学科分类
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3 个结果
  • 简介:Homeoboxtranscriptionfactorsparticipateinthegrowthanddevelopmentofplantsbyregulatingcelldifferentiation,morphogenesisandenvironmentalsignalresponse.Torevealthefunctionsofthesetranscriptionfactorsinrice,weconstructedtheRNAivectorsofOsHox9,amemberofhomeoboxfamily,andanalyzedthefunctionofOsHox9usingreversegenetics.TheplantheightandtilleringnumberofRNAitransgenicplantsdecreasedcomparedwiththoseofwild-typeplants.Reversetranscription-polymerasechainreactionanalysisshowedthatOsHox9expressionreducedinthetransgenicplantswithphenotypicvariance,whereasthatinthetransgenicplantswithoutphenotypicvariancewassimilartothatinthewild-typeplants.ThisresultsuggeststhatthephenotypesofthetransgenicplantswerecausedbyRNAieffects.Thetissue-specificityofOsHox9expressionindicatedthatitwasexpressedindifferentorgans,withhighexpressioninstemapicalmeristemandyoungpanicles.SubcellularlocationofOsHox9demonstratedthatitwaslocalizedonthecellmembrane.

  • 标签: 转录因子 同源盒 遗传分析 家族 水稻 转基因植物
  • 简介:Prestackreversetimemigration(RTM)isanaccurateimagingmethodofsubsurfacemedia.TheviscoacousticprestackRTMisofpracticalsignificancebecauseitconsiderstheviscosityofthesubsurfacemedia.OneofthestepsofRTMissolvingthewaveequationandextrapolatingthewavefieldforwardandbackward;therefore,solvingaccuratelyandefficientlythewaveequationaffectstheimagingresultsandtheefficiencyofRTM.Inthisstudy,weusetheoptimaltime-spacedomaindispersionhigh-orderfinite-difference(FD)methodtosolvetheviscoacousticwaveequation.Dispersionanalysisandnumericalsimulationsshowthattheoptimaltime-spacedomainFDmethodismoreaccurateandsuppressesthenumericaldispersion.Weusehybridabsorbingboundaryconditionstohandletheboundaryreflection.Wealsousesource-normalizedcross-correlationimagingconditionsformigrationandapplyLaplacefilteringtoremovethelow-frequencynoise.NumericalmodelingsuggeststhattheviscoacousticwaveequationRTMhashigherimagingresolutionthantheacousticwaveequationRTMwhentheviscosityofthesubsurfaceisconsidered.Inaddition,forthewavefieldextrapolation,weusetheadaptivevariable-lengthFDoperatortocalculatethespatialderivativesandimprovethecomputationalefficiencywithoutcompromisingtheaccuracyofthenumericalsolution.

  • 标签: REVERSE time migration Viscoacoustic Optimization Adaptive