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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。
In this paper, we report the results of the seedling experiment of the complete double crosses of six elite tree clones in China, and describe the measurement and analysis of the five traits of seedling height, evaluate the heterosis performance of each mating combination, The relationship between dominant effect and parents’ combining ability, and the genetic control of seedling traits at the traits, and the heritability of each trait was estimated. In addition, the methods of assessing heterosis, the relationship between selfing of Chinese fir and its combining ability and the genetic improvement program of Chinese fir were also discussed. The main results of the experiment are as follows: 1. Control hybridization between first-generation seed orchard parents can further obtain hybrid combinations with significant advantages for second-generation selection. The level of heterosis in mating combinations was related to the size and positive-negative direction of combining ability of the parents. The analysis of variance of combining ability showed that the general combining ability, special combining ability and the variance of reciprocal and reciprocal effect of tested traits (except ground diameter) reached 1% significant level. 4, seedling height was 0.74, the total number of branches was 0.34, the number of branches was 0.43 and the length of the longest branch was 0.11.5. The individuals with self-fertility did not show the effect of general combining ability.