木兰科植物的人工杂交

采用常规人工杂交方法，在木兰科中进行了68个组合杂交试验。结果表明：花粉活力随种类不同有很大差异，人工授粉后结实率很高，小孢子败育不是木兰科植物自然结实率普遍低的主要原因。木兰亚属种间杂交均表现为亲和，含笑属有些种间杂交不亲和；属间杂交多不亲和，但红元宝二乔玉兰与金叶含笑和云南含笑的杂交完全亲和，结实率高达80％～100％，表明玉兰亚属和含笑属间有较近的亲缘关系；观光木与金叶含笑、云南含笑虽有较高的杂交结实率，但杂交种子不能萌发，支持观光木属成立。

The Crossing Result of Magnoliaceae

Crossing experiments of 68 combinations within and between genera of Magnoliaceae were made in the Fairy Lake Botanical Garden based on the conventional methods of hybridization. Results revealed that the pollen vigor was various among different species. The low rate of pollen germination was not an important factor responsible for the low fruit set since owning a large number of pollens and having a high fruit set after manual crossing. The cross-compatibility commonly existed in the same genus of Magnoliaceae, except genus Magnolia (between subgenus Magnolia and Yulania). Furthermore, reproductive isolation between some species of Michelia was found. Subgenus Yulania and genus Michelia had a very close relationship, for their crossing being highly compatible and the hybrids being vigorous. Since it had reproductive isolation with Michelia, genus Tsoongiodendron should be accepted.