染色体是遗传的主要物质基础。开展桑树染色体的研究,为桑树品种资源的整理、分类、演化以及桑树遗传育种,提供细胞遗传学的依据,因而是桑树育种工作中一项重要的基础研究项目。关于桑树染色体的研究,国内外均有较多的报道。广东地处亚热带,是我国四大蚕区之一,桑树资源十分丰富,经先后鉴定的有广东桑、鸡桑、长果桑、长穗桑、鬼桑、华桑等6个桑种。广东桑是一个具有发芽早,生长快,发条多,再生力强,年可多次采叶等独特性状的系 Chromosomes are the major material basis for inheritance. The study on the chromosomes of mulberry trees provides the basis of cytogenetics for the sorting, classification, evolution and mulberry genetic breeding of mulberry varieties, and is therefore an important basic research project in mulberry breeding. On the mulberry chromosome research, both at home and abroad have more reports. Guangdong is located in the subtropical zone, which is one of the four major silkworm areas in our country. Mulberry resources are very rich. There are six mulberry species of Guangdong mulberry, chicken mulberry, longan mulberry, long spike mulberry, ghost mulberry, Guangdong Sang is a germinating early, growing fast, more clockwork, strong reproductive, can be a number of unique characteristics such as leaves