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对两套杉木亲本在种源和个体两水平的双列杂交试验进行了遗传分析。其中试验A选取的亲本材料主要来自于杉木的中心产区 ,主要生长性状经过了一般配合力测定 ,具有较高的遗传改良水平 ;试验B选取的亲本材料大部分来自于杉木的边缘产区 ,遗传改良程度较低。配合力分析结果表明 :杉木种源间杂交组合生长量存在显著的遗传差异 ,主要受一般配合力效应的影响 ;在个体水平上 ,试验A中一般配合力方差小于特殊配合力方差 ,试验B中则相反。因此在杉木生长性状的遗传改良中 ,一般配合力和特殊配合力具有相对的重要性 ,对于已经过一般配合力测定的材料 ,要加强特殊配合力的测定 ,而对于未经过一般配合力测定的材料 ,则其一般配合力的测定比特殊配合力的测定更重要。
Genetic analysis was conducted on the two-line crosses between two provenances of cunninghamia lanceolata and two individuals of Chinese fir. The parent material selected in experiment A mainly came from the central producing area of Chinese fir. The main growth traits passed the determination of general combining ability and had a high genetic improvement level. Most of the parents selected from experiment B came from the marginal producing areas of Chinese fir, Genetic improvement is low. Combining ability analysis showed that there was significant genetic difference in the growth of hybrid combinations between Chinese fir plantations, which was mainly affected by the general combining ability effect. At the individual level, the variance of general combining ability in test A was less than that of special combining ability. In experiment B The opposite. Therefore, in the genetic improvement of Chinese fir growth traits, the general combining ability and the special combining ability are of relative importance. For the materials that have been tested for the general combining ability, the determination of the special combining ability should be strengthened, while for the unmatched determination of the combining ability, Materials, the determination of general combining ability is more important than the determination of special combining ability.