| Pinus massoniana Lamb is one of the important timber trees and gum yield species in Sichuan Province, and it is also the important native trees and fast-growing commercial timber tree species in south of china because of the most widely distributed in the Pinaceae plants, biggest area of man-made forest, largest timber production. Recently, with wood-based panels, paper industry development and pine wood comprehensive utilization to improve, P. massoniana is becoming more and more important in forestry, so does the application and economic value. However, the good genetic resources were loss, on the one hand due to the current decline in the area of pine natural forest, and suffered serious damage, on the other hand the effectiveness of afforestation is seriously affected because lack of improved variety and quality. In order to change this situations, we had carried out studies on selection of Superior Provenances, good families in the natural distribution area of P. massoniana. Breeding of high yield, good quality, strong resistance lines for building high-quality, high-yield plantation base and provide high-generation seed orchard seed, and effectively save Superior Masson genetic resources, providing valuable for subsequent breeding raw materials. In this study, the state-owned Fushun half-sib progeny test forest for the study, based on the survey data of tree height, diameter, volume, crown, branches of growth and stem quality characters. Through modern breeding principles and quantitative genetic analysis, conducted genetic variation analysis, multi-trait selection comprehensive study, selected excellent provenance and families, to provide a theoretical basis for the generation of high genetic breeding. The main findings are as follows:(1) Among provenances and families variance analysis showed that the age of provenances and families of Pinus massoniana in the tree height, DBH and individual volume on a significant or very significant level, within families among individuals there are also abundant variations. crown width, height under branch, straightness, branching, high diameter ratio and fullness in differences among families was significant or very significant level, and the difference between the provenances except for the high diameter ratio was not significant. It indicated that the genetic variation of these traits in the family was rich, and the higher genetic gain could be obtained through the family selection.(2) Quantitative Genetic analysis showed that the family heritability of young forest of Pinus massoniana tree height decreases with the increase of age trends, general above 0.3, and the heritability of DBH in 6 years old reached maximum,7 to 10 years old when performance is relatively stable, and then began to have the tendency to increase with age. Crown, under branch height, height to diameter ratio and the fullness of the family heritability were about 0.5, branch, stem straightness of family heritability above 0.3, indicating massoniana traits are moderately or moderate genetic control, with a strong family selection potential.(3) Correlation analysis showed that the annual growth traits, pine family one year after the tree height (height) of each forest age and afforestation family tree high rank correlation not significant. Different Stand Age between tree height and diameter of different forest age, rank correlation coefficients were highly significant positive correlation, and with increasing stand age, the correlation coefficient between the neighboring annual increases gradually.Between phenotypic, genetic and environmental correlation analysis showed that all have relationships with different degrees of Dendrolimus families at different growth and shape quality traits, including height, diameter, strength, genetic and phenotypic correlation was between volume and mainly controlled by genetic factors. Crown, branches high, genetic and phenotypic correlation coefficients of each branch and its successful growth traits were positively correlated on the middle, where relevant, the more relevant branch crown with high growth traits and growth traits more to close, indicating that the larger crown, trees were growing better. Between a high aspect ratio and growth traits were moderate negative correlation, the correlation is mainly controlled by genetic, so choose the height to diameter ratio of masson pine families or small plant will help improve massoniana growth traits, so as to achieve the indirect selection purposes.(4) Breeding value assessment method is a relatively simple, the effect is relatively better approach. In volume breeding value of the main indicators of the three progeny test forest were elected six, three and six pedigree breeding value exceeds the overall family average breeding value of 10% of the families,3 trials were respectively selected rank in the top 10 pedigrees by Values of the high tree breeding of 1?5 a, volume breeding value of 6?12 a, under the same correct selection rate,determined 8 years is reliability early selection age.(5) Application of multi-trait selection index method Comprehensive Selection. determine I1,=0.7267X1+0.4968X2+2.4440X4;I2=0.5224X1+0.5855X2+0.4163X4; I3=0.6058X1+0.6776X2+1.0763X4 are Optimal exponential equation form quality traits. I1=0.3609X1+4.5561X2-204.3895X3+14.6741X4-1.6765X5+1.4508X6-1.9418X7+0.2375X8-201.0079X9; I2=0.8247X1+1.2279X2-28.3128X3+10.4483X4+1.3503X5+2.4803X6-1.4466X7-33.1738X8-110.8123X9; I3=-0.8409X1+4.5715X2+361.9453X3-4.9154X4+3.9876X5+0.1143X6-0.8957X7-39.0624X8+44.1286X9 are growth and quality characters shaped selection equation. An exponential equation to determine the index value pedigree, combined with tree height, diameter and volume genetic gain (integrated genetic gain> 15%), chose an excellent pedigree 21, average height, diameter and material points respectively to 13.99 m,16.91 cm and 0.1543 m3, the average genetic gains were 7.78%,12.39% and 39.64%. |
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