美洲黑杨×欧美杨F_1无性系的多性状联合选择  

Research on Growth and Wood Properties Joint Genetic Improvement of New Clones of Poplus deltoides(I-69)×P.euramericana(I-45)

作　　者：管兰华[1,2] 潘惠新[1] 黄敏仁[1] 施季森[1] 

机构地区：[1]南京林业大学林木遗传与基因工程重点实验室 [2]中日合作林木育种科学技术中心,湖北武汉430079

出　　处：《南京林业大学学报（自然科学版）》2005年第2期6-10,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家高技术研究发展计划(863计划)资助项目(2001AA244011)

摘　　要：利用美洲黑杨(I 69杨)×欧美杨(I 45杨)33个F1 无性系第 12 年生数据详细研究了林木生长、木材品质和干形性状联合改良的可行性,并与单性状直接选择进行了比较。通过独立淘汰法可以选择出生长和材积均较优良的无性系;应用指数进行综合选择时,综合性状得到改良,但单个性状的遗传增益比单性状直接选择的增益有所下降;用材积和木材密度两性状构建的指数进行选择,选出的无性系是材积比较大、密度比较高的优良无性系,与独立淘汰法选出的无性系有66.7%是相同的;当用生长性状、木材品质性状和干形性状构建多性状选择指数时,材积经济权重×10 与密度经济权重×10 是两个比较好的指数;按材积经济权重×10进行选择时,虽然木材密度遗传增益很小,但是材积的遗传增益可达 5.14%,指数遗传力为 0.653 5;按照密度经济权重×10进行选择时木材密度可以获得 6.27%的遗传增益而材积几乎没有减少,指数遗传力高达0.702。运用选择指数对多性状进行综合评判和定向选择是切实可行的。The joint genetic improvement of the growth,wood properties and stem form with the data of the 12th year of 33 F 1 clones of Poplus deltoides(I-69)×P.euramericana(I-45) were studied.Superior clones could be selected from the independent knocking-out selection.The aggregate character was improved with selection index,but the genetic gain of single character with selection index was less than that of single character selection.Selected with the index of volume and wood density,the clones with fast growth and high density were bred,which was the same of 66.7% as that was selected with the independent knocking-out selection.Selection index B and D were the good indexes composed of growth,wood quality and stem form.When selected with index B,whose heritability was 0.6535,the genetic gain of wood density was very small,but the genetic gain of volume was 5.14%.However the genetic gain of wood density was 6.27% and the volume was not decreased at all selected through index D with heritability 0.702.It was applicable that the aggregate evaluation and directional selection of multi-characters could be done with selection index.

关 键 词：联合改良 遗传增益 选择指数 定向选择 

分 类 号：S722[农业科学—林木遗传育种]