采穗园母株生根性状遗传变异和选择效应  

VariationinRootingAbilityofCuttingsandSelectiveEffects among Ortets in A Japanese LarchCuttingGarden ──ACaseStudy

作　　者：王笑山[1] 郑先武[1] 王建华[1] 许传森[1] 王有才 杨焕君 

机构地区：[1]中国北京林业科学研究院林业研究所,辽宁省清原县大孤家林场

出　　处：《林业科学研究》1995年第1期48-53,共6页Forest Research

基　　金：1991~1995年世界银行贷款国家造林项目"落叶松丰产培育技术与推广"课题

摘　　要：对３．５年生日本落叶松采穗园４个家系４０株母株生根率、生根量和偏根率遗传变异，不同生根性状间表型相关研究表明，家系间生根率、生根量和偏根率差异尚达不到０．０５的显著水平。但不同母株间上述差异均极显著。单株生根率、生根量等的遗传力大于家系，方差分量分别比家系大４～３６倍。部分家系生根率与生根量、偏根率之间相关关系紧密程度不同，但生根量与偏根率之间各家系均呈极显著负相关。根据生根率、生根量综合评价结果，按５０％入选率对采穗园进行淘汰，或用生根性状优异的母株扦插苗建第二轮采穗园，插穗生根率、生根量比总体利用水平可分别提高２０．３％和２９．８％，而又不致严重减少采穗园母株的遗传多样性。Variation of rooting percentage,number of root per cutting,one side rootingpercentage and correlativities of phenotypes between different rooting characters of cuttingscollected from 3.5-year-old ortets were studied in a Japanese larch[Larix kaempferi(Lamb.)Carr. ]hedged cutting garden,which was established by planting seedings of half-sib families. Selection of ortets with superior rooting ability were also done based on thecombined value of rooting percentage and number of roots per cutting in average. The re-search showed that there was wide range of variation in different rooting parameters amongcuttings taken from the different families and ortets,but significant variations can only befound among cuttings taken from different ortets. The heritahility of ortets was more impor-tant than that of the family in rooting percentage,average number of roots per cutting andthe rate of One side rooting. The significances of correlativity of rooting parameters varied a-mong different families. Significant negative correlativity was found hetween the rootingnumber per cutting and one-side rooting percentage. However,significance of correlativitybetween rooting percentage,number of root per cutting,and one-side rooting percentage var-ied among some families. According to the results of the combined selection,routing out50%of ortets which showed lower rooting ability from the garden,or forming new secondcircle garden by using rooted cuttings of 50%selected ortets,rooting percentage and rootnumbers would increase 20%and 28.6%respectively without obviously reducing genetic di-versity of the hedged garden.

关 键 词：日本落叶松 采穗园 生根率 遗传力 

分 类 号：S791.223[农业科学—林木遗传育种] S723.132.1[农业科学—林学]