北美鹅掌楸优树半同胞家系生长与形质指标变异

Liriodendron tulipifera is a deciduous large tree in the Magnoliaceae family of the Liriodendron genus.It is a great tree species for garden viewing,timber,and nectar sources.Its wood is widely used in fine woodworking products,interior decoration,building materials,plywood and other fields.After more than 20 years of introduction and domestication,the L.tulipifera has bloomed and borne fruit normally in Shandong.Multiple varieties have been cultivated,including'Yubei 1'L.tulipifera,'Yubei 2'L.tulipifera and'Yubei 3'L.tulipifera.[Objective]To reveal the variation patterns of growth and morphological indicators of half sibling families of L.tulipifera seedlings.[Method]In March 2024,twelve half sibling families of 3-year-old L.tulipifera seedlings were selected as experimental materials.Six growth and morphological indicators,including tree height,breast height diameter,branch height,branch number,first branch thickness,and first branch length,were analyzed for variance,multiple comparisons,and genetic parameter comparisons during the seedling stage.A preliminary screening was conducted to identify fast-growing and high-quality half sibling families during the seedling stage.[Result]The results showed that there was abundant variation in 6 indicators among 12 families,and the differences between indicators reached a highly significant level(P<0.01).There is a certain degree of variation in various traits among the 12 families,and the differences in indicators between some families have reached a significant level(P<0.05).According to the average coefficient of variation,the order from highest to lowest is:diameter at breast height(range of variation 26.43%-51.31%,average coefficient of variation 40.29%)>height under branches(range of variation 23.68%-53.84%,average coefficient of variation 38.72%)>number of branches(range of variation 27.99%-44.74%,average coefficient of variation 37.07%)>thickness of the first branch(range of variation 23.96%-63.80%,average coefficient of variation 36.75%)>length of the first branch(range of variation 30.02%-45.43%,average coefficient of variation 36.10%)>tree height(range of variation 14.06%-26.95%)The average coefficient of variation is 20.31%.The differences in the generalized heritability of various traits among different families reached a highly significant level.Among them,the generalized heritability of tree height was the highest(97.98%),followed by the generalized heritability of branch height,first branch length,branch number,breast height diameter,and tree height.The generalized heritability of first branch thickness was the lowest(75.60%),and the first branch thickness was greatly influenced by the environment,while other traits were greatly influenced by genetics.According to the method of adding standard deviation to the average tree height and breast height diameter,two excellent families LYZ02 and LYZ03 with rapid seedling growth were comprehensively screened.[Conclusion]The half sibling families of the L.tulipifera has good genetic improvement potential,and tree height and diameter at breast height can be important indicators for early selection during the seedling stage of the half sibling family of the L.tulipifera.