香椿成为一种木本蔬菜后 ,很少结种 ,从而限制了香椿苗的实生繁育 ,况且实生苗分化严重 ,不利于名优品种的推广发展 ,所以 ,无性繁育是香椿发展的有效途径。根据我们近年来对河南、河北、湖北、安徽、山西、山东、陕西、甘肃等省 8个种源 ,79个无性系的研究发现 ,越是名优品种 Toon woody vegetables become a rare species, which limits the actual breeding of Toona sinensis seedlings Moreover, the serious differentiation of seedlings is not conducive to the promotion of the development of famous varieties, so asexual breeding is an effective way for the development of Toon. According to our research on eight provenances and 79 clones in Henan, Hebei, Hubei, Anhui, Shanxi, Shandong, Shaanxi and Gansu provinces in recent years, we found that the more famous and better varieties