紫外線對噬藻體PP的失活及宿主藍藻的光修復作用.pdf

1、華中師范大學碩士學位論文紫外線對噬藻體PP的失活及宿主藍藻的光修復作用姓名：杜秀麗申請學位級別：碩士專業(yè)：微生物生態(tài)指導教師：趙以軍20050501碩士學位論文31AS‘IER’STiSIsAbstractCyanophages，whichdistributedwidelyinaquaticsystem，canspecificallyinfectcyanobacteriasotheyhaveanimportentroleinecolog

2、yTheinfectivityofCyanophagescanbeinfluencedbymanyenvironmentalfactorsTheultraivoletradiationisconsideredasthemainfactoraffectingtheinactivityofcyanophageSoexperimentwascarriedtostudytheinactivityofcyanophagebyultraivolet

3、radiationanditsphotoreactivationbyhostcyanobacteriaResultsareasfollowed：Aftercyanophagewasexposedtosunlightfor3hours，theinactiveratemayreach903％insummerwhilethenumberisonly424％inwinter；after6hours’mdiationtheinactiverate

4、Canreach992％insummerand871％inwinterrespectively；forawholeday’Sradiationtheinactiveratecanbe嬲high舔993％insunlinerand94，l％inwinter1tdemonstratesthatcyanophagecallbeinacfivedbysunlightobviouslyWiththeprolongoftheexposingtime

5、insunlinghtthephotoreaetiveratedecreased：forsamplesuv&nnagedinsummertherepairratesare49％，12％and13％forsamplesexposedtosunlightfor3hours，6hours，and9hoursrespectively；forsamplesUVdamagedinwintertherepairratesare57％，31％and15

6、％forsamplesexposedtosunlightfor3hours6hours，and75hoursrespectivelyItisquiteclearthattherepairrateismuchlowerinsummerthaninwinterneseasonalresearchcarriedoutinfieldconditions①aStLake)demonstrates：theinactiveratedecreasesw

7、ith也eincreaseofdepthandreachesitshi曲estpointas921％insurfacewater(depthis20era)；theinactiverateinsurfacewaterishigherinspringandsummer(921833％)thanthatillautomnandwinter(67jO％)；thephotoreactionrateincreaseswiththedecrease

8、oftheinactivierateaswell∞withtheincreaseoftherepairtime，butthehightestrepairratecannotexceedthe1imitof65％Experimentcarriedoutinsidethelabsuggestthat：IN]concentrationhaSnoeffectonhostcyanobacteria’srepairrate；whilehost’Sr