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   配合力效应 在 林业 分类中 的翻译结果: 查询用时:0.656秒
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  combining ability effects
    Discussions on the analysis models of diallel and combining ability effects were made.
    并就双列交配设计的分析模型以及配合力效应问题进行了讨论。
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This paper reports on the results of a study of a diallel crosses system of six parents (including selves) of Chinese fir. Materials for tests came from a breeding population of plus tree clones in Fujian. Characters measured in the study were height (H), diameter at the root collar (D. R. C.) , total number of branches (T. N. B.), number of whorls of branches (N. W. B.) and length of the longest branch (L. L. B.) on a seedling. Heterosis of hybrid progenies was calculated in terms of 100% (Fi-best parent)/best...

This paper reports on the results of a study of a diallel crosses system of six parents (including selves) of Chinese fir. Materials for tests came from a breeding population of plus tree clones in Fujian. Characters measured in the study were height (H), diameter at the root collar (D. R. C.) , total number of branches (T. N. B.), number of whorls of branches (N. W. B.) and length of the longest branch (L. L. B.) on a seedling. Heterosis of hybrid progenies was calculated in terms of 100% (Fi-best parent)/best parent, which is similar to the formula used by Bahman (1975) and Pashall (1975), et al. and selfing depression was estimated with reference to the method used by Kheradnam, et al. (1975) Open-pollination progenies were used as genetic controls. Using Griffing's (1956) Method I, Modelll (fixed model), estimates of general and specific combining ability and reciprocal effects were obtained. Relationships between the superior effect of the crosses and the combining ability effect of parents, between the selfing effect and the general combining ability of parents were analysed. Patterns for genetic controlling of characters of parents were also studied. With the genetic components of the variances estimated by Griffing's (1956) method I, model II (random model), family and individual heritabilities in both broad and narrow senses were estimated respectively. The major results of this study are as follows:

本文报道杉木6个优树无性系完全双列交配设计苗期试验部分结果,叙述了对苗高等五个性状所作的测定和分析,评价了各交配组合的杂种优势表现,阐述了各交配组合的优势效应同亲本配合力之间的关系,以及测定性状苗期的遗传控制方式,并估算了各性状的遗传力。此外,还对杂种优势的评定方法、杉木亲本自交表现与其配合力的关系、杉木的遗传改良方案等问题进行了讨论。试验的主要结果如下,1、在第一代种子园亲本间再行控制杂交,能进一步获得具有显著优势效应的杂交组合,供第二代选择。2、交配组合杂种优势水平与构成该组合双亲的配合力效应值大小和正负方向有关。3、配合力方差分析表明,所测定性状(除地径外)的一般配合力、特殊配合力及正反交效应方差,均达1%显著水平。4、苗高的为0.74,分枝总数为0.34,分枝轮数为0.43,最长侧枝长度为0.11。5、自交不衰退的个体表现为具有较高的一般配合力效应

This article reported part of experimental results of complete two-way cross design of 5 varieteis (clonal) of Tungoiltree (Vernicia fordii), response of combining ability on oil output of every cross was analysed, heritability and percentage of G. V. C. were estimated. 1. Response of general combining ability on oil output of 5 varieties was not notable but special combining ability and reciprocal cross response were remarkable, the reciprocal cross response was absolute predominance (G. V. C.%=75%), h~2B of...

This article reported part of experimental results of complete two-way cross design of 5 varieteis (clonal) of Tungoiltree (Vernicia fordii), response of combining ability on oil output of every cross was analysed, heritability and percentage of G. V. C. were estimated. 1. Response of general combining ability on oil output of 5 varieties was not notable but special combining ability and reciprocal cross response were remarkable, the reciprocal cross response was absolute predominance (G. V. C.%=75%), h~2B of composition and single plant reached respectively 82.67% and 48.82% 2. Dominance composition for oil output were 3×8, 3×15, 08×0, 8×0 and 3×0, the hereditary gain was 35.48% and that of optimum composition could reach 54.49%.

本文报导了油桐5个品种(无性系)的完全双列交配设计的部分试验结果,分析了各杂交组合产油量的配合力效虚,并估算了遗传力和G·V·C%。1.5个品种产油量的一般配合力效应不显著,但特殊配合力和正反交效应均达到极显著水平,而且正反交效应占绝对优势(G·V·C%=75%),组合和单株的h~2B分别为82.67%和48.82%。2.产油量的优势组合是3×8、3×15,08×0、8×0和3×0,其遗传增益为35.48%,其中最优组合的遗传增益为54.49%。

121 crosses of Chinese fir (Cunninghamia lanceolat Hook. ) aged 3 or 4 were examined for their germination percentage on nursery bed,variations in height,diameter,volume and crown,amd their combining ability, heterosis and genetic control. Individual and family heritabilities were calculated for the growth traits. Most of the variation was attributed to the within-plot effects,and the significant effects of environment and genotype by environment interaction were observed. Dominance effects were predominant...

121 crosses of Chinese fir (Cunninghamia lanceolat Hook. ) aged 3 or 4 were examined for their germination percentage on nursery bed,variations in height,diameter,volume and crown,amd their combining ability, heterosis and genetic control. Individual and family heritabilities were calculated for the growth traits. Most of the variation was attributed to the within-plot effects,and the significant effects of environment and genotype by environment interaction were observed. Dominance effects were predominant in the genetic control of height growth as suggested by the results from a diallel test. Expression of both the combining a-bility and the heterosis exhibited some complexity. High selfing depression occurred in the germination percentage and in the seedling height. Seven parent clones expressing superior general combining ability in tree height have been selected,and 13 crosses showing greater positive heterosis in tree height that averaged 12. 85% as compared with a control representing all the open-pollinated progenies within the seed orchard involved.

对林龄3或4年的杉木121个杂交组合,分析了种子场圃发芽率以及高、径、材积、冠幅的变异原因、配合力效应、杂种优势效应及遗传控制方式,并估算了生长性状的家系和单株遗传力。结果表明:小区内个体间差异是性状变异的主要原因,环境及遗传型×环境交互作用的影响也十分显著;双列杂交组合的高生长性状在遗传上主要是受基因显性效应的影响;生长性状配合力效应及杂种优势的表达都十分复杂;种子场圃发芽率及苗高的自交衰退非常严重。选出7个树高一般配合力表现优良的亲本,以及13个树高超群杂种优势平均12.85%的优良杂交组合。

 
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