China is the most abundant in mulberry polyploid resources,of which 64,13,66,2 and 1 portions of natural triploid,tetraploid,hexaploid,octoploid and dicosaploid have been found, respectively.

• 我国迄今发现有天然三倍体64份,四倍体13份,六倍体66份,八倍体2份和二十二倍体1份,是桑多倍体资源最丰富的国家。