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,2016,36(7):1357-1365
犃犮狋犪犅狅狋.犅狅狉犲犪犾.犗犮犮犻犱犲狀狋.犛犻狀.
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犆犺犪狀犵犲狊犻狀犎狅犿狅犵犪犾犪犮狋狌狉狅狀犪狀狊犪狋犇犻犳犳犲狉犲狀狋犈狊狋犲狉犻犳犻犮犪狋犻狅狀犇犲犵狉犲犲狊
犱狌狉犻狀犵狋犺犲犇犲狏犲犾狅狆犿犲狀狋狅犳犅犪狀犪狀犪(犕狌狊犪狊狆狆.犃犃犃)犔犲犪狏犲狊
MAJuan1,FANWei1,LIXiaoquan2,CHENHoubin1,XIELing1,LIUJing1,
WUXi1,YUANMeng1,XUChunxiang1
(1ColegeofHorticulture,SouthChinaAgriculturalUniversity,Guangzhou510642,China;2InstituteofBiotechnology,
GuangxiAcademyofAgriculturalSciences,Nanning530007,China)
犃犫狊狋狉犪犮狋:ForbetterunderstandingthefunctionsandmechanismofPMEsandHGsinthegrowthandde
velopmentofbananaandinthedefenseofbananatothestresses,wetracedthespatialandtemporalabun
danceanddistributionofbananapectinmethylesterases(PMEs)andfivehomogalacturonans(HGs)atdif
ferentmethylesterificationdegrees(MDs)inbananaleavesatdifferentdevelopmentalstagesusingimmu
nofluorescencelabelingtechniques.Inaddition,enzymeactivityofPMEswasalsotested.Theresultsin
dicatedthat:(1)PMEslocatedmainlyinthemesophylandguardcelsintissueculturedbananaseed
lings.BoththelevelandactivityofPMEsdecreasedwiththedevelopmentoftheplant.(2)HGsatdiffer
entMDsalsomainlyappearedinmesophylcelsintissueculturedplantsandtheircontentsreducedgradu
alywiththedevelopmentofplants,thoughthespeedvariedwitheachother.However,thedistribution
oftheseHGsintheepidermis,theguardcelsandtheveinofbananaleavesshoweddifferentialpatterns.
TheMDsofHGspresentintheguardcelswasrelativelyhigh.TheseresultsindicatedthatPMEsandfive
testedHGsweremainlypresentinthemesophyl.Duringthedevelopmentofbananaleaves,thelevelsof
theseHGsshowedsimilartrendtothatofPMEs.
犓犲狔狑狅狉犱狊:banana(犕狌狊犪spp.);homogalacturonan;immunolocalization;leaves;pectinmethylesterase
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Table1 Antibodiesusedinthepresentstudyandtheirsecondantibodies
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Monoclonalantibody
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Antigen
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FITC]^_`v×ØzÙÚ[\ÛÜÝ
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Note:AlantibodiesusedinthepresentstudyexceptPMEwerefromPlantProbes(http://www.plantprobes.net/index.php),UK.Althe
secondantibodieswerefromSigma
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Ep.®Å;GC.ª«¬;LV.Æ;Me.©;Ph.0Å;Sc.¬Ó¦k;Xy.ÎÞ
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A.Tissueculturedseedlings;B,Bagseedlings;C.Inflorescenceemergingplants;DandE.DetailobservationsofC;F.Thexylemof
inflorescenceemergingplants.A,B,D,EandFBar=50μm,CBars=100μm.Ep.Epidermis;GC.Guardcel;LV.Leafvein;
Me.Mesophyl;Ph.Phloem;Sc.Sclerenchyma;Xy.Xylem
Fig.1 Immunolocalizationofpectinmethylesteraseinbananaleavesatdifferentdevelopmentalstages
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Fig.2 TheenzymeactivityofPMEsinbananaleaves
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