Understandinggeneticvariationisimportantforefficientlyselectingexcellentclonesandutilizinggeneticresourcesduringtreebreeding.Weinvestigated16growthtraitsof5032-year-oldPinuskoraiensisclones.Analysesofvarianceshowedthatallthetesttraitsdifferedsignificantlyamongclones.Averageheight,diameteratbreastheight(DBH),andvolumeofallcloneswere10.41m,21.30cm,and0.148m3,respectively.Phenotypiccoefficientsofvariationandrepeatabilitiesoftraitsrangedfrom4.37to48.03%andfrom0.013to0.900,respectively.Thereexistssignificantpositivecorrelationsamongheights,diameteratdifferentheights(1.3,3.0,5.0m),andvolumes;geneticcorrelationwasclosetophenotypecorrelation.Usingfourgrowthtraits(height,DBH,volume,averagecrownwidth)asindicesforacomprehensiveevaluation,fiveclones(PK11,PK19,PK04,PK14,andPK28),whosetraitsscoredinthetop10%,wereselectedaseliteclones.Fortheseclones,geneticgainsinheight,DBH,volumeandcrownheightwere8.58,13.02,32.72and3.83%,respectively.TheseresultsprovideimportantinformationforimprovingP.koraiensisbreedingprograms.
