuoyancybyloweringthedensityofthecells．Cyanobacteriahavetheabilitytoregulatetheirownbuoyancy．Themechanismofbuoyancy-isacoreissueonalgaebloom．Buoyancyregulationandthefactorsthataffectbuoyancyofthethreecyanobacterialstrains

4、werestudiedwithbatchcultureexperiments．Photosynthesisandcellmorphologywerealsostudiedcellulargasvesicleswerecollapsed．1．Theeffectsofgasvesiclesonthegrowthcharacteristicsofthethreecyanobacterialbm'ainswerestudiedwhichcollapsedandun-collapsedgasvesiclecya

5、nobacteriawereused．Growtheffectsunderthecollapseofgasvesicleswerelittleamongthethreecyanobacterialstrains．Andgasvesicleswouldbere．formationwithin3-5daysinthesestrains．2·Theeffectsofnitrogen—limit,tightintensityandirradiationtimeongasvesicle．Itshowedthat

6、gasvesicleformationwashinderedundernitrogen．1imitincubatedcomparingwithsufficientnitrogenandphosphorus．M．aeruginosaalmostlossbuoyancyoffloating．IncreaseoflightintensityhadnoinfluenceonthereformationofgasvesicleofM．aeruginosa．HoweverthegasvesicleofA．spir

7、oidesinprevious(¨1d)reformedslowly，andrapidlyinthe3--5d．ThereformationofgasvesicleWasfaster0~1d，anddeclined0in3—5dwithhighlight．BothoftherelativevolumeofgasvesicleofM．aeruginosaandA．spiroideswashigherunder4hlightand48hdarkthanthatunder48hdark．Theresults

8、suggestthatgasvesicleformationinthedarkisdependentonprioracculationofenergyreserves．3·Thegasvesiclevolume，thecontentofproteinandcarbohydratein肱-11．_，；；^bstractaeruginosa，A．spiroidesvariedslowlyatacycleoflight／non—light．Thefirsttwochangedlittle．Theconten

9、tofcarbohydrateofM．aeruginosaincreasedfrom8．79x10‘8岖·cell‘1to1．30×10-7鹇·cellq．AndthechangesoffloatpercentofM．aeruginosathesameasthatofbuoyancybycarbohydrate．Theresultshowedthatthebuoyancyregulationdependonthecarbohydratesynthesis