1、安徽農業(yè)大學碩士學位論文輻照降解殼聚糖對小麥幼苗抗旱的生理生化特性影響的研究姓名：劉婷申請學位級別：碩士專業(yè)：生物物理學指導教師：王榮富趙永富20080601AbstractAsamajorcrop，wheatisplantedabroadintheworld111eeffectofdroughttowheatisseriouslyChitosanisakindofaminoploysacchafidesderivedfromchiti

2、nbydeacetylatingInrecentyears，chitosanhasbeeninvestigatedandusedabroadasnon—contaminationpesticideandgrowthregulatorinagriculturalareaTllisexperimentWasconducted、析mdroughtlightresistantwheatcultivarwr觚NO46anddroughtresis

3、tantwheatcultivarHanxuanNO10，irradiatedchitosanwiththreekindsofdose(50kGy、200kGy、500kGy)acetumWasdealtwimthewheatseedsandWasprayedontheleavesofwheatseedlingsrespectivelythenobservedthephysiologicalandbiochemicaleffectofi

4、rradiatedchitosanondroughtresistanceofwheatTheresultsshowedthat：111ethreekindsofchitosansolutioncouldimprovethegerminationpercentageofseed，moisturepercentageofseedling，thedryweightofroot，ratioofroottoshootoftwokindsofwhe

5、atcomparedwiththecontrol，butincreased塒mdifferentdegreeChitosanwith200kGydosetreatmenthasgreateffectontheseedlingshapecharacterofwheatW鋤NO46thananothertwotreatmentsInaddition，chitosanwith50kGydosetreatmenthasgreateffecton

6、theseedlingshapecharacterofwheatHanxuanNO10111ephysiologicalandbiochemicalindexsofwheatseedlingsweremeasured，theresultsindicatedthat：Duringthewholestageofdroughtstress，forthewheatWanNO46seedlingstreatedbychitosanwim200kG

7、ydoseandthewheatHanxuanNO10seedlingstreatedbychitosanwith50kGy，thesolubleproteincontentsandthecontentsofchlorophyllwereincreasedremarkablycomparedwiththecontrol(P005)，thecontentsofmalondialdehyde(MDA)weredecreasedobvious

8、ly(PO05)Theactivitiesofantioxidasessuchassuperoxidedismutase(SOD)，peroxidase(POD)andcatalase(CAT)wereincreasedsignificantlycomparedwiththecontrol(P001)，whichcouldmaketheperformanceperiodlastmorethan7daysTllisstudyindicat

9、edthatirradiatedchitosanWascapableofimprovingtheabilitytoeliminatereactiveoxygenspecies，protectingthefunctionsofbio—membrane，raisingthephysiologicalsynergismsindroughtresistanceofwheatseedlingsKeywords：chitosan，wheatseed