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1、廣東農(nóng)業(yè)科學(xué)2014年第17期47大葉櫟家系水平性狀變異及優(yōu)良家系選擇研究李榮麗,黃壽先,李志先,周傳明,何長虹,李龍梅,唐國強(qiáng)(廣西大學(xué)林學(xué)院/國家林業(yè)局中南速生材繁育重點(diǎn)實(shí)驗(yàn)室,廣西南寧530004)摘要:對大葉櫟半同胞家系生長性狀的遺傳變異進(jìn)行了研究,結(jié)果表明:除了冠徑比外,樹高、胸徑、單株材積、冠幅和冠高比家系間差異極顯著,且家系遺傳力都在0.50以上,說明家系間具有良好的選擇潛力;大多性狀間的表型相關(guān)和遺傳相關(guān)呈極顯著或顯著的正相關(guān),有利于對多性狀進(jìn)行綜合選擇,構(gòu)建的綜合選擇指數(shù)方程為I=8.9527X.+2.9906X2+2111.676
2、2X3+6.1398X4—9.3236X5;按10%的入選率選出2個(gè)優(yōu)良家系,與家系平均值比較,樹高、胸徑、材積、冠幅、冠高比和冠徑比的平均遺傳增益分別為14.18%、23.33%、45.24%、23.25%、6.72%、一0.67%,與對照相比。以上性狀的平均遺傳增益分別為2O.55%、28.89%、48.92%、21.97%、5.16%、一3.91%。關(guān)鍵詞:大葉櫟;半同胞家系;生長性狀;遺傳變異;綜合選擇中圖分類號:$792.18文獻(xiàn)標(biāo)識碼:A文章編號:1004—874X(2014)17—0047—04Variationoftraitsamon
3、gCastanopsisfissafamiliesandselectionofsuperiorfamiliesLIRong—li,HUANGShou-xian,LIZhi—xian,ZHOUChuan—ming,HEChang-hong,LILong-mei,TANGGuo-qiang(ForestryCollegeofGuangxiUniversity~KeyLaboratoryofFast-growingTreeBreedinginCentralSouthChino,StateForestryAdministration,Nanning53000
4、4,China)Abstract:Inthispaper,thegeneticvariationongrowthtraitsofaCastanopsisfisahalf—sibfamilyplantationwerestudied.Theresultsshowedthattherewereextremelysignificantdifferencesamongfamiliesonthetreeheight(H),diameteratbreastheight(DBH),individualtreevolume(V),crowndiameter(CD)a
5、ndtheratioofcrowndiametertoH(RCDH),exceptfortheratioofcrowndiametertoDBH(RCDDBH).Thefamilyheritabilityofalltraitswerehigherthan0.50,itindicatedthatanextensiveselectionpotentialexistedamongfamilies.Forthegiventraits,manyofthemhadsignificantpositivephenotypicandgeneticcorrelation
6、samongeachother,whichwasfavorableforthecomprehensiveselectionwithmulti-traits.Onthebaseoftraits-combiningselection,aselectionindexequationwasintroduced(I=8.9527Xl+2.9906X2+2111.6762X3+6.1398)(4—9.3236X5).Attheselectionrateof10%,twosuperiorfamilieswerechosen.Comparedthetraitmean
7、oftwoselectedfamilieswiththatofplantation,theexpectedgeneticgainsonH,DBH,V,CD,RCDH,andRCDDBHwere14.18%,23.33%,45.24%,23.25%,6.72,and一0.67%.Moregeneticgainswereexpectedwhencomparedthetraitmeanofselectedfamilieswiththatofcontrol(CK),theexpectedvalueswere20.55%,28.89%,48.92%,21.97
8、%,5.16%,and-3.91%,respectively.Keywords:Castanopsissa;