Liriodendron plants have been cultivated in many regions of the world for both wood production and landscape ornamentation. Hybrid Liriodendron varieties show obvious growth and resistance heterosis; thus, interspecies hybridization and heterosis utilization constitute the major breeding strategy for Liriodendron plants. Choosing superior crossing parents/combinations and predicting the heterosis of potential hybrid combinations will greatly improve breeding efficiency and accelerate the breeding process. To explore the relationships between genetic parameters and heterosis, we investigated dynamic changes in the genetic parameters of growth traits with age by testing 57 progeny combinations derived from six cross types in Liriodendron. Tree height (H) and diameter at breast height (DBH) were under intermediate to strong genetic control and varied among combinations, indicating that parent-pair selection or combination selection is feasible. Both heritability and combining ability (general combining ability, GCA; specific combining ability, SCA) changed with age, with narrow-sense heritability fluctuating greatly in the early stage and increasing in the late stage, and the combining abilities varied among combinations. Additionally, the GCA of Liriodendron chinense parents was higher than that of Liriodendron tulipifera and hybrid Liriodendron parents, and the SCA of L. tulipifera × L. chinense combinations fluctuated less than that of other combinations. Further, midparent heterosis (MPH) and SCA were significantly positively correlated, suggesting that SCA could be a suitable criterion for predicting growth heterosis. Our findings provide useful clues for selecting parent pairs/combinations and predicting heterosis, which will accelerate Liriodendron tree breeding and shed light on cross-breeding in other plants.

鹅掌d植物已在世界许多地区种植，用于木材生产和景观装饰。杂交鹅掌楸品种表现出明显的增长和性优势; 因此，种间杂交和杂种优势利用是鹅掌d植物的主要育种策略。选择优良的杂交亲本/组合并预测潜在杂种组合的杂种优势将大大提高育种效率并加快育种过程。为了探索遗传参数与杂种优势之间的关系，我们通过检测鹅掌ron六种杂交类型的57个后代组合，研​​究了生长性状的遗传参数随年龄的动态变化。。树高（H）和胸高（DBH）处于中等至强的遗传控制之下，并且在组合之间变化，这表明父母对选择或组合选择是可行的。遗传力和结合力（一般结合力，GCA；特异性结合力，SCA）都随着年龄的变化而变化，狭义的遗传力在早期波动很大，在后期增加，并且结合能力随组合而变化。此外，鹅掌parents亲本的GCA高于鹅掌and和杂种鹅掌本的GCA，以及鹅掌L ×中华。的SCA 。组合的波动小于其他组合。此外，中父母杂种优势（MPH）与SCA呈显着正相关，表明SCA可能是预测生长杂种优势的合适标准。我们的发现为选择亲本/组合和预测杂种优势提供了有用的线索，这将加快鹅掌d树的育种并阐明其他植物的杂交育种。