自毒物質對西瓜根系形態(tài)結構及細胞保護酶的影響.pdf

1、中國農業(yè)大學碩士學位論文自毒物質對西瓜根系形態(tài)結構及細胞保護酶的影響姓名：孫會軍申請學位級別：碩士專業(yè)：蔬菜學指導教師：王倩20030501AbstractAutotoxicityisoneoftheimportantfactorsthatresulttomonocultureBenzoicacidandcinnamicacidaretWOmainautotoxinsThisresearchworkconcernsontheeffect

2、ofbenzoicacidandcinnamicacidonwatermelonradicleultrastructureandseedingrootcellprotectiveenzymesTheresultsareasfollows：Benzoicacidandcinnamicacidsignificantlyinhibitedwatermelonradicleselongation，andwiththeincreasingofbe

3、nzoicacidandcinnamicacidconcentration，thegrowthspeeddecreasedTheradicleswereshort，moresideroot，androottiptissuebecamebrownishThroughtheobservationtotheradicle’SultrastructureitWaSfoundthatbenzoicacidandcinnamicacidcanres

4、ulttoroottipnucleiirregularnucleolusabnormal，andcytoplasmsparseVacuolesbecamemoreandbiggerBenzoicacidandcinnamicacidsignificantlyinfluencedcellprotectiveenzymesofwatermelonseedingrootandtheeffectsaredistincttodifferenten

5、zymesandconcentrationsBenzoicacidandcinnamicacidreducedperoxidase(POD)activityandwiththetreatedconcentrationincreasing，peroxidase(POD)activitycontinuouslyreducedEffectsonsuperoxidedismutase(SOD)aetivityexpresseddoublefun

6、ctionsofpromotionandcontrol：Superoxidedismutase(SOD)activityincreasedatlowphenolicacidsconcentration，butdecreasedwhentheconcentrationWashigherTonitratereductaseO諏)activityonlycinnamicacidexpresseddoublefunctionsofpromoti

7、onandcontr01NRactivitycouldbeincreasedatlowcinnamicacid，butbedecreasedunderhigherconcentrationBenzoicacidcouldn’tpromoteNRactivityevenunderlOWconcentrationEffectsofbenzoicacidandcinnamicacidonplasmamembraneHATPaseactivit

8、ywascomplicate：reducedatfirstunderlowconcentration(0500mmol／L)EffectsonPOD，SOD，NRactivitybenzoicacidtreatedwasmoresignificantthancinnamicacidtreated，buttoplasmamembraneHATPaseactivitytheeffectsofcinnanaicacidtreatedwasmo

9、resignificantthanbenzoicacidtreatedBenzoicacidandcinnamicacidincreasedmembranepermeabilityofwatermelonseedingrootWiththeconcentrationincreasing，therelativeconductanceratecontinuouslyberaised，andtheincreasingdegreeofbenzo