泡桐自然接干性状的遗传变异  

Genetic Variation of Paulownia's Natural Stem-Join Characters

作　　者：叶金山[1] 崔永兰[2] 杨文萍[1] 

机构地区：[1]国家林业局泡桐研究开发中心,郑州450003 [2]上海师范大学生命科学学院,上海200234

出　　处：《林业科学》2008年第3期87-93,共7页Scientia Silvae Sinicae

摘　　要：运用野外观察、田间试验和统计分析的方法研究泡桐自然接干性状的遗传变异规律。结果表明：1）自然接干性状在无性系水平上存在着广泛和明显的遗传变异;2）8个自然接干性状（接干高、全干高、主干材积、接干材积、全干材积、主干平均削度、通直度和丛枝病等级）属于高度变异型性状,其变异系数（CV）≥30,CV变幅为30.159-52.620;3）接干高性状在影响和决定其他自然接干性状的总体表现和最终状况上起着重要作用,而通直度性状在泡桐自然接干性状的遗传改良中起着至关重要的作用;4）初步提出划分泡桐自然接干类型的＂三分法＂标准并证明了连续接干类型是最好的自然接干形式;5）除通直度性状没有达到显著性差异外,其他自然接干性状都达到极显著差异;6）自然接干性状在无性系间存在极显著差异;7）很多具有胸径生长杂种优势的杂交无性系的自然接干性却很差,而有些杂交无性系既有强大的胸径速生性又有特别优良的自然接干性;8）接干材积因子、主干材积因子和主干平均削度分别为第一、第二和第三主成分。三者的累积贡献率达75.91%;9）“9501”、“9502”和“8508-2”是呈连续自然接干且自然接干性状表现最好的3个速生优质抗病优良无性系;10）简单估算了一些重要遗传参数。The genetic variation of paulownia＇s natural stem-join characters was studied by means of field observation, field test and statistical analysis. The resuhs were as follows： 1 ） Natural stem-join characters had extensive and obvious genetic variation at clone level of Paulownia. 2） Eight natural stem-join characters, which were height of stem-join, height of whole- stem, volume of main stem, volume of stem-join, volume of whole-stem, average taper of main stem, straightness of stem and witches＇ broom grade, had high variation. Their coefficient of variations （CV） were more than 30 （CV 〉 30） and the CV change range was from 30. 159 to 52.620. 3） Height of stem-join played an important role in influencing and determining total status and general expression of natural stem-join characters, straightness of stem played a vital role in genetic improvement of natural stem- join characters. 4） The paper preliminarily three classification standards about paulownia＇s natural stem-join types and proved that the continuous natural stem-join type was the most satisfactory type among all natural stem-join types. 5） The straightness of stem was not different, whereas other natural stem-join characters had extremely significant difference. 6 ） Natural stem-join characters had extremely significant difference among clones. 7） Many fast-growing hybrid clones had great heterosis in D. B. H. , but their phenotypes of natural stem-join characters were very poor. Some hybrid clones had both powerful fast growth in D. B.H. and very excellent characteristic in natural stem-join. 8） Stem-join volume factor, main stem volume factor and average taper of main stem were respectively the first main composition, the second main composition and the third main composition and their total contribution rate was 75.91% . 9） ＂9501＂, ＂9502＂ and ＂8508- 2＂ belonged to the continuous stem-join type and had good phenotypes of natural stem-join characters, fast growth and anti-witches＇ broom..10） Some im

关 键 词：泡桐 自然接干性状 遗传变异 

分 类 号：S718.46[农业科学—林学]