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Seed orchard production forest seed seed plantations. Compared to the scale of clonal propagation and seed breeding of improved varieties of seed orchard also has a low-cost, genetic diversity advantages, therefore, is a common way of tree seed breeding. Liriodendron hybrids wide adaptability, strong heterosis, landscaping and industrial timber construction and other fields gradually promote the use of inadequate supply of seed seedlings have become increasingly prominent contradiction therefore establish Liriodendron hybrid seed orchard imminent. In this paper, the research group early accumulation Liriodendron genus species cross-breeding and their offspring based on measured data, combined the hybrid parents SSR genetic diversity analysis, by a weighted combination of genetic gain and genetic diversity of seed orchard, OK Liriodendron Catalpa hybrid seed Park Suitable clones quantity; comprehensive examine various pro this the breeding value (generally with the force), reproductive fitness, special with the force and other indicators to determine Liriodendron hybrid seed Park's build gardens pro this; Finally, to carry out Clonal Seed Orchard system design, and select one of two programs in March 2010 -2011 April in Jurong Nanjing Forestry University, Sichuan the internship forest establish Liriodendron hybrid seed orchard. The main findings are as follows: Clonal Seed Orchard to determine the number. Jingdezhen, Jiangxi, Anhui Jing County, Xiashu Location 3 years old 34 Liriodendron half-sib Progeny Test Forest for the material as controls to estimate the average number of pedigree parental genetic gain using SSR molecular markers measure of parental genetic diversity analyze seed orchard genetic gain, genetic diversity with the trend of the number of clones, and the logistic curve fitting. Their genetic gain decreased genetic diversity increasing trend in the number of clones to 10 flatten; without coefficient amounted to 30 to flatten. Tradeoff Genetic gain and genetic diversity of seed orchard, and ultimately determine the number of clones of Liriodendron hybrid seed orchard of about 20 is appropriate. Seed orchard parents choice. Jingdezhen, Jiangxi, Anhui Jing County, Xiashu Location 75 Liriodendron mating combination Progeny Test Forest material, by analyzing the breeding values ??of the parents, the general combining ability, specific combining ability and heterosis size, and at the same time, the reference research group pre gametic selection and reproductive fitness in research results, develop Liriodendron build gardens parent selection principle: clones as female general combining ability and breeding values ??based primarily on the second to consider the female reproductive success, and finally consider specific combining ability; clones priority as the male general combining ability and breeding values ??and specific combining ability, followed by consideration of male reproductive success. Ultimately determine the 24 hybrid parents as Park built clones, wherein, wherein, Z, L, J, N2 suitable as female, L2, and BK1, XN1, C4, C5, of YY1, FY1, m, C1, and C3, SZ, S1, W, S, C2, J1, SZ1, Z is suitable as the male, N1, BM, H suitable for both the female parent and suitable as the male parent. Clonal Seed Orchard of design and construction. Liriodendron hybrid seed orchard clones design principles: (1) to avoid inbreeding; ② group with high specific combining ability of parents; (3) consider the the parents breeding value and female reproductive fitness; ④ take into account the thinning. Accordingly, the proposed five kinds of design of the Clones, and plum-type configuration and a single line single configuration two designs as Liriodendron hybrid seed orchard park construction program. Fixed anvil, March 2010 April 2011 May grafted seed orchard area of ??75 acres.
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