Variation and genetic stability of two-year-old Liriodendron seedling growth for 39 mating combinations
In order to select the best mating combinations from three mating systems (inter-species crossing,intra-species crossing, and backcross), interspecific hybridization and heterosis (two preferred genetic improvement methods) were utilized in progeny testing of all 39 mating combinations in Liriodendron (L.chinense, L.tulipifera and L.chinese × tulipifera) to determine variation and genetic stability of growth, in terms of height and ground diameter, for two-year-old seedlings.Progeny testing at the seedling stage was implemented simultaneously in three sites, with open-pollinated offspring of Liriodendron chinense taken as the control.Also, the Eberhart and Russell analysis was used with a regression of genetic stability for the 39 combinations.Results showed that seedling growth for all 39 mating combinations was significantly greater (P＜0.01) than the control.Seedling growth from high to low was: inter-specific mating ＞ intra-specific mating ＞ backcross.No significant differences were found between progenies of reciprocal crosses with the same parents, whereas significant differences (P＜0.01) existed among combinations within the same mating types.Furthermore, the Eberhart and Russell analysis showed that mating combination J × L had good potential due to fast growth and high genetic stability, whereas BK1 × H and Z × WYS1 had fast growth but low genetic stability.Thus, to utilize the hybrid vigor within Liriodendron, selection of mating parents should be a priority consideration.
forest tree breedingLiriodendronmating combinationgenetic variationgenetic stability
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