雌雄异株的树木,在不同性别的个体间,常表现出生物学特性的差异,如生长速率、分枝特性以及材质上的差异等。这些差异直接影响树木的经济效益。在造林及园林绿化中经常要求选择某一性别的植株,以提高林分生产率和更好地发挥美化环境的作用。此外,在林木种子园设置中,也要求雌雄个体的合理配置。由此可见,性别的早期鉴别,是生产的迫切要求。树木的幼龄期长,而此时期不开花,从形态上往往不易准确区分性别。然而,巳证明植物的性别是由基因及其表达的差异决定的。同工酶是基因表达的产物,因而有可能通过同工酶 Dioecious trees, in different genders, often show differences in biological characteristics, such as growth rate, branching characteristics, and material differences. These differences directly affect the economic benefits of trees. In afforestation and landscaping often require the selection of plants of a certain gender in order to improve stand productivity and better play the role of beautifying the environment. In addition, the installation of tree seed orchard, also requires the rational allocation of male and female individuals. This shows that the early identification of gender is an urgent requirement for production. The young age of trees is long, but this period is not flowering, from the morphological often difficult to distinguish gender accurately. However, it has been demonstrated that the sex of a plant is determined by the differences in genes and their expression. Isoenzymes are the product of gene expression and therefore may be by isozymes