油松全同胞家系苗期生长性状遗传变异研究

对来自陕西省陇县八度林场和洛南古城林场两个油松种子园的47个全同胞家系进行苗期试验,结果表明,一年生幼苗苗高、地径、子叶长度、真叶长度、下胚轴高等性状苗期表现在家系间差异显著而在家系内差异不显著;一年生幼苗地径与苗高间存在显著相关关系,真叶长度与地径和苗高均存在显著相关关系,下胚轴高与苗高存极显著相关关系,其余性状间的相关性不显著,二年生幼苗苗高与地径间仍为显著相关关系。二年生与一年生油松幼苗的苗高间存在极显著相关关系,二年生的苗高与一年生地径间也存在显著相关关系,二年生与一年生油松幼苗地径间的相关性则不显著;各性状的家系遗传力均大于单株遗传力。家系遗传力与单株遗传力由大到小的顺序均为苗高>真叶>下胚轴>地径>子叶;初步选取了D8×G3,276×52,C16×B32,B146×K60,265×16,65×305,48×230,B69×B26,44×270,66×245,D11×G8等11个优良家系。

Genetic Variations of Seedling Growth Traits among Full-sib Families of Pinus tabuleaformis

The seedlings of 47Pinus tabulaeforrnis carr full-sib families were measured and analyzed in terms of their one-year-old seedling height, ground diameter, cotyledons length, true leaf length, hypocotyls height and two-years-old seedlings height and ground diameter. The results showed that there existed significant var- iation among families in one-year-old seedling character,but in the same family there is no significant differ- ence. For one-year-old seedlings, its height is closely related to ground diameter; true leaf length is related both to seedling height and ground diameter and significant relationship between hypocotyls height and seed- ling height existed too. The two-years-old seedlings height is closely related to ground diameter too. For the relationship in different years, the seedling heights in different years are related closely but the ground diame- ters in different years had no significant relationship. Family heritability of all character is higher than single tree heritability. Family and single tree heritability in characters had a same order as seedling height 〉true leaf length 〉hypocotyls height〉ground diameter〉cotyledons length. Through comprehensive evaluation D8× G3,276X52,CI6× B32,B146 × K60,265 × 16,65 ×305,48 × 230,B69 ×B26,44 X 270,66× 245,D11 × G8 were selected as fine families.