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1、热带亚热带植物学报 2014,22(3):270~280JournalofTropicalandSubtropicalBotany红锥家系遗传变异与优良家系选择1,2,31,2,3*1,2,341,2,31,2,3朱积余,申文辉,蒋燚,卢立华,谭一波,刘秀(1.广西壮族自治区林业科学研究院,南宁530002;2.国家林业局中南速生材繁育重点实验室,南宁530002;3.广西优良用材林资源培育重点实验室,南宁530002;4.中国林科院热带林业实验中心,广西凭祥532600)摘要:为选择红锥(Castanopsishystrix)优良家系,对2–11年生红锥家系的生
2、长性状和遗传参数进行了研究分析。结果表明,家系间在树高、胸径和单株材积上的差异达显著或极显著水平,家系的树高、胸径和单株材积受中等或中等以上遗传控制,具有很强的家系和家系内单株选择潜力;家系的单株材积变异幅度较大,胸径居中,树高的较小,显示出红锥家系间存在着丰富的变异;家系和单株遗传力随林龄的增大逐渐变小,到7–9年生时逐渐稳定。年度生长性状的相关分析表明,树高、胸径和单株材积的遗传相关系数随林龄逐渐增大,到7年生时最大,分别达到0.9602、0.9340和0.9849,之后趋于稳定,因此,7年生可作为早期选择的适合年龄。结合早期选择及形质指标,11年生时最终选择
3、出优良家系10个,其平均树高、胸径和单株材积分3别为13.95m、14.34cm和0.1229m,平均遗传增益分别为12.24%、18.69%和51.59%,其通直度、圆满度、分枝角度、最大分枝、冠幅、枝下高等形质指标也提高7.71%~12.94%。关键词:红锥;家系;遗传变异;选择doi:10.3969/j.issn.1005–3395.2014.03.009GeneticVariationandSuperiorFamilySelectionofCastanopsishystrixFamilies1,2,31,2,3*1,2,341,2.31,2,3ZHUJi-
4、yu,SHENWen-hui,JIANGYi,LULi-hua,TANYi-bo,LIUXiu(1.GuangxiAcademyofForestry,Nanning530002,China;2.GuangxiKeyLaboratoryofSuperiorTimberTreesResourceCultivation,Nanning530002,China;3.KeyLaboratoryofCentralSouthFast-growingTimberCultivation,Nanning530002,China;4.ExperimentalCenterofTropic
5、alForestry,ChineseAcademyofForestry,Pinxiang532600,China)Abstract:InordertoselectsuperiorfamiliesofCastanopsishystrixinsouthernChina,thegrowthtraitsandgeneticparametersofC.hystrixfamiliesatagesfrom2to11yearswerestudied.Theresultsshowedthattheaverageheight,diameteratbreastheight(DBH)an
6、dwoodvolumeamongfamilieshadsignificantdifferences.Theaverageheight,diameterandwoodvolumegrowthoffamiliesweregeneticcontrolledatmediumlevelorabove,whichindicatedhighselectionpotentialamongorwithinfamilies.Woodvolumehadlargevariationamongfamilies,followedbyDBHandheight.Familyheritability
7、andindividualheritabilitygraduallydecreasedwithageincreasing,andstabilizedat7-to9-year-old.Thegeneticcorrelationcoefficientofgrowthtraitsgraduallyincreasedwithageincreasing,andreachedmaximumat7yearsoldandthentendedtostable.Thegeneticcorrelationcoefficientsofplantheight,DBHandwoodvolumew
8、ere0.