简介：Paulowniaisafast-growingtreespeciesthatismainlyfoundinthecentralpartofChina.ThreemaincultivationareasofPaulowniaaretheYellow-Huai-HaiPlain,southoftheYangtzeRiver,andaridandsemi-aridareasofNorthwesternChina.Thereare9species,4varietiesand4formsusedintheproductioninChina.Studyachievementswereobtainedinthefieldsofspecies/varietyintroduction,selectionandbreeding,afforestationtechniquesaswellasthecontrolofdiseasesandpests.Themainproblemsexistinginthecurrentproductionincludelackofimprovedvarieties,mix-upofdifferentvarietiesandvarietydegenerationduetothelongcourseofasexualreproduction.Theauthorputforwardcountermeasuresfortheproblems.

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简介：Inordertoprobethedeathreasonofterminalbudsandcarryouttrunkextensionbyusinglateralbuds,thetemperaturecharacteristicsofdormancydevelopmentofterminalandlateralbudsinPaulowniatomentosaxp.fortunei33wereinvestigatedbyraisingcuttingbranchesondifferentdateat25℃and15℃.Theresultswereasfollows:①Thedeathreasonofterminalbudsandthefirstpairoflateralbudswasitselfecologicaladaptingstrategy,nottheinjuryofearlyfrostandfreezing;②Thelateralbuds2,3and4hadobtainedthefeatureofwinterdormancy,andcouldsurvivefromcoldwinter,andwidenitspossibletemperaturerangeofsproutingtolowertemperaturebyexperiencingwinterchilling;③Thelateralbuds2,3and4couldsproutatthesametimeinspring,butitwasdifficulttosproutforotherlateralbuds;④Thesproutingofupperlateralbudscouldrestrictthesproutingoflowerlateralbudsat25℃,butnotat15℃.

简介：Thispaperaimstoconfirmtheoptimalpruningintensitytopromotepaulowniagrowth.Annualdynamicof8growthindicatorsforpruningofthree-year-oldPaulowniatopromotetnmkextensionweresimulatedunder7treatments.TheresultsshowedthatannualgrowthprocesscouldbemodeledreliablybyRichards'function.Eightgrowthparametersweredevelopedincludingfast-growingpoint(t0),initialpointoffast-growingperiod(tl),finalpointoffast-growingperiod(t2),fast-growingperiod(t),growthperiod(Dg),maximumdayincrement(AGRmax),maximumannualincrement(A).Effectsofpruningtopromotetrunkextensionongrowthparameterswereanalyzed.Paulowniaremaining3-6lowerbranchesafterpruninghadrelativelylongerfast-growingperiod(t),growthperiod(Dg),higheraveragedayincrement(Am),maximumdayincrement(AGRmax)andmaximumannualincrement(A).Therefore,lowerdiametergrowthoforiginaltrunkdidnotdecreasesignificantly,andupperdiametergrowthincreasedtosomeextent,Heightanddiametergrowthofgraftingtrunk,andformratioofgraftingtrunkwererelativelyhigher.Totalstockvolumeincrementwasimprovedsignificantlyundertheconditionthatstockvolumeincrementoforiginaltrunkdidnotdecrease.

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简介：ThefruitsofPaulowniacatalpifoliaGongTongareusedasaChinesefolkherbalmedicineforthetreatmentofenteritis,tonsillitis,bronchitis,anddysentery,etc.OurpreviousstudyhasidentifiednewC-geranylatedflavanoneswithobviousanti-proliferativeeffectsinlungcancerA549cells.Inthepresentstudy,anewC-geranylatedflavone,paucatalinoneC(1)andfiveknownC-geranylatedflavanones(2-6)wereisolated.Inaddition,atotalof34C-geranylatedflavonoidsweredetectedbyHPLC-DAD-ESI-MS/MScouplingtechniquesfromtheCH_2Cl_2extractofP.catalpifolia.Futhermore,anti-agingeffectsofisolatedcompoundswereevaluatedinvitrowithprematuresenescent2BScellsinducedbyH_2O_2.PhytochemicalresultsindicatedthatP.catalpifoliawasanaturalresourceofabundantC-geranylatedflavonoids.Diplacone(3)andpaucatalinoneA(5)werethepotentanti-agingagentsintheprematuresenescent2BScellsinducedbyH_2O_2andtheC-geranylsubstituentmaybeanimportantfactorbecauseofitslipophiliccharacter.