峦大杉引种遗传变异分析与苗期家系选优试验

Analysis on Genetic Variation of Introduced Cunninghamia konishii and Primary Selection of Seedling

利用福建省引种地的16个峦大杉优树自由授粉种子和1个对照为材料,在福建南平开展优树家系苗期试验,研究1年生苗高、地径、生物量、高径比、苗木质量指数、根幅与最粗枝径等7苗期性状遗传变异状况,分析7个苗期性状相关性并计算遗传参数,并进行家系选择。结果表明:引种地峦大杉种内有着丰富的遗传变异,优树子代间差异显著,这些变异主要由遗传物质控制,系列苗期性状的家系广义遗传力介于0.6163~0.9611之间;峦大杉苗高与地径性间无显著性相关,根幅、最粗枝径与其他性状间均无显著性相关;以苗木质量指数为选择指标,初步选择3个峦大杉优良家系;3个优良家系的平均苗高、地径、生物量、苗木质量指数和根幅分别为33.62 cm、7.19 mm、9.19 g、0.202、11.95 cm;优良家系的苗高、地径、生物量、苗木质量指数和根幅平均遗传增益达5.83%~44.57%,选择效果明显。

Using seeds of 16 opening pollinated families of plus tree and control of Cunninghamia konishii form introduced sites in Fujian Province as materials,the seedling experiment was conducted in Nanping,Fujian.Genetic variation of traits including height,ground diameter,biomass,height-diameter ratio,seedling quality index,root width and the maximum branch diameter of lateral branch of 1-year-old seedlings were studied,the correlation of 7 seedling traits was analyzed and genetic parameters were calculated,and family selection was also carried out.The results showed that there were abundant genetic variations within the C.konishii form introduced sites,and significant difference among plus tree families.The variations were mainly controlled by genetic materials.The family heritability of those seedlings traits ranged from 0.6163 to 0.9611.Correlation between seedling height to ground diameter was no significant,correlation between root width,the maximum branch diameter of lateral branch to those other seedling traits were no significant.Taking seedling quality index as the selection index,3 excellent families of C.konishii were preliminarily selected.The average seedling height,ground diameter,biomass,seedling quality index and root width of 3 excellent families were 33.62 cm,7.19 mm,9.19 g,0.202 and11.95 cm,respectively.The average genetic gain for height,ground diameter,biomass,seedling quality index,root width of excellent families ranged from 5.83%-44.57%,the selection effect was very significant.