鋁對甘蔗初生根的脅迫及鈣、硼、鎂的緩解效應.pdf

1、廣西大學碩士學位論文鋁對甘蔗初生根的脅迫及鈣、硼、鎂的緩解效應姓名：譚貴良申請學位級別：碩士專業(yè)：植物營養(yǎng)學指導教師：陸申年顧明華2003.5.1￡耍查璺壅主蘭堡燕蘭————ALUMINUMSTRESSONINITIALROOTSOFSUGARCANEANDTHEALLEVIATINGEFFECTBYCa、B、MgABS善戳警C零Phytotoxicityofaluminum(A1)iswidelyconsideredtObeaseri

2、ousagricultnralproblemlimitingcropproductivityinacidicsoils。TheprimarysiteofAltoxicitylocatesinrootapicesInthisstudytheabilityofAI—toleranceofeightsugarcanecultivarswasidentifiedbyrootelongationmeasuringandhematoxylinsta

3、ining，andtheeffectofAtonrootgrowthofGTl5aswellassomealleviatingeffectbyapplyingCa、B、MgweredeeplyinvestigatedTheresultsshowedthatdifferentsugarcanecultivarsdifferedintolerancetoAIstress，whenTT24andGTl5wereAI—tolerantandA1

4、一sensitivecultivarsrespectively，Inthepresenceof20gmolU1A1，elongationofinitialrootsofGTl5wasseverelyinhibitedThestressofA1alsesultedincurvatureofroottips，anddecreasedthesecretionofmucilageInaddition，AIstresspmmotedtheacti

5、vityofPODandSODinroottip(6、12、24酗A1wasmainlyaccumulatedin010mmsegmentofroottipsThisregionplusepidermisoftheroottipswereintensivelystainedbyhematoxylinButthestressinducedbyAIcouldbealleviatedeffectivelybyCaUnder黼Scircumst

6、ance，elongationofinitialrootsWasonlyrepressedslightlywhereasthealleviatingeffectofBandMg(10mmolL。)wasnotsignificantTheorganicaci(1sseeretedbyrootswerealsodeterminedinthisstudyIncontrasttotheabsenceofAl，rootssecretedmoret