毛白杨(Populus tomentosa carr.)为我国北方地区特有的乡土速生用材树种,具有树干通直、体型高大、寿命长、材质优、抗污染等优点,广泛应用于农村四旁造林及城市园林绿化、街道树栽植、厂矿绿化等,是广大群众喜闻乐见的优良树种之一。在北京地区,毛白杨存在着严重的种子败育现象。故欲获得大批种子,以播种的方法繁殖毛白杨将是很困难的。可是,毛白杨的枝条在温室水培条件下能夠传粉授精,並且已经观察到种子败育的主要原因在于幼胚停止发育。可以设想,在自然生长的条件下将此溫室內 Populus tomentosa carr. Is a native species of fast-growing timber native to the northern part of China. It has the advantages of straight trunk, tall body, long life, good material quality and anti-pollution. It is widely used in rural afforestation and urban landscaping. Tree planting, plant greening, etc., is one of the good tree species loved by the broad masses. In the area of ​​Beijing, Populus tomentosa there is a serious phenomenon of seed abortion. Therefore, it is very difficult to obtain a large number of seeds and to breed Populus tomentosa by sowing methods. However, the branches of Populus tomentosa can be pollinated and fertilized under greenhouse hydroponic conditions and the main reason for the abortion of seeds has been observed to be the arrest of the immature embryos. It is conceivable to place this greenhouse inside naturally grown conditions