豆科硬實種子形成機理的研究.pdf

1、東北師范大學碩士學位論文豆科硬實種子形成機理的研究姓名：潘睿申請學位級別：碩士專業(yè)：生態(tài)學指導教師：周道瑋20050501A。bstractHardseedsareveryCOIqMTIoninmanyspeciesoflegumesThisthesisfirstlyanalyzedthehardseedformingprocessduringtheseedsdevelopmentofMedicagofalcataLandLespede

2、zadavuricaSchindler；thenafeedingexperimentwithsheep，chickenandquailwasconductedtoinvestigategerminationpercentagechangeof6legumespeciesseedsafteringestionTheresultSshowed：(1)DuringtheseedsdevelopmentofMfalcataLandLdmuric

3、aSchindlerseedsizehasvariedfromsmalltolarge，thenfromgreattosmall；themoisturecontentofseedsdroppedgradually45dafterpeakanthesisdroppedtO69％and103％respectively；freshweightofseedsreachedmaximumpriortodryweight，45dafterpeaka

4、nthesisdryweightandthousand—grainweightofseedsincreasedtotheheaviestandtendedtowardsstability；Theelectricconductivityofseedsdecreasedwithdaysafterpeakanthesisseedsattainedphysiologicalmaturityat45daysafterpeakbloomingThe

5、seedcoatsofMfalcataLandLdavuricaSchindlerhadalayerofpalisadecells，therewasafissureonthehilumsurfaceandthehilumconsistedoftwolayersofpalisadecellsWiththematurityofseeds，thepalisadecellsbecamelongerfromlooselyarrangedturne

6、dintonearlyandtightlyformedwaterimpermeablelayer；andthetwolayersofpalisadecellsofhilumdifferentiatedcompletelylinkedSOcloselythatthefissurewasclosedAt30daysafterpeakanthesisthegerminationpercentageofMfalcataLandLdavurica

7、Schindlerseedsreached705％and80％respectivelyseedvitalityindexandseedgerminationindexwashigherthanotherperiods；thenwiththematurityofseeds，hard—seedpercentageincreasedandexceededtheincreaseofgerminationpercentage，at45daysaf

8、terpeakbloomingreached81％and94％respectively(2)ThestandardgerminationpercentageofseedsrecoveredfromtheanimalfecesWassignificantlyhigherthanthecontrol(P005)，theanimalswithbigsizehadrelativestrongdigestioneffectonseedsVario

9、usdigestioneffectreceivedbyseedsinthebodyofanimalscouldsoftenthehardseedsandimprovedthegerminationpercentageofrecoveredseedsTheingestionofseedsbywildanimalshadpositivefunctiontotheformingofhardseeds：Hardseedcharacteristi

10、cinlegumesmightbeakindofbeneficialbiologicaladaptationwhichdevelopedduringthelongtermcoevolutionwithwildanimals；itisakindofspecialdefensemechanismandhadimportantecologicalsignificanceKeywords：legume；hard—seedforming；seed