擬南芥（Arabidopsis thaliana）等三種被子植物幼苗的結(jié)構(gòu)、發(fā)育和演化分析.pdf

1、中國農(nóng)業(yè)大學(xué)碩士學(xué)位論文擬南芥（Arabidopsisthaliana）等三種被子植物幼苗的結(jié)構(gòu)、發(fā)育和演化分析姓名：畢冬玲申請學(xué)位級別：碩士專業(yè)：植物學(xué)指導(dǎo)教師：汪矛20050601AbstractSeedlingisanimportantstageintheindividualdevelopmentofplantTherearealotofdetailedreportsforthemorphologyandclassificatio

2、nofseedlingbutfewforitsstructure，especiallyfortheinitiation，differentiationandconnectionofprimaryvascularsystem，andtheoccnlTenceandformationoftheorgansThereforethreetypicalplantsincludingArabidopsisthaliana，Pla哆codongran

3、diflorusandLigusffcumjeholensewerechosentostudythespatialandtemporalcharacteriericintheprimaryvascularsystemwhat’smorethedevelopmentalmodeofshootapicalmeristem(SAM)inPlatycodonwasobserved1rhemainconclusionswerethefollowi

4、ng1ThespatialandtemporalcharacterisdcsofvesselelementsintheaxialorgansofArabidopsis，PlatycodonandL堙usacumseedlingswerethatvesselelementsfirstdifferentiatedinthelowerpartofcotyledonnodezone(CNz)，thenextendeddownwardlytohy

5、pocotylandrootandupwardlytothemiddleandupperpartofCN乙andlasflyfinishedtheconnectionwiththeonesinepicotyl‘shootzone2TheinitiatingsiteswerefirstdisclosedinArabidopsisandPlatycodonVesselelementswereinitiatedfirstlyinthelowe

6、rpartofCNZinArabidopsistheninthelowerpartofcotyledon；whileincotyledoninPlatycodon11ledifieFenceofVeSSClinitiatingsitesbetweenthetwoplantswasperhapsduetothedifiefenceintheconcen仃ationandflowofauxin31rheconnectingofCNZande

7、picotylshootzoneinthethreeseedlingsoccurredintwowaysOnewaswasbydeandredifferentiationofparenchyouscellsofthemiddleandupperpartofCNZinArabidopsisandPlatycodon，theotherwasbythedifferentiationofmeristematictissuesinthemiddl

8、eandupperpartsofCNZinLigusacum4ThehaplostelestylesinthelowerpartofcNzofthreeobjectiveplantswerefound，namely，itwasdiarchmesarch，singularandroundinArabidopsis；diarchexarchandlineshapedinPlatycodon，anddiarchmesarchandconcav

9、oconcavejnLigusticum511leveinstylesincotyledonindicatedthatArabidopsisswassimpiepinate—marginvein，andLigusticumjeholenseswasternateforked6ThedynamicdevelopmentofSAMinPlatycodonisdescribedAttheearlystage，SAMhadafewcells，a

10、ndnosubareacouldbeseenFromtheappearanceofthefirstandtheseventhleaf，SAMwascupshaped，andthebaseofSAMwasdividedintospecificcompartmentsThesecompartmentshadthesalnefeaturesasfoundincryptomeriaspmcetypeofSAMofgymnosperm，whose

11、centralcellzonehasfewerandslowlydividedcells。Thereforethezonesuppliedcellsslowlyfoftheperipherymeristemandribbedmeristem，and，too，theleaflandthestemgrewslowlylaterAttheappearanceoftheeighthleafprimordiaSAMformedabulgeandh

12、admorecellsTheresultsnotonlyshowedthevarietyofthestructuresofseedlingsintheirindividualdevelopmentbutalsoprovidedthenewevidenceforevolutionaryanalysisAtthesametimeitcanassistthestudyingofotherseedlingswhenusingphysiologi