Analysis Of Characters And Genetic Evaluation Of Family In Seedling Seed Orchard Of Pinus Massoniana

Seed orchard is a cost-efficient way to increase future forest production. In this paper, seed production, genetic gain and diversity of this orchard were analyzed. Genetic variation and correlation, heritability, as well as breeding value of growth and form traits were also studied on 70 families of masson pine( Pinus massoniana) at age 5 and 6, which as a progeny test trial of open-pollinated seeding seed orchard. The main results showed as follow:1.ANOVA showed that cone characters between families have remarkable differences. Pearson correlation coefficients among female parent traits, cone characters, seed weight of per cone and family showed that there were different degrees of correlation among these characters.2.Genetic diversity and gain of seeding seed orchard were analyzed by group co-ancestry and status number before and after rouged. The result showed the rouged scenarios at three stages are relatively reasonable.3.ANOVA showed that there were extremely significant differences among families in height, diameter of breast height(DBH), volume, crown, diameter of branch, straightness, which indicated that magnitude of genetic variation possessed among families and so have certain selection potential.4.Individual and family heritabilities of each trait were estimated respectively. The order of family heritabilities among traits at age 6 showed as follow: DBH(0.516)>stem volume(0.473)> tree height(0.409)>diameter of branch(0.383)>crown(0.378)>straightness(0.321). But relatively low values of heritabilities (individual and family) were estimated from 5 years age, the order is DBH(0.368)>tree height(0.300)>stem volume(0.276).5.Extremely significant genetic correlations were found among different traits at same year or the same trait between different years, but the straightness at age 6 should be excluded as it have insignificant correlation with other traits.6.Best linear prediction (BLP) was applied to estimate breeding values(BV) on single trait and multi-traits of families and within family individuals. According to aggregate BVs of volume from two successive years and multi-traits at age 6, this study preliminarily selected the top twenty families respectively.7.Realized genetic gains on volume were estimated. The result showed that there is 8.54% of realized gain reached and and there would be over 10% of expected volume gains reached under thirty percent of selection intensity.