动物世界里的你争我斗

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1、Exsituconservationofforestgeneticresources:PrinciplesandpracticesRamanathaRaoGeneticresourcesGenotypesorpopulationsCultivarsGeneticstocks,&Relatedwild&weedyspeciesConservationSpecieslevelGenepoollevelorEcosystemlevelhttp://www.hygy1688.com衬塑复合管涂塑复合

2、管钢塑复合管消防涂覆钢管http://www.u51688.comExSituConservationhastotakeintoaccountBiologicalfactorsofthespeciesBreedingsystemsProductionofseedsNatureofseedsSeedsizeandvolumeManagingtheFGRgenebanksCollectingMonitoringstorageconditionsViabilitymonitoringRegenerati

3、onandmultiplication,CharacterizationandevaluationDocumentationandinformationDistributionforuseFieldgenebanks(FGB)/Arboreta/ExSitustandsSomeproblemsDamagedbynaturalcalamitiesInfectionNeglectorabuseSubstantialno.ofindividualgenotypesRequiremorespaceRela

4、tivelyexpensivetomaintainHoweverProvideeasy&readyaccessAlternativemethodsareyettobedevelopedMajorroleforperennialspeciesConservationofPlantsSeedcollectionAtleast150treesiftheirrelationshipisunknownSeedshouldbecollectedfromatleast25randomlychosenands

5、upposedlyunrelatedindividualsAimforfinalstandsizeof500-1500individualsormoreThedifferentnumbersarebasedonpopulationgeneticconsiderationsConservationofPlants–FGB(contd.)ImportantconsiderationsEstablishmentofseedlingsSamplingtechniquesNumberofplantsSecu

6、rityofsiteReplication/duplicationAdaptationSizeoftheplotPestsanddiseases/naturalcalamitiesIsolationEaseofaccessConservationofPlants–FGB(contd.)ConservationofTissues/CellsDifficult-to-conservespeciesRecalcitrantseedsVegetativelypropagatedLargeseedsFor

7、somespeciestheonlyoptionCryopreservationRapidprogressmadeGreatpotentialforconservationInvitroconservation:security,availability&costForthelong‑termconservationofshootculturesCryopreservationinLN2becomingavailableOtherrolesDistributionofgermplasmColl

8、ectingofsamplesfromthefieldNeedtokeepculturegrowthtoMinimumorarrestedConservationofTissues/Cells(contd.)WaystoachieveslowgrowthUseofimmaturezygoticembryos(notforvegetativelypropagatedspecies)AdditionofinhibitorsorretardantsManipulatingstorage