植物及其种子、块茎、鳞茎和插条等做为种质在国际间的调运是使一个国家的作物种类及其遗传基础多样化的一种手段被广泛采用。许多人并未意识到大多数重要的食用作物和纤维作物远非像它们今天在全世界分布得那样广泛,而实际上它们是在相当有限的地理范围内发展进化而来的。美国当地的 Plants and their seeds, tubers, bulbs and cuttings, etc. as a transport of germplasm internationally are widely used as a means of diversifying the crop species and their genetic basis in a country. Many are unaware that most of the major food crops and fiber crops are far from being as widespread as they are today in the world, and in fact they evolved within a rather limited geographical area. American local